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Legal proceedings settlement income

7,164

4,988

6,813

(900)

Operating earnings

^[2]

249,868

^[1]

210,811

^[3]

183,814

Interest expense

18,719

16,484

22,038

Charges related to refinancing

8,155

Other (income) expense, net

916

3,068

2,177

Earnings before income taxes

230,233

191,259

151,444

Income tax expense

65,275

47,292

38,018

Net earnings

164,958

143,967

113,426

Net losses attributable to noncontrolling interests

(1,550)

(36)

Net earnings attributable to EnerSys stockholders

$ 166,508

$ 144,003

$ 113,426

Net earnings per common share attributable to EnerSys stockholders:

Basic

$ 3.47

$ 2.95

$ 2.30

Diluted

$ 3.42

$ 2.93

$ 2.27

Weighted-average number of common shares outstanding:

Basic

48,022,005

48,748,205

49,376,132

Diluted

48,635,449

49,216,035

50,044,246

[1]	Included in Operating earnings were restructuring charges of $370, $1,295, $3,776 and $1,723 for the first, second, third and fourth quarters of fiscal 2013, respectively.
[2]	The Company does not allocate interest expense or other (income) expense to the reportable segments.
[3]	Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Net earnings	$ 164,958	$ 143,967	$ 113,426
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments, net of tax	(2,007)	(3,261)	9,470
Pension funded status adjustment, net of tax	(4,187)	(5,470)	1,967
Foreign currency translation adjustment	(28,894)	(32,516)	36,539
Total other comprehensive income (loss), net of tax	(35,088)	(41,247)	47,976
Total comprehensive income	129,870	102,720	161,402
Comprehensive income (loss) attributable to noncontrolling interests	(3,200)	(196)	335
Comprehensive income attributable to EnerSys stockholders	$ 133,070	$ 102,916	$ 161,067

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

Net of tax amount, before reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income	Total EnerSys Stockholders' Equity	Non- redeemable Non- controlling Interests
Beginning Balance at Mar. 31, 2010	$ 784,224	$ 504	$ 428,579	$ (19,800)	$ 303,410	$ 67,204	$ 779,897	$ 4,327
Stock-based compensation	9,056		9,056				9,056
Exercise of stock options	17,894	14	17,880				17,894
Tax benefit from stock options	6,082		6,082				6,082
Net earnings (excludes $ 1429 in 2013 and $170 in 2012 of losses attributable to redeemable noncontrolling interests)	113,426				113,426		113,426
Other comprehensive income:
Pension funded status adjustment, (net of tax benefit expense of $1,195 in 2013, $1,841 in 2012 and $794 in 2011)	1,967					1,967	1,967
Net unrealized gain (loss) on derivative instruments (net of tax benefit expense of $1,134 in 2013, $1,909 in 2012 and $5,251 in 2011)	9,470					9,470	9,470
Foreign currency translation adjustment (excludes $1,159 in 2013 and $36 in 2012 related to redeemable noncontrolling interests)	36,874					36,539	36,539	335
Ending Balance at Mar. 31, 2011	978,993	518	461,597	(19,800)	416,836	115,180	974,331	4,662
Stock-based compensation	11,585		11,585				11,585
Exercise of stock options	974	4	970				974
Tax benefit from stock options	1,772		1,772				1,772
Purchase of common stock	(58,383)			(58,383)			(58,383)
Purchase of noncontrolling interests	(1,000)		(1,000)				(1,000)
Noncontrolling interests attributable to the consolidation of fiscal 2012 acquisitions	4,020							4,020
Net earnings (excludes $ 1429 in 2013 and $170 in 2012 of losses attributable to redeemable noncontrolling interests)	144,137				144,003		144,003	134
Other comprehensive income:
Pension funded status adjustment, (net of tax benefit expense of $1,195 in 2013, $1,841 in 2012 and $794 in 2011)	(5,470)					(5,470)	(5,470)
Net unrealized gain (loss) on derivative instruments (net of tax benefit expense of $1,134 in 2013, $1,909 in 2012 and $5,251 in 2011)	(3,261)					(3,261)	(3,261)
Foreign currency translation adjustment (excludes $1,159 in 2013 and $36 in 2012 related to redeemable noncontrolling interests)	(32,552)					(32,356)	(32,356)	(196)
Ending Balance at Mar. 31, 2012	1,040,815	522	474,924	(78,183)	560,839	74,093	1,032,195	8,620
Stock-based compensation	14,737		14,737				14,737
Exercise of stock options	10,033	7	10,026				10,033
Tax benefit from stock options	1,351		1,351				1,351
Purchase of common stock	(22,593)			(22,593)			(22,593)
Purchase of noncontrolling interests	(2,131)		608				608	(2,739)
Proceeds from noncontrolling interests	613							613
Net earnings (excludes $ 1429 in 2013 and $170 in 2012 of losses attributable to redeemable noncontrolling interests)	166,387				166,508		166,508	(121)
Other comprehensive income:
Pension funded status adjustment, (net of tax benefit expense of $1,195 in 2013, $1,841 in 2012 and $794 in 2011)	(4,187)					(4,187)	(4,187)
Net unrealized gain (loss) on derivative instruments (net of tax benefit expense of $1,134 in 2013, $1,909 in 2012 and $5,251 in 2011)	(2,007)					(2,007)	(2,007)
Foreign currency translation adjustment (excludes $1,159 in 2013 and $36 in 2012 related to redeemable noncontrolling interests)	(27,735)					(27,244)	(27,244)	(491)
Ending Balance at Mar. 31, 2013	$ 1,175,283	$ 529	$ 501,646	$ (100,776)	$ 727,347	$ 40,655	$ 1,169,401	$ 5,882

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Losses attributable to redeemable noncontrolling interests	$ 1,429	$ 170
Pension funded status adjustment, tax benefit expense	1,195	1,841	$ 794
Net unrealized gain (loss) on derivative instruments, tax benefit expense	1,134	1,909	$ 5,251
Foreign currency translation adjustment, related to redeemable noncontrolling interests	$ 1,159	$ 36

Tax effect, net of reclassification adjustments, of the change in accumulated other comprehensive income (loss) related to pension and other postretirement benefit plans, attributable to the parent entity.

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Amount after tax and reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency, which is attributable to noncontrolling interests.

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Summary of Significant Accounting Policies

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net earnings	$ 164,958	$ 143,967	$ 113,426
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	50,502	50,360	44,393
Write-off of assets related to restructuring activities	3,689
Derivatives not designated in hedging relationships:
Net (gains) losses	(2,496)	1,083
Cash settlements	(851)	(3,763)
Provision for doubtful accounts	998	1,395	1,513
Deferred income taxes	1,673	(3,227)	(3,064)
Non-cash interest expense	8,492	7,983	7,776
Stock-based compensation	14,737	11,585	9,056
Write-off of deferred financing fees			2,308
Loss (gain) on disposal of fixed assets	170	(432)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	5,421	7,106	(61,892)
Inventory	(921)	(19,655)	(67,250)
Prepaid and other current assets	(15,754)	8,834	(15,658)
Other assets	3,293	(955)	(2,552)
Accounts payable	5,370	(12,377)	42,422
Accrued expenses	2,997	13,505	(3,822)
Other liabilities	2,122	(1,213)	9,803
Net cash provided by operating activities	244,400	204,196	76,459
Cash flows from investing activities
Capital expenditures	(55,286)	(48,943)	(59,940)
Purchase of businesses, net of cash acquired		(23,553)	(32,200)
Proceeds from disposal of property, plant, and equipment	194	76	479
Net cash used in investing activities	(55,092)	(72,420)	(91,661)
Cash flows from financing activities
Net increase (decrease) in short-term debt	7,435	(462)	3,084
Proceeds from revolving credit borrowings	246,050	111,550	100,000
Repayment of revolving credit borrowings	(325,450)	(132,150)
Proceeds from long-term debt-other	5,556		6,112
Payments of long-term debt-other	(16,468)	(308)	(212,238)
Deferred financing fees incurred in connection with refinancing prior credit facility			(3,500)
Capital lease obligations and other	(358)	(1,375)	(111)
Net effect from exercising of stock options and vesting of equity awards	10,033	974	17,894
Excess tax benefits from exercise of stock options and vesting of equity awards	1,351	1,772	6,082
Purchase of treasury stock	(22,593)	(58,383)
Purchase of noncontrolling interests	(2,131)	(1,000)
Proceeds from noncontrolling interests	613
Net cash used in financing activities	(95,962)	(79,382)	(82,677)
Effect of exchange rate changes on cash and cash equivalents	(4,488)	(773)	5,706
Net increase (decrease) in cash and cash equivalents	88,858	51,621	(92,173)
Cash and cash equivalents at beginning of year	160,490	108,869	201,042
Cash and cash equivalents at end of year	$ 249,348	$ 160,490	$ 108,869

Summary of Significant Accounting Policies

12 Months Ended

Mar. 31, 2013

1. Summary of Significant Accounting Policies

Description of Business

EnerSys (the “Company”) and its predecessor companies have been manufacturers of industrial batteries for over 100 years. EnerSys is a global leader in stored energy solutions for industrial applications. The Company manufactures markets and distributes industrial batteries and related products such as chargers, power equipment and battery accessories, and provides related after-market and customer-support services for industrial batteries.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries and any partially owned subsidiaries that the Company has the ability to control. Control generally equates to ownership percentage, whereby investments that are more than 50% owned are generally consolidated, investments in affiliates of 50% or less but greater than 20% are generally accounted for using the equity method, and investments in affiliates of 20% or less are accounted for using the cost method. All intercompany transactions and balances have been eliminated in consolidation.

The Company also consolidates certain subsidiaries in which the noncontrolling interest party has within its control the right to require the Company to redeem all or a portion of its interest in the subsidiary. The redeemable noncontrolling interests are reported at their estimated redemption value. Any adjustment to the redemption value impacts retained earnings but does not impact net income or comprehensive income. Noncontrolling interests which are redeemable only upon future events, the occurrence of which is not currently probable, are recorded at carrying value.

Foreign Currency Translation

Results of foreign operations are translated into U.S. dollars using average exchange rates during the periods. The assets and liabilities are translated into U.S. dollars using exchange rates as of the balance sheet dates. Gains or losses resulting from translating the foreign currency financial statements are accumulated as a separate component of accumulated other comprehensive income (“AOCI”) in EnerSys’ stockholders’ equity and noncontrolling interests.

Transaction gains and losses resulting from exchange rate changes on transactions denominated in currencies other than the functional currency of the applicable subsidiary are included in the Consolidated Statements of Income, within “Other (income) expense, net”, in the year in which the change occurs.

Revenue Recognition

The Company recognizes revenue when the earnings process is complete. This occurs when risk and title transfers, collectibility is reasonably assured and pricing is fixed and determinable. Shipment terms are either shipping point or destination and do not differ significantly between the Company’s business segments. Accordingly, revenue is recognized when risk and title are transferred to the customer. Amounts invoiced to customers for shipping and handling are classified as revenue. Taxes on revenue producing transactions are not included in net sales.

The Company recognizes revenue from the service of its reserve power and motive power products when the respective services are performed.

Accruals are made at the time of sale for sales returns and other allowances based on the Company’s historical experience.

Freight Expense

Amounts billed to customers for outbound freight costs are classified as sales in the Consolidated Statements of Income. Costs incurred by the Company for outbound freight costs to customers, inbound and transfer freight are classified in cost of goods sold.

Warranties

The Company’s products are warranted for a period ranging from one to twenty years for reserve power batteries and for a period ranging from one to seven years for motive power batteries. The Company provides for estimated product warranty expenses when the related products are sold. The assessment of the adequacy of the reserve includes a review of open claims and historical experience.

Cash and Cash Equivalents

Cash and cash equivalents include all highly liquid investments with an original maturity of three months or less when purchased.

Concentration of Credit Risk

Financial instruments that subject the Company to potential concentration of credit risk consist principally of short-term cash investments and trade accounts receivable. The Company invests its cash with various financial institutions and in various investment instruments limiting the amount of credit exposure to any one financial institution or entity. The Company has bank deposits that exceed federally insured limits. In addition, certain cash investments may be made in U.S. and foreign government bonds, or other highly rated investments guaranteed by the U.S. or foreign governments. Concentration of credit risk with respect to trade receivables is limited by a large, diversified customer base and its geographic dispersion. The Company performs ongoing credit evaluations of its customers’ financial condition and requires collateral, such as letters of credit, in certain circumstances.

Accounts Receivable

The Company maintains allowances for doubtful accounts for estimated losses resulting from the inability of customers to make required payments. The allowance is based on management’s estimate of uncollectible accounts, analysis of historical data and trends, as well as reviews of all relevant factors concerning the financial capability of its customers. Accounts receivable are considered to be past due based on how payments are received compared to the customer’s credit terms. Accounts are written off when management determines the account is uncollectible.

Inventories

Inventories are stated at the lower of cost or market. Cost is determined using the first-in, first-out (FIFO) method. The cost of inventory consists of material, labor, and associated overhead.

Property, Plant, and Equipment

Property, plant, and equipment are recorded at cost and include expenditures that substantially increase the useful lives of the assets. Depreciation is provided using the straight-line method over the estimated useful lives of the assets as follows: 10 to 33 years for buildings and improvements and 3 to 15 years for machinery and equipment.

Maintenance and repairs are expensed as incurred. Interest on capital projects is capitalized during the construction period.

Business Combinations

The purchase price of an acquired company is allocated between tangible and intangible assets acquired and liabilities assumed from the acquired business based on their estimated fair values, with the residual of the purchase price recorded as goodwill. The results of operations of the acquired businesses are included in the Company’s operating results from the dates of acquisition.

Goodwill and Other Intangible Assets

Goodwill and indefinite-lived trademarks are tested for impairment at least annually and whenever events or circumstances occur indicating that a possible impairment may have been incurred. Goodwill is tested for impairment by determining the fair value of the Company’s reporting units. These estimated fair values are based on financial projections, certain cash flow measures, and market capitalization. The indefinite-lived trademarks are tested for impairment by comparing the carrying value to the fair value based on current revenue projections of the related operations, under the relief from royalty method. Any excess carrying value over the amount of fair value is recognized as impairment. Any impairment would be recognized in full in the reporting period in which it has been identified.

Finite-lived assets such as customer relationships, patents, and non-compete agreements are amortized over their estimated useful lives, generally over periods ranging from 3 to 20 years. The Company reviews the carrying values of these assets for possible impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable based on undiscounted estimated cash flows expected to result from its use and eventual disposition. The Company continually evaluates the reasonableness of the useful lives of these assets.

Impairment of Long-Lived Assets

The Company reviews the carrying values of its property and equipment for possible impairment whenever events or changes in circumstances indicate that the carrying value of an asset may not be recoverable based on undiscounted estimated cash flows expected to result from its use and eventual disposition. The factors considered by the Company in performing this assessment include current operating results, trends and other economic factors. In assessing the recoverability of the carrying value of the property and equipment, the Company must make assumptions regarding future cash flows and other factors. If these estimates or the related assumptions change in the future, the Company may be required to record an impairment loss for these assets.

Environmental Expenditures

The Company records a loss and establishes a reserve for environmental remediation liabilities when it is probable that an asset has been impaired or a liability exists and the amount of the liability can be reasonably estimated. Reasonable estimates involve judgments made by management after considering a broad range of information including: notifications, demands or settlements that have been received from a regulatory authority or private party, estimates performed by independent engineering companies and outside counsel, available facts existing and proposed technology, the identification of other potentially responsible parties, their ability to contribute and prior experience. These judgments are reviewed quarterly as more information is received and the amounts reserved are updated as necessary. However, the reserves may materially differ from ultimate actual liabilities if the loss contingency is difficult to estimate or if management’s judgments turn out to be inaccurate. If management believes no best estimate exists, the minimum probable loss is accrued.

Derivative Financial Instruments

The Company utilizes derivative instruments to mitigate volatility related to interest rates, lead prices and foreign currency exposures. The Company does not hold or issue derivative financial instruments for trading or speculative purposes. The Company recognizes derivatives as either assets or liabilities in the accompanying Consolidated Balance Sheets and measures those instruments at fair value. Changes in the fair value of those instruments are reported in AOCI if they qualify for hedge accounting or in earnings if they do not qualify for hedge accounting. Derivatives qualify for hedge accounting if they are designated as hedge instruments and if the hedge is highly effective in achieving offsetting changes in the fair value or cash flows of the asset or liability hedged. Effectiveness is measured on a regular basis using statistical analysis and by comparing the overall changes in the expected cash flows on the lead and foreign currency forward contracts with the changes in the expected all-in cash outflow required for the lead and foreign currency purchases. This analysis is performed on the initial purchases quarterly that cover the quantities hedged. Accordingly, gains and losses from changes in derivative fair value of effective hedges are deferred and reported in AOCI until the underlying transaction affects earnings.

The Company has commodity, foreign exchange and interest rate hedging authorization from the Board of Directors and has established a hedging and risk management program that includes the management of market and counterparty risk. Key risk control activities designed to ensure compliance with the risk management program include, but are not limited to, credit review and approval, validation of transactions and market prices, verification of risk and transaction limits, portfolio stress tests, sensitivity analyses and frequent portfolio reporting, including open positions, determinations of fair value and other risk management metrics.

Market risk is the potential loss the Company and its subsidiaries may incur as a result of price changes associated with a particular financial or commodity instrument. The Company utilizes forward contracts, and swaps as part of its risk management strategies, to minimize unanticipated fluctuations in earnings caused by changes in commodity prices, interest rates and/or foreign currency exchange rates. All derivatives are recognized on the balance sheet at their fair value, unless they qualify for Normal Purchase Normal Sale.

Credit risk is the potential loss the Company may incur due to the counterparty’s non-performance. The Company is exposed to credit risk from interest rate, foreign currency and commodity derivatives with financial institutions. The Company has credit policies to manage their credit risk, including the use of an established credit approval process, monitoring of the counterparty positions and the use of master netting agreements.

The Company has elected to offset net derivative positions under master netting arrangements. The Company does not have any positions involving cash collateral (payables or receivables) under a master netting arrangement as of March 31, 2013 and 2012.

The Company does not have any credit-related contingent features associated with its derivative instruments.

Fair Value of Financial Instruments

The fair value of the Company’s cash and cash equivalents, accounts receivable and accounts payable approximate carrying value due to their short maturities.

The fair value of the Company’s $350,000 senior secured revolving credit facility (“2011 Credit Facility”), the 75,000 Chinese Renminbi (“RMB”) credit facility (“China Term Loan”), the 273,780 Indian Rupee (“INR”) term loan (“India Term Loan”) and short-term debt approximate their carrying value, as they are variable rate debt and the terms are comparable to market terms as of the balance sheet dates and are classified as Level 2.

The fair value amounts of the Company’s $172,500 senior unsecured 3.375% convertible notes (“Convertible Notes”) represent the trading values of the Convertible Notes which is based upon quoted market prices and are classified as Level 2.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). The Company and its subsidiaries use, as appropriate, a market approach (generally, data from market transactions), an income approach (generally, present value techniques and option-pricing models), and/or a cost approach (generally, replacement cost) to measure the fair value of an asset or liability. These valuation approaches incorporate inputs such as observable, independent market data and/or unobservable data that management believes are predicated on the assumptions market participants would use to price an asset or liability. These inputs may incorporate, as applicable, certain risks such as nonperformance risk, which includes credit risk.

Lead contracts, foreign currency contracts and interest rate contracts generally use an income approach to measure the fair value of these contracts, utilizing readily observable inputs, such as forward interest rates (e.g., London Interbank Offered Rate—“LIBOR”) and forward foreign currency exchange rates (e.g., GBP and euro) and commodity prices (e.g., London Metals Exchange), as well as inputs that may not be observable, such as credit valuation adjustments. When observable inputs are used to measure all or most of the value of a contract, the contract is classified as Level 2. Over-the-counter (OTC) contracts are valued using quotes obtained from an exchange, binding and non-binding broker quotes. Furthermore, the Company obtains independent quotes from the market to validate the forward price curves. OTC contracts include forwards, swaps and options. To the extent possible, fair value measurements utilize various inputs that include quoted prices for similar contracts or market-corroborated inputs.

When unobservable inputs are significant to the fair value measurement, a contract is classified as Level 3. The Company did not have any Level 3 positions at March 31, 2013 or March 31, 2012. Additionally, Level 2 fair value measurements include adjustments for credit risk based on the Company’s own creditworthiness (for net liabilities) and its counterparties’ creditworthiness (for net assets). The Company assumes that observable market prices include sufficient adjustments for liquidity and modeling risks. The Company did not have any contracts that transferred between Level 2 and Level 3 as well as Level 1 and Level 2.

Income Taxes

The Company accounts for income taxes in accordance with the Financial Accounting Standards Board (“FASB”) guidance, which requires deferred tax assets and liabilities be recognized using enacted tax rates to measure the effect of temporary differences between book and tax bases on recorded assets and liabilities. FASB guidance also requires that deferred tax assets be reduced by a valuation allowance, if it is more likely than not some portion or all of the deferred tax assets will not be recognized.

The Company evaluates on a quarterly basis its ability to realize deferred tax assets by assessing its valuation allowance and by adjusting the amount of such allowance, if necessary. The factors used to assess the likelihood of realization are forecasts of future taxable income and available tax planning strategies that could be implemented to realize the net deferred tax assets.

In accordance with FASB guidance on accounting for uncertainty in income taxes, the Company evaluates tax positions to determine whether the benefits of tax positions are more likely than not of being sustained upon audit based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained upon audit, the Company recognizes the largest amount of the benefit that is greater than 50% likely of being realized upon ultimate settlement. For tax positions that are not more likely than not of being sustained upon audit, the Company does not recognize any portion of the benefit. If the more likely than not threshold is not met in the period for which a tax position is taken, the Company may subsequently recognize the benefit of that tax position if the tax matter is effectively settled, the statute of limitations expires, or if the more likely than not threshold is met in a subsequent period.

Deferred Financing Fees

Debt issuance costs that are incurred by the Company in connection with the issuance of debt are deferred and amortized to interest expense over the life of the underlying indebtedness, adjusted to reflect any early repayments.

Retirement Plans

The Company accounts for retirement plans in accordance with FASB guidance on employers’ accounting for defined benefit pension plans, which requires an entity to recognize in its statement of financial position an asset for a defined benefit postretirement plan’s overfunded status or a liability for a plan’s underfunded status, and to measure a defined benefit postretirement plan’s assets and obligations that determine its funded status as of the balance sheet date.

The Company uses certain assumptions in the calculation of the actuarial valuations of its defined benefit plans. These assumptions include discount rate, rates of increase in compensation levels and expected long-term rates of return of plan assets. If actual results are less favorable than those projected by the Company, additional expense may be required.

Stock-Based Compensation Plans

The Company measures the cost of employee services received in exchange for the award of an equity instrument based on the grant-date fair value of the award, with such cost recognized over the applicable vesting period.

Market Share Units

The fair value of the market share units is estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate, dividend yield, time to maturity and expected volatility. These units vest and are settled in common stock on the third anniversary of the date of grant. Market share units are converted into between zero and two shares of common stock for each unit granted at the end of a three-year performance cycle. The conversion ratio is calculated by dividing the average closing share price of the Company’s common stock during the ninety calendar days immediately preceding the vesting date by the average closing share price of the Company’s common stock during the ninety calendar days immediately preceding the grant date, with the resulting quotient capped at two. This quotient is then multiplied by the number of market share units granted to yield the number of shares of common stock to be delivered on the vesting date. The Company recognizes compensation expense using the straight-line method over the life of the market share units.

Restricted Stock Units

The fair value of restricted stock units is based on the closing market price of the Company’s common stock on the date of grant. These awards generally vest, and are settled in common stock, at 25% per year, over a four-year period from the date of grant. The Company recognizes compensation expense using the straight-line method over the life of the restricted stock units.

Stock Options

The fair value of the options granted is estimated at the date of grant using the Black-Scholes option-pricing model utilizing assumptions based on historical data and current market data. The assumptions include expected term of the options, risk-free interest rate, expected volatility, and dividend yield. The expected term represents the expected amount of time that options granted are expected to be outstanding, based on historical and forecasted exercise behavior. The risk-free rate is based on the rate at the grant date of zero-coupon U.S. Treasury Notes with a term equal to the expected term of the option. Expected volatility is estimated using historical volatility rates based on historical weekly price changes. The Company’s dividend yield is based on historical data. The Company recognizes compensation expense using the straight-line method over the vesting period of the options.

Earnings Per Share

Basic earnings per common share (“EPS”) are computed by dividing net earnings attributable to EnerSys stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted into common stock. At March 31, 2013, 2012 and 2011, the Company had outstanding stock options, restricted stock units, market share units and Convertible Notes, which could potentially dilute basic earnings per share in the future.

Segment Reporting

FASB guidance defines that a segment for reporting purposes is based on the financial performance measures that are regularly reviewed by the chief operating decision maker to assess segment performance and to make decisions about a public entity’s allocation of resources. Based on this guidance, the Company reports its segment results based upon the three geographical regions of operations.

•

Americas, which includes North and South America, with segment headquarters in Reading, Pennsylvania, USA,

•

EMEA, which includes Europe, the Middle East and Africa, with segment headquarters in Zurich, Switzerland, and

•

Asia, which includes Asia, Australia and Oceania, with segment headquarters in Singapore.

New Accounting Pronouncements

In June 2011, the FASB issued ASU No. 2011-05, “Comprehensive Income (Topic 220): Presentation of Comprehensive Income” requiring entities to present net income and other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements and eliminated the option to present components of other comprehensive income as part of the statement of shareholders’ equity. This guidance became effective for the Company in the first quarter of fiscal 2013 and did not have an impact on its financial statements other than the change in presentation.

In February 2013, the FASB finalized the disclosure requirements on how entities should present financial information about reclassification adjustments from accumulated other comprehensive income in ASU No. 2013-02, “Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income”. The standard requires that companies present either in a single note or parenthetically on the face of the financial statements, the effect of significant amounts reclassified from each component of accumulated other comprehensive income based on its source and the income statement line items affected by the reclassification. If a component is not required to be reclassified to net income in its entirety, companies would instead cross-reference to the related footnote for additional information. The disclosures required by this amendment are effective for public entities for fiscal years and interim periods within those years beginning after December 15, 2012.

Use of Estimates

The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. Actual results could differ from those estimates.

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

Acquisitions

12 Months Ended

Mar. 31, 2013

Acquisitions

2. Acquisitions

In fiscal 2012, the Company completed the following four acquisitions with a combined net purchase price of $23,553, using cash on hand.

The Company obtained a controlling financial interest in Powertech Batteries (which is a part of Allied Electronics Corporation Limited (Altron)), in South Africa to produce and market batteries for industrial applications which would serve both reserve power and motive power customers across sub-Saharan Africa, including South Africa.

The Company obtained a controlling financial interest in EAS Germany GmbH, to produce large format lithium-ion battery cells with GAIA Akkumulatorenwerke GmbH (“GAIA”), a wholly owned subsidiary of Lithium Technology Corporation (“LTC”).

The Company obtained a controlling financial interest in Energy Leader Batteries India Limited in India to serve both reserve and motive power customers in India.

The Company also acquired Industrial Battery Holding S.A., the parent company of EnerSystem, a market leader in the South American motive power and reserve power battery markets, with headquarters in Buenos Aires, Argentina and with manufacturing plants in Argentina and Brazil as well as operations in Chile.

The Company finalized purchase accounting for these acquisitions in fiscal 2013. These adjustments in the aggregate were not significant to the financial statements.

The Company acquired intangible assets, in connection with each of the fiscal 2012 acquisitions, including trademarks, customer relationships, technology and goodwill. Trademarks were valued at $2,000, non-compete agreements at $500, customer relationships at $3,400 and technology at $4,265. Customer relationships, non-compete agreements and technology were assigned finite useful lives and amortization is recorded over the economic life of the intangibles. Goodwill relating to these acquisitions was recorded at $16,764.

The results of these acquisitions have been included in the Company’s results of operations from the dates of their respective acquisitions. Pro forma earnings per share computations have not been presented as these acquisitions are not considered material.

In fiscal 2011, the Company made three acquisitions, the most significant of which was the acquisition of the lithium-ion battery business, ABSL Power Solutions Ltd (“ABSL”), which was completed on February 28, 2011. The purchase price paid for these transactions, net of cash received, was $32,200 and was financed using cash on hand. The Company acquired intangible assets, in connection with the ABSL acquisition, including trademarks, customer relationships, technology and goodwill. Trademarks were valued at $1,774, customer relationships at $3,547 and technology at $2,741. Customer relationships and technology were assigned finite useful lives and amortization is recorded over the economic life of the intangibles. Goodwill relating to the acquisition of ABSL was recorded at $15,342.

These acquisitions and investments provide the Company with an expanded geographic presence and advanced technology products for use in high integrity applications in telecommunications, utilities, rail, material handling and mining, as well as other sectors.

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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Property, Plant, and Equipment

Inventories

12 Months Ended

Mar. 31, 2013

Inventories

3. Inventories

Net inventories consist of:


	March 31,
	2013		2012
Raw materials	$	88,787	$	100,538
Work-in-process		113,119		111,629
Finished goods		152,035		149,607

Total	$	353,941	$	361,774

Inventory reserves for obsolescence and other estimated losses, mainly relating to finished goods, were $17,372 and $14,831 at March 31, 2013 and 2012, respectively, and have been included in the net amounts shown above.

Property, Plant, and Equipment

12 Months Ended

Mar. 31, 2013

4. Property, Plant, and Equipment

Property, plant, and equipment consist of:


	March 31,
	2013			2012
Land, buildings, and improvements	$	206,610		$	201,038
Machinery and equipment		528,546			511,599
Construction in progress		25,139			29,779

		760,295			742,416
Less accumulated depreciation		(410,169	)		(389,201	)

Total	$	350,126		$	353,215

Depreciation expense for the fiscal years ended March 31, 2013, 2012 and 2011 totaled $47,876, $48,532, and $43,517, respectively. Interest capitalized in connection with major construction projects amounted to $619, $797, and $1,292 for the fiscal years ended March 31, 2013, 2012 and 2011, respectively.

The entire disclosure for long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software. This disclosure may include property plant and equipment accounting policies and methodology, a schedule of property, plant and equipment gross, additions, deletions, transfers and other changes, depreciation, depletion and amortization expense, net, accumulated depreciation, depletion and amortization expense and useful lives, income statement disclosures, assets held for sale and public utility disclosures.

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

12 Months Ended

Mar. 31, 2013

5. Goodwill and Other Intangible Assets

Information regarding the Company’s other intangible assets are as follows:


	March 31,
	2013							2012
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Indefinite-lived intangible assets:
Trademarks	$	86,298	$	(953	)	$	85,345	$	86,745	$	(953	)	$	85,792
Finite-lived intangible assets:
Customer relationships		14,016		(3,994	)		10,022		14,330		(2,839	)		11,491
Non-compete		2,558		(1,524	)		1,034		2,602		(1,224	)		1,378
Patents		5,383		(1,237	)		4,146		5,230		(615	)		4,615
Trademarks		2,004		(727	)		1,277		2,003		(643	)		1,360
Licenses		2,527		(650	)		1,877		2,640		(194	)		2,446

Total	$	112,786	$	(9,085	)	$	103,701	$	113,550	$	(6,468	)	$	107,082

The Company’s amortization expense related to finite-lived intangible assets was $2,626, $1,828, and $876, for the years ended March 31, 2013, 2012 and 2011, respectively. The expected amortization expense based on the finite-lived intangible assets as of March 31, 2013, is $2,160 in 2014, $2,045 in 2015, $2,013 in 2016, $1,799 in 2017 and $1,432 in 2018.

The changes in the carrying amount of goodwill by reportable segment are as follows:


	Fiscal year ended March 31, 2013
	EMEA			Americas			Asia			Total
Balance at beginning of year	$	173,442		$	150,754		$	28,541		$	352,737
Adjustments related to the finalization of purchase accounting for fiscal 2012 acquisitions		155			230			(20	)		365
Foreign currency translation adjustment		(6,889	)		(953	)		239			(7,603	)

Balance at end of year	$	166,708		$	150,031		$	28,760		$	345,499


	Fiscal year ended March 31, 2012
	EMEA			Americas			Asia		Total
Balance at beginning of year	$	177,881		$	143,225		$	22,560	$	343,666
Goodwill acquired during the year		3,164			7,973			5,262		16,399
Adjustments related to the finalization of purchase accounting for fiscal 2011 acquisitions		374			5			—		379
Foreign currency translation adjustment		(7,977	)		(449	)		719		(7,707	)

Balance at end of year	$	173,442		$	150,754		$	28,541	$	352,737

During fiscal 2013, the Company retroactively adjusted the fair value of the redeemable noncontrolling interests by approximately $5,676 relating to the Powertech Batteries and Energy Leader Batteries India Limited acquisitions and increased the corresponding goodwill associated with these transactions as of March 31, 2012. In addition, the Company adjusted nonredeemable noncontrolling interests by an amount of $4,106 to properly account for the redeemable noncontrolling interests.

The Company estimated tax-deductible goodwill to be approximately $10,444 and $12,745 as of March 31, 2013 and 2012, respectively.

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

Prepaid and Other Current Assets

Prepaid and Other Current Assets

12 Months Ended

Mar. 31, 2013

6. Prepaid and Other Current Assets

Prepaid and other current assets consist of the following:


	March 31,
	2013		2012
Prepaid non-income taxes	$	27,525	$	23,737
Prepaid income taxes		16,145		7,716
Non-trade receivables		6,096		8,247
Other		14,053		12,693

Total	$	63,819	$	52,393

Accrued Expenses

12 Months Ended

Mar. 31, 2013

Accrued Expenses

7. Accrued Expenses

Accrued expenses consist of the following:


	March 31,
	2013		2012
Payroll and benefits	$	52,484	$	55,595
Accrued selling expenses		28,896		26,269
Warranty		20,079		19,274
Income taxes payable		19,273		16,979
Freight		11,768		12,314
VAT and other non-income taxes		10,438		10,966
Deferred income		7,789		12,057
Lead forward contracts		2,832		—
Interest		2,171		2,040
Pension and social security		1,787		1,696
Restructuring		1,959		1,186
Interest rate swaps		654		3,628
Other		31,534		26,399

Total	$	191,664	$	188,403

Debt

12 Months Ended

Mar. 31, 2013

Debt

8. Debt

Summary of Long-Term Debt

The following summarizes the Company’s long-term debt:


	March 31,
	2013		2012
3.375% Convertible Notes, net of discount, due 2038	$	155,273	$	148,272
2011 Credit Facility due 2016		—		79,400
China Term Loan due 2017		—		6,034
India Term Loan due 2017		—		5,383
Other		—		40

		155,273		239,129
Less current portion		—		2,540

Total long-term debt	$	155,273	$	236,589

2011 Senior Secured Revolving Credit Facility

On March 29, 2011, the Company entered into a $350,000 senior secured revolving credit facility (“2011 Credit Facility”). The 2011 Credit Facility matures on March 31, 2016. This facility includes an early termination provision under which the Company is required to meet a liquidity test in February 2015 related to its capacity to meet certain potential obligations related to the Convertible Notes in June 2015. Borrowings under the 2011 Credit Facility bear interest at a floating rate based, at the Company’s option, upon (i) LIBOR plus an applicable percentage (currently 1.25%), (ii) the greater of the Federal Funds rate plus 0.50% or the prime rate, or one-month LIBOR plus 1.0%, plus an applicable percentage (currently 0.25%). There are no prepayment penalties on loans under the 2011 Credit Facility. There was no balance outstanding as of March 31, 2013.

Obligations under the 2011 Credit Facility are secured by substantially all of the Company’s existing and future acquired assets, including substantially all of the capital stock of the Company’s United States subsidiaries that are guarantors under the credit facility, and 65% of the capital stock of certain of the Company’s foreign subsidiaries that are owned by the Company’s United States companies.

China Term Loan

During the fourth quarter of fiscal 2011, the Company completed the financing of the China Term Loan. This was a six-year term loan to provide a portion of the capital requirements for the Company’s operations in China. This term loan was paid in full during the fourth quarter of fiscal 2013.

India Term Loan

During the fourth quarter of fiscal 2012, the Company obtained a controlling financial interest in Energy Leader Batteries India Limited in India. The Company assumed the India Term Loan at the date of acquisition. The loan was paid in full during the third quarter of fiscal 2013 and was replaced with a short-term borrowing. The amount outstanding as of March 31, 2013, on the short-term borrowings was $15,077.

Senior Unsecured 3.375% Convertible Notes

On May 28, 2008, the Company completed a registered offering of $172,500 aggregate principal amount of senior unsecured 3.375% Convertible Notes Due 2038 (“Convertible Notes”) (see prospectus and supplemental indenture dated May 28, 2008). The Company received net proceeds of $168,200 after the deduction of commissions and offering expenses. The Company used all of the net proceeds to repay a portion of its then existing senior secured credit facility.

The Convertible Notes are general senior unsecured obligations and rank equally with the Company’s existing and future senior unsecured obligations and are junior to any of the Company’s future secured obligations to the extent of the value of the collateral securing such obligations. The Convertible Notes are not guaranteed, and are structurally subordinate in right of payment to, all of the (i) existing and future indebtedness and other liabilities of the Company’s subsidiaries and (ii) preferred stock of the Company’s subsidiaries to the extent of their respective liquidation preferences.

The Convertible Notes require the semi annual payment of interest in arrears on June 1 and December 1 of each year beginning December 1, 2008, at 3.375% per annum on the principal amount outstanding. The Convertible Notes will accrete principal beginning on June 1, 2015 and will bear contingent interest, if any, beginning with the six-month interest period commencing on June 1, 2015 under certain circumstances. The Convertible Notes will mature on June 1, 2038. Prior to maturity, the holders may convert their Convertible Notes into shares of the Company’s common stock at any time after March 1, 2015 or prior to that date under certain circumstances. When issued, the initial conversion rate was 24.6305 shares per $1,000 principal amount of Convertible Notes, which was equivalent to an initial conversion price of $40.60 per share. It is the Company’s current intent to settle the principal amount of any conversions in cash, and any additional conversion consideration in cash, shares of EnerSys common stock or a combination of cash and shares. The Convertible Notes will mature on June 1, 2038, unless earlier converted, redeemed or repurchased.

At any time after June 6, 2015, the Company may at its option redeem the Convertible Notes, in whole or in part, for cash, at a redemption price equal to 100% of the principal amount of Convertible Notes to be redeemed, plus any accrued and unpaid interest. A holder of Convertible Notes may require the Company to repurchase some or all of the holder’s Convertible Notes for cash upon the occurrence of a fundamental change as defined in the indenture and on each of June 1, 2015, 2018, 2023, 2028 and 2033 at a price equal to 100% of the principal amount of the Convertible Notes being repurchased, plus accrued and unpaid interest, if any, in each case. If applicable, the Company will pay a make-whole premium on Convertible Notes converted in connection with certain fundamental changes that occur prior to June 6, 2015. The amount of the make-whole premium, if any, will be based on the Company’s stock price and the effective date of the fundamental change. The indenture contains a detailed description of how the make-whole premium will be determined and a table showing the make-whole premium that would apply at various stock prices. No make-whole premium would be paid if the price of the Common Stock on the effective date of the fundamental change is less than $29.00. Any make-whole premium will be payable in shares of Common Stock (or the consideration into which the Company’s Common Stock has been exchanged in the fundamental change) on the conversion date for the Convertible Notes converted in connection with the fundamental change.

The Convertible Notes were issued in an offering registered under the Securities Act of 1933, as amended (“Securities Act”).

In accordance with FASB guidance on the accounting for convertible debt instruments that may be settled in cash upon conversion (including partial settlement), the liability and equity components are separated in a manner that will reflect the entity’s non-convertible debt borrowing rate when interest expense is recognized in subsequent periods.

The following represents the principal amount of the liability component, the unamortized discount, and the net carrying amount of our Convertible Notes as of March 31, 2013 and 2012, respectively:


	March 31, 2013			March 31, 2012
Principal	$	172,500		$	172,500
Unamortized discount		(17,227	)		(24,228	)

Net carrying amount	$	155,273		$	148,272

Carrying amount of equity component	$	29,850		$	29,850

As of March 31, 2013, the remaining discount will be amortized over a period of 26 months. The conversion price of the $172,500 in aggregate principal amount of the Convertible Notes is $40.60 per share and the number of shares on which the aggregate consideration to be delivered upon conversion is 4,248,761.

The effective interest rate on the liability component of the Convertible Notes was 8.50%. The amount of interest cost recognized for the amortization of the discount on the liability component of the Convertible Notes was $7,001, $6,435 and $5,917, respectively, for the fiscal years ended March 31, 2013, 2012 and 2011.

As of March 31, 2013 and 2012, the Company had available and undrawn, under all its lines of credit, $469,123 and $377,230, respectively. Included in the March 31, 2013 and 2012 amounts are $120,373 and $95,340, respectively, of uncommitted lines of credit.

The Company paid $10,056, $8,933 and $16,101, net of interest received, for interest during the fiscal years ended March 31, 2013, 2012 and 2011, respectively.

The Company’s financing agreements contain various covenants, which, absent prepayment in full of the indebtedness and other obligations, or the receipt of waivers, would limit the Company’s ability to conduct certain specified business transactions including incurring debt, mergers, consolidations or similar transactions, buying or selling assets out of the ordinary course of business, engaging in sale and leaseback transactions, paying dividends and certain other actions. The Company is in compliance with all such covenants.

Short-Term Debt

As of March 31, 2013 and 2012, the Company had $22,702 and $16,042, respectively, of short-term borrowings from banks. The weighted-average interest rates on these borrowings were approximately 9% for each of the fiscal years ended March 31, 2013 and 2012.

Letters of Credit

As of March 31, 2013 and 2012, the Company had $11,854 and $9,108, respectively, of standby letters of credit outstanding under the 2011 Credit Facility and other credit arrangements.

Deferred Financing Fees

In fiscal 2011, in connection with the refinancing of the Company’s previous credit facility, the Company wrote off $2,308 of unamortized deferred financing fees associated with the previous Credit Facility, and incurred $3,500 in new deferred financing fees.

Deferred financing fees, net of accumulated amortization, totaled $3,355 and $4,634 as of March 31, 2013 and 2012, respectively. Amortization expense, relating to deferred financing fees, included in interest expense was $1,279, $1,278, and $1,861 for the fiscal years ended March 31, 2013, 2012 and 2011, respectively.

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

Leases

12 Months Ended

Mar. 31, 2013

Leases

9. Leases

The Company’s future minimum lease payments under capital and operating leases that have noncancelable terms in excess of one year as of March 31, 2013 are as follows:


	Capital Leases		Operating Leases
2014	$	330	$	19,433
2015		130		14,129
2016		48		10,312
2017		27		6,793
2018		14		4,714
Thereafter		—		8,606

Total minimum lease payments		549	$	63,987

Amounts representing interest		34

Net minimum lease payments, including current portion of $311	$	515

Rental expense was $33,090, $31,619, and $28,047 for the fiscal years ended March 31, 2013, 2012 and 2011, respectively. Amortization of capitalized leased assets is included in depreciation expense. Certain operating lease agreements contain renewal or purchase options and/or escalation clauses.

The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

Fair Value of Financial Instruments

Other Liabilities

12 Months Ended

Mar. 31, 2013

Other Liabilities

10. Other Liabilities

Other liabilities consist of the following:


	March 31,
	2013		2012
Pension and profit sharing obligation	$	34,554	$	30,752
Warranty		22,512		22,793
Long-term income taxes liabilities		17,165		13,520
Deferred income		6,285		6,094
Interest rate swap liabilities		—		244
Other		9,902		19,065

Total	$	90,418	$	92,468

Fair Value of Financial Instruments

12 Months Ended

Mar. 31, 2013

11. Fair Value of Financial Instruments

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company uses the following valuation techniques to measure fair value for its financial assets and financial liabilities:


Level 1		Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2		Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.

Level 3		Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

The following tables represent the financial assets and (liabilities), measured at fair value on a recurring basis as of March 31, 2013 and March 31, 2012 and the basis for that measurement:


	Total Fair Value Measurement March 31, 2013			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(654	)	$	—	$	(654	)	$	—
Lead forward contracts		(2,832	)		—		(2,832	)		—
Foreign currency forward contracts		(11	)		—		(11	)		—

Total derivatives	$	(3,497	)	$	—	$	(3,497	)	$	—


	Total Fair Value Measurement March 31, 2012			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(3,872	)	$	—	$	(3,872	)	$	—
Lead forward contracts		(851	)		—		(851	)		—
Foreign currency forward contracts		782			—		782			—

Total derivatives	$	(3,941	)	$	—	$	(3,941	)	$	—

The fair values of interest rate swap agreements are based on observable prices as quoted for receiving the variable three-month LIBOR and paying fixed interest rates and, therefore, were classified as Level 2.

The fair values of lead forward contracts are calculated using observable prices for lead as quoted on the London Metal Exchange (“LME”) and, therefore, were classified as Level 2.

The fair values for foreign currency forward contracts are based upon current quoted market prices and are classified as Level 2 based on the nature of the underlying market in which these derivatives are traded.

Financial Instruments

The fair values of the Company’s cash and cash equivalents accounts receivable and accounts payable approximate carrying value due to their short maturities.

The fair values of the Company’s 2011 Credit Facility, the China Term Loan, the India Term Loan and short-term debt approximate their carrying value, as they are variable rate debt and the terms are comparable to market terms as of the balance sheet dates. The China Term Loan and the India Term Loan were repaid in full as of March 31, 2013.

The Convertible Notes, with a face value of $172,500, were issued when the Company’s stock price was trading at $30.19 per share. On March 31, 2013, the Company’s stock price closed at $45.58 per share. The Convertible Notes have a conversion option at $40.60 per share. The fair value of these notes represent the trading values based upon quoted market prices and are classified as Level 2. The Convertible Notes were trading at 126% of face value on March 31, 2013, and 116% of face value on March 31, 2012.

The carrying amounts and estimated fair values of the Company’s derivatives and Convertible Notes at March 31, 2013 and 2012 were as follows:


	March 31, 2013						March 31, 2012
	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Financial assets:
Derivatives⁽¹⁾	$	241		$	241		$	812		$	812

Financial liabilities:
Convertible Notes	$	155,273	⁽²⁾	$	217,350	⁽³⁾	$	148,272	⁽²⁾	$	200,100	⁽³⁾
Derivatives⁽¹⁾		3,738			3,738			4,753			4,753

(1)

Represents interest rate swap agreements, lead and foreign currency hedges (see Note 12 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at March 31, 2013 and March 31, 2012).

(2)

The carrying amounts of the Convertible Notes at March 31, 2013 and March 31, 2012 represent the $172,500 principal value, less the unamortized debt discount (see Note 8).

(3)

The fair value amounts of the Convertible Notes represent the trading values of the Convertible Notes with a principal value of $172,500 at March 31, 2013 and March 31, 2012.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15B
-Subparagraph a, b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44A, 44B
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 159
-Paragraph 17-22, 27, 28
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15A
-Subparagraph a-d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 15C, 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 157
-Paragraph 32, 33, 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 3, 10, 14, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Derivative Financial Instruments

Derivative Financial Instruments

12 Months Ended

Mar. 31, 2013

12. Derivative Financial Instruments

The Company utilizes derivative instruments to reduce its exposure to commodity price, foreign exchange risks and interest rates, under established procedures and controls. The Company does not enter into derivative contracts for speculative purposes. The Company’s agreements are with creditworthy financial institutions and the Company anticipates performance by counterparties to these contracts and therefore no material loss is expected.

Derivatives in Cash Flow Hedging Relationships

Lead Hedge Forward Contracts

The Company enters into lead hedge forward contracts to fix the price for a portion of lead purchases. Management considers the lead hedge forward contracts to be effective against changes in the cash flows of the underlying lead purchases. The vast majority of such contracts are for a period not extending beyond one year and the notional amounts at March 31, 2013 and 2012 were 56.3 million pounds and 60.0 million pounds, respectively.

Foreign Currency Forward Contracts

The Company purchases lead and other commodities in certain countries where the foreign currency exposure is different from the functional currency of that country. The Company uses foreign currency forward contracts to hedge a portion of the Company’s foreign currency exposures for lead as well as well as other foreign currency exposures so that gains and losses on these contracts offset changes in the underlying foreign currency denominated exposures. The vast majority of such contracts are for a period not extending beyond one year. As of March 31, 2013 and 2012, the Company had entered into a total of $51,366 and $42,121, respectively, of such contracts.

In the coming twelve months, the Company anticipates that $1,389 of pretax loss relating to lead and foreign currency forward contracts will be reclassified from AOCI as part of cost of goods sold. This amount represents the current unrealized impact of hedging lead and foreign exchange rates, which will change as market rates change in the future, and will ultimately be realized in the income statement as an offset to the corresponding actual changes in lead costs to be realized in connection with the variable lead cost and foreign exchange rates being hedged.

Derivatives not Designated in Hedging Relationships

Interest Rate Swap Agreements

As of March 31, 2013 and March 31, 2012, the Company maintained interest rate swap agreements that converted $65,000 and $85,000, respectively, of variable-rate debt to a fixed-rate basis, utilizing the three-month LIBOR, as a floating rate reference. These agreements, which expired in May 2013, no longer qualified for hedge accounting at the end of fiscal 2011 as a result of the refinancing of the Company’s previous credit facility. The Company recorded expense relating to changes in the fair value of these agreements in the Consolidated Statements of Income, within other (income) expense, net of $101 and $977 during fiscal 2013 and 2012, respectively. In fiscal 2011, the changes in the fair value of these agreements were recorded in AOCI.

Foreign Currency Forward Contracts

The Company also enters into foreign currency forward contracts to economically hedge foreign currency fluctuations on intercompany loans and foreign currency denominated receivables and payables. These are not designated as hedging instruments and changes in fair value of these instruments are recorded directly in the Consolidated Statements of Income. As of March 31, 2013 and 2012, the notional amount of these contracts was $21,749 and $11,410, respectively. The Company recorded (income) expense in the Consolidated Statements of Income within other (income) expense, net of ($2,597) and $106 during fiscal 2013 and 2012, respectively. There were no such contracts in fiscal 2011.

Presented below in tabular form is information on the location and amounts of derivative fair values in the Consolidated Balance Sheets and derivative gains and losses in the Consolidated Statements of Income:

Fair Value of Derivative Instruments

March 31, 2013 and 2012


	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging Instruments
	March 31, 2013		March 31, 2012		March 31, 2013		March 31, 2012
Prepaid and other current assets
Foreign currency forward contracts	$	—	$	670	$	241	$	112
Other assets
Lead hedge forward contracts		—		30		—		—

Total assets	$	—	$	700	$	241	$	112

Accrued expenses
Interest rate swap agreements	$	—	$	—	$	654	$	3,628
Lead hedge forward contracts		2,832		881		—		—
Foreign currency forward contracts		252		—		—		—
Other liabilities
Interest rate swap agreements		—		—		—		244

Total liabilities	$	3,084	$	881	$	654	$	3,872

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ended March 31, 2013


Derivatives Designated as Cash Flow Hedges	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)		Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead hedge forward contracts	$	1,623	Cost of goods sold	$	3,309
Foreign currency forward contracts		248	Cost of goods sold		1,703

Total	$	1,871		$	5,012


Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Other (income) expense, net	$	(101	)
Foreign currency forward contracts	Other (income) expense, net		2,597

Total		$	2,496

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ended March 31, 2012


Derivatives Designated as Cash Flow Hedges	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead hedge forward contracts	$	(9,731	)	Cost of goods sold	$	(831	)
Foreign currency forward contracts		(152	)	Cost of goods sold		(3,882	)

Total	$	(9,883	)		$	(4,713	)


Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Other (income) expense, net	$	(977	)
Foreign currency forward contracts	Other (income) expense, net		(106	)

Total		$	(1,083	)

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ended March 31, 2011


Derivatives in a Cash Flow Hedging Relationship	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Interest rate swap contracts	$	(2,835	)	Interest expense	$	(6,698	)
Lead hedge forward contracts		15,930		Cost of goods sold		6,417
Foreign currency forward contracts		(4,031	)	Cost of goods sold		471

Total	$	9,064			$	190

The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items.

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Reference 22: http://www.xbrl.org/2003/role/presentationRef
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Income Taxes

12 Months Ended

Mar. 31, 2013

Income Taxes

13. Income Taxes

Income tax expense is composed of the following:


	Fiscal year ended March 31,
	2013			2012			2011
Current:
Federal	$	38,480		$	30,459		$	24,232
State		5,684			3,778			2,736
Foreign		19,438			16,282			14,114

Total current		63,602			50,519			41,082
Deferred:
Federal		3,915			(1,609	)		(1,358	)
State		214			(962	)		2,010
Foreign		(2,456	)		(656	)		(3,716	)

Total deferred		1,673			(3,227	)		(3,064	)

Income tax expense	$	65,275		$	47,292		$	38,018

Earnings before income taxes consists of the following:


	Fiscal year ended March 31,
	2013		2012		2011
United States	$	107,191	$	87,597	$	57,710
Foreign		123,042		103,662		93,734

Earnings before income taxes	$	230,233	$	191,259	$	151,444

Income taxes paid by the Company for the fiscal years ended March 31, 2013, 2012 and 2011 were $64,210, $38,482 and $41,800, respectively.

The following table sets forth the tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities:


	March 31,
	2013			2012
Deferred tax assets:
Accounts receivable	$	660		$	1,111
Inventories		4,345			6,707
Net operating loss carryforwards		67,834			71,773
Accrued expenses		32,773			26,997
Other assets		9,703			10,228

Gross deferred tax assets		115,315			116,816
Less valuation allowance		(54,542	)		(56,359	)

Total deferred tax assets		60,773			60,457
Deferred tax liabilities:
Property, plant and equipment		28,985			30,957
Other intangible assets		48,142			46,628
Convertible Notes		22,386			21,616
Other liabilities		865			2,400

Total deferred tax liabilities		100,378			101,601

Net deferred tax liabilities	$	(39,605	)	$	(41,144	)

The Company has approximately $3,213 in United States federal net operating loss carryforwards, all of which are limited by Section 382 of the Internal Revenue Code, that begin to expire in the year ending 2023. The Company has approximately $235,623 of net operating loss carryforwards at March 31, 2013 that relate to the Company’s foreign subsidiaries. Some of these net operating loss carryforwards have an unlimited life, while others expire at various times over the next 20 years. In addition, the Company also had approximately $35,751 of net operating loss carryforwards for state tax purposes that expire at various times over the next 20 years.

During the current fiscal year, the Company reversed a valuation allowance against certain federal net operating losses that were limited by Section 382. The amount of the valuation allowance reversal was $793. The Company has also recorded a valuation allowance for net deferred tax assets in certain foreign and state tax jurisdictions, primarily related to net operating loss carryforwards, due to the significant losses incurred in these tax jurisdictions. As of March 31, 2013 and 2012 the valuation allowance associated with certain foreign tax jurisdictions was $52,781 and $53,206, respectively. As of March 31, 2013 and 2012 the valuation allowance associated with the state tax jurisdictions was $1,761 and $2,360, respectively. During the fiscal years ended March 31, 2013 and 2012, the Company recorded tax benefits of $1,866 and $2,940, respectively, due to the utilization of net operating loss carryforwards in certain foreign subsidiaries.

A reconciliation of income taxes at the statutory rate to the income tax provision is as follows:


	Fiscal year ended March 31,
	2013			2012			2011
United States statutory income tax expense (at 35%)	$	80,581		$	66,962		$	53,005
Increase (decrease) resulting from:
State income taxes, net of federal effect		3,742			1,592			3,035
Nondeductible expenses, domestic manufacturing deduction and other		7,664			1,587			(1,848	)
Effect of foreign operations		(27,883	)		(20,028	)		(14,841	)
Valuation allowance		1,171			(2,821	)		(1,333	)

Income tax expense	$	65,275		$	47,292		$	38,018

The effective income tax rate was 28.4% in fiscal 2013, compared to 24.7% in fiscal 2012 and 25.1% in fiscal 2011.

At March 31, 2013, the Company has not recorded United States income or foreign withholding taxes on approximately $598,500 of undistributed earnings of foreign subsidiaries that could be subject to taxation if remitted to the United States because the Company currently plans to keep these amounts permanently invested overseas. It is not practical to calculate the income tax expense that would result upon repatriation of these earnings.

The Company recognizes and measures uncertain tax positions taken, or expected to be taken, in a tax return in accordance with FASB guidance on accounting for uncertainty in income taxes.

A reconciliation of the beginning and ending amount of unrecognized tax benefits under FASB guidance is as follows:


March 31, 2010	$	10,750
Increases related to current year tax positions		2,896
Increases related to prior year tax positions		324
Increases related to prior year tax positions due to foreign currency translation		122
Decreases related to prior year tax position settled		(3,145	)
Lapse of statute of limitations		(302	)

March 31, 2011		10,645
Increases related to current year tax positions		5,032
Increases related to prior year tax positions		182
Decreases related to prior year tax positions due to foreign currency translation		(28	)
Lapse of statute of limitations		(2,886	)

March 31, 2012		12,945
Increases related to current year tax positions		6,296
Increases related to prior year tax positions		969
Increases related to prior year tax positions due to foreign currency translation		245
Lapse of statute of limitations		(3,970	)

March 31, 2013	$	16,485

All of the balance of unrecognized tax benefits at March 31, 2013 and 2012, if recognized, would be included in the Company’s Consolidated Statements of Income and have a favorable impact on both the Company’s net earnings and effective tax rate.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, and various states and foreign jurisdictions. With few exceptions, the Company is no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2009.

The Company anticipates that it is reasonably possible that a portion of the March 31, 2013 balance of the unrecognized tax benefits could be recognized within the next twelve months due to the expiration of the relevant statutes of limitations. An estimate of the range of the adjustments cannot be made at this time.

The Company recognizes tax related interest and penalties in income tax expense in its Consolidated Statements of Income. As of March 31, 2013 and 2012, the Company had an accrual of $680 and $575, respectively, for interest and penalties.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

Retirement Plans

12 Months Ended

Mar. 31, 2013

Retirement Plans

14. Retirement Plans

Defined Benefit Plans

The Company provides retirement benefits to substantially all eligible salaried and hourly employees. The Company uses a measurement date of March 31 for its pension plans.

Net periodic pension cost for fiscal 2013, 2012 and 2011, includes the following components:


	United States Plans									International Plans
	Fiscal year ended March 31,									Fiscal year ended March 31,
	2013			2012			2011			2013			2012			2011
Service cost	$	349		$	285		$	250		$	679		$	645		$	603
Interest cost		649			668			646			2,377			2,504			2,503
Expected return on plan assets		(756	)		(706	)		(624	)		(1,851	)		(1,787	)		(1,615	)
Amortization and deferral		393			238			248			209			32			53

Net periodic benefit cost	$	635		$	485		$	520		$	1,414		$	1,394		$	1,544

The following table sets forth a reconciliation of the related benefit obligation, plan assets, and accrued benefit costs related to the pension benefits provided by the Company for those employees covered by defined benefit plans:


	United States Plans						International Plans
	March 31,						March 31,
	2013			2012			2013			2012
Change in projected benefit obligation
Benefit obligation at the beginning of the period	$	14,040		$	11,903		$	53,895		$	48,881
Service cost		349			285			679			645
Interest cost		649			668			2,377			2,504
Benefits paid, inclusive of plan expenses		(664	)		(615	)		(1,667	)		(1,709	)
Plan settlements		—			—			—			(40	)
Experience loss		1,537			1,799			7,099			5,442
Foreign currency translation adjustment		—			—			(2,507	)		(1,828	)

Benefit obligation at the end of the period	$	15,911		$	14,040		$	59,876		$	53,895


	United States Plans						International Plans
	March 31,						March 31,
	2013			2012			2013			2012
Change in plan assets
Fair value of plan assets at the beginning of the period	$	9,192		$	8,746		$	26,942		$	25,779
Actual return on plan assets		843			420			4,024			1,555
Employer contributions		963			641			1,639			1,505
Benefits paid, inclusive of plan expenses		(664	)		(615	)		(1,667	)		(1,709	)
Plan settlements		—			—			—			(40	)
Foreign currency translation adjustment		—			—			(1,470	)		(148	)

Fair value of plan assets at the end of the period	$	10,334		$	9,192		$	29,468		$	26,942

Funded status deficit	$	(5,577	)	$	(4,848	)	$	(30,408	)	$	(26,953	)


	March 31,
	2013			2012
Amounts recognized in the consolidated balance sheets consist of:
Other assets	$	—		$	260
Accrued expenses		(1,431	)		(1,309	)
Other liabilities		(34,554	)		(30,752	)

	$	(35,985	)	$	(31,801	)

The following table represents pension components (before tax) and related changes (before tax) recognized in AOCI for the Company’s pension plans for the years ended March 31, 2013, 2012 and 2011:


	Fiscal year ended March 31,
	2013			2012			2011
Amounts recorded in AOCI before taxes:
Prior service cost	$	(816	)	$	(922	)	$	(1,054	)
Net loss		(16,645	)		(11,176	)		(3,712	)

Net amount recognized	$	(17,461	)	$	(12,098	)	$	(4,766	)


	Fiscal year ended March 31,
	2013			2012			2011
Changes in plan assets and benefit obligations:
New prior service cost	$	—		$	—		$	905
Net loss (gain) arising during the year		6,376			7,757			(3,505	)
Effect of exchange rates on amounts included in AOCI		(392	)		(176	)		151
Amounts recognized as a component of net periodic benefit costs:
Amortization of prior service cost		(79	)		(83	)		(62	)
Amortization or settlement recognition of net loss		(523	)		(187	)		(250	)

Total recognized in other comprehensive income	$	5,382		$	7,311		$	(2,761	)

The amounts included in AOCI as of March 31, 2013 that are expected to be recognized as components of net periodic pension cost during the fiscal year ended March 31, 2014 are as follows:


Net loss	$	(866	)
Prior service cost		(78	)

Net amount expected to be recognized	$	(944	)

The accumulated benefit obligation related to all defined benefit pension plans and information related to unfunded and underfunded defined benefit pension plans at the end of each year are as follows:


	United States Plans				International Plans
	March 31,				March 31,
	2013		2012		2013		2012
All defined benefit plans:
Accumulated benefit obligation	$	15,911	$	14,040	$	56,135	$	50,416
Unfunded defined benefit plans:
Projected benefit obligation		—		—		28,444		26,892
Accumulated benefit obligation		—		—		27,032		25,508
Defined benefit plans with a projected benefit obligation in excess of the fair value of plan assets:
Projected benefit obligation	$	15,911	$	14,040	$	59,876	$	28,003
Accumulated benefit obligation		15,911		14,040		56,135		26,445
Fair value of plan assets		10,334		9,192		29,468		789
Defined benefit plans with an accumulated benefit obligation in excess of the fair value of plan assets:
Projected benefit obligation	$	15,911	$	14,040	$	29,571	$	28,003
Accumulated benefit obligation		15,911		14,040		27,985		26,445
Fair value of plan assets		10,334		9,192		777		789

Assumptions

Significant assumptions used to determine the net periodic benefit cost for the US and International plans were as follows:


	United States Plans									International Plans
	Fiscal year ended March 31,									Fiscal year ended March 31,
	2013			2012			2011			2013			2012			2011
Discount rate		4.8	%		5.7	%		6.0	%		2.5-5.5	%		4.0-5.5	%		4.3-6.0	%
Expected return on plan assets		8.0			8.0			8.0			5.5-7.0			5.5-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			N/A			2.0-4.0			2.0-4.0			2.0-3.5

Significant assumptions used to determine the projected benefit obligations for the US and International plans were as follows:


	United States Plans						International Plans
	March 31,						March 31,
	2013			2012			2013			2012
Discount rate		4.0	%		4.8	%		2.5-4.4	%		2.5-5.5	%
Expected return on plan assets		8.0			8.0			4.0-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			2.0-4.0			2.0-4.0

N/A = not applicable

The United States plans do not include compensation in the formula for determining the pension benefit as it is based solely on years of service.

The expected long-term rate of return for the Company’s pension plan assets is based upon the target asset allocation and is determined using forward looking assumptions in the context of historical returns and volatilities for each asset class, as well as correlations among asset classes. The Company evaluates the rate of return assumptions for each of its plans on an annual basis.

Pension Plan Investment Strategy

The Company’s investment policy emphasizes a balanced approach to investing in securities of high quality and ready marketability. Investment flexibility is encouraged so as not to exclude opportunities available through a diversified investment strategy.

Equity investments are maintained within a target range of 50%-70% of the total portfolio market value. Investments in debt securities include issues of various maturities, and the average quality rating of bonds should be investment grade with a minimum quality rating of “B” at the time of purchase.

The Company periodically reviews the asset allocation of its portfolio. The proportion committed to equities, debt securities and cash and cash equivalents is a function of the values available in each category and risk considerations. The plan’s overall return will be compared to and expected to meet or exceed established benchmark funds and returns over a three to five year period.

The objectives of the Company’s investment strategies are: (a) the achievement of a reasonable long-term rate of total return consistent with an emphasis on preservation of capital and purchasing power, (b) stability of annual returns through a portfolio risk level, which is appropriate to conservative accounts, and (c) reflective of the Company’s willingness to forgo significantly above-average rewards in order to minimize above-average risks. These objectives may not be met each year but should be attained over a reasonable period of time.

The following table represents our pension plan investments measured at fair value as of March 31, 2013 and 2012 and the basis for that measurement:


	March 31, 2013
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset category:
Cash and cash equivalents	$	1,454	$	1,454	$	—	$	—	$	—	$	—	$	—	$	—
Equity securities
US^(a)		5,346		5,346		—		—		2,856		2,856		—		—
International^(b)		905		905		—		—		15,617		15,617		—		—
Fixed income^(c)		2,629		2,629		—		—		10,995		10,995		—		—

Total	$	10,334	$	10,334	$	—	$	—	$	29,468	$	29,468	$	—	$	—


	March 31, 2012
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset category:
Cash and cash equivalents	$	868	$	868	$	—	$	—	$	—	$	—	$	—	$	—
Equity securities
US^(a)		5,067		5,067		—		—		2,742		2,742		—		—
International^(b)		837		837		—		—		14,728		14,728		—		—
Fixed income^(c)		2,420		2,420		—		—		9,472		9,472		—		—

Total	$	9,192	$	9,192	$	—	$	—	$	26,942	$	26,942	$	—	$	—

The fair values presented above were determined based on valuation techniques categorized as follows:

Level 1

Inputs are unadjusted quoted prices in active markets for identical assets or liabilities.

Level 2

Inputs are quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable and market-corroborated inputs which are derived principally from or corroborated by observable market data.

Level 3

Inputs are derived from valuation techniques in which one or more significant inputs or value drivers are unobservable.

(a)

US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.

(b)

International equities are invested in companies that are traded on exchanges outside the U.S. and are well diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.

(c)

Fixed income consists primarily of investment grade bonds from diversified industries.

The Company expects to make cash contributions of approximately $2,226 to its pension plans in fiscal year 2014.

Estimated future benefit payments under the Company’s pension plans are as follows:


	Pension Benefits
2014	$	2,486
2015		2,253
2016		2,464
2017		2,888
2018		2,872
Years 2019-2023		17,519

Defined Contribution Plan

The Company maintains defined contribution plans primarily in the U.S. and U.K. Eligible employees can contribute a portion of their pre-tax and /or after-tax income in accordance with plan guidelines and the Company will make contributions based on the employees’ eligible pay and /or will match a percentage of the employee contributions up to certain limits. Matching contributions charged to expense for the fiscal years ended March 31, 2013, 2012 and 2011 were $5,191, $5,146 and $5,025, respectively.

The entire disclosure for pension and other postretirement benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Implementation Guide (Q and A)
-Number FAS88
-Paragraph 63
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 03-2
-Paragraph 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph q
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 8
-Subparagraph m
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS106-2
-Paragraph 20, 21, 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 30
-Paragraph 26
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Stockholders' Equity and Noncontrolling Interests

Stockholders' Equity and Noncontrolling Interests

12 Months Ended

Mar. 31, 2013

15. Stockholders’ Equity and Noncontrolling Interests

Preferred Stock and Common Stock

The Company’s certificate of incorporation authorizes the issuance of up to 1,000,000 shares of preferred stock, par value $0.01 per share (“Preferred Stock”). At March 31, 2013 and 2012, no shares of Preferred Stock were issued or outstanding. The Board of Directors of the Company has the authority to specify the terms of any Preferred Stock at the time of issuance.

The following demonstrates the change in the number of shares of common stock outstanding during fiscal years ended March 31, 2011, 2012 and 2013, respectively:


Shares outstanding as of March 31, 2010	48,581,832
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	1,452,521

Shares outstanding as of March 31, 2011	50,034,353
Purchase of treasury stock	(2,646,885	)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	412,661

Shares outstanding as of March 31, 2012	47,800,129
Purchase of treasury stock	(683,192	)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	723,267

Shares outstanding as of March 31, 2013	47,840,204

Treasury Stock

In fiscal 2013 and 2012, the Company purchased 683,192 shares of its common stock for $22,593 and 2,646,885 shares for $58,383, respectively. At March 31, 2013 and 2012, the Company held 5,130,077 and 4,446,885 shares as treasury stock.

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income are as follows:


	Beginning Balance			Before-Tax Amount			Tax Benefit (Expense)			Net-of-Tax Amount			Ending Balance
March 31, 2013
Pension funded status adjustment	$	(8,982	)	$	(5,382	)	$	1,195		$	(4,187	)	$	(13,169	)
Net unrealized gain (loss) on derivative instruments		1,175			(3,141	)		1,134			(2,007	)		(832	)
Foreign currency translation adjustment		81,900			(27,244	)		—			(27,244	)		54,656

Accumulated other comprehensive income	$	74,093		$	(35,767	)	$	2,329		$	(33,438	)	$	40,655

March 31, 2012
Pension funded status adjustment	$	(3,512	)	$	(7,311	)	$	1,841		$	(5,470	)	$	(8,982	)
Net unrealized gain (loss) on derivative instruments		4,436			(5,170	)		1,909			(3,261	)		1,175
Foreign currency translation adjustment		114,256			(32,356	)		—			(32,356	)		81,900

Accumulated other comprehensive income	$	115,180		$	(44,837	)	$	3,750		$	(41,087	)	$	74,093

March 31, 2011
Pension funded status adjustment	$	(5,479	)	$	2,761		$	(794	)	$	1,967		$	(3,512	)
Net unrealized gain (loss) on derivative instruments		(5,034	)		14,721			(5,251	)		9,470			4,436
Foreign currency translation adjustment		77,717			36,539			—			36,539			114,256

Accumulated other comprehensive income	$	67,204		$	54,021		$	(6,045	)	$	47,976		$	115,180

Noncontrolling Interests

During fiscal 2013, the Company acquired the remaining 40% of noncontrolling interest of EAS Germany GmbH previously owned by GAIA Akkumulatorenwerke GmbH (“GAIA”), a wholly owned subsidiary of Lithium Technology Corporation (“LTC”) for $2,131. The noncontrolling interest related to the fiscal 2012 acquisition of EAS Germany GmbH.

Redeemable Noncontrolling Interests

During fiscal 2012, the Company acquired a controlling financial interest in Powertech Batteries and Energy Leader Batteries India Limited (Note 2). The minority partners of both Powertech Batteries and Energy Leader Batteries India Limited have options exercisable to require the redemption of the shares owned by them, which if exercised, would make the Company the sole owner of these entities. The noncontrolling interests in both of these entities are reported by the Company as redeemable noncontrolling interests and classified as mezzanine equity (temporary equity) on the Consolidated Balance Sheets. The redeemable noncontrolling interests are reported at their estimated redemption value.

The following demonstrates the change in redeemable noncontrolling interests during the fiscal years ended March 31, 2012 and 2013, respectively:


Balance as of March 31, 2011	$	—
Redeemable noncontrolling interests recognized in acquisitions of Powertech Batteries and Energy Leader Batteries India Limited		9,916
Net losses attributable to redeemable noncontrolling interests		(170	)
Foreign currency translation adjustment		36

Balance as of March 31, 2012	$	9,782
Net losses attributable to redeemable noncontrolling interests		(1,429	)
Loan to equity conversion by redeemable noncontrolling interests		3,901
Foreign currency translation adjustment		(1,159	)

Balance as of March 31, 2013	$	11,095

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 310
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-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section B
-Paragraph 7, 11A
-Chapter 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Stock-Based Compensation

12 Months Ended

Mar. 31, 2013

Stock-Based Compensation

16. Stock-Based Compensation

As of March 31, 2013, the Company maintains the EnerSys 2010 Equity Incentive Plan (“2010 EIP”). The 2010 EIP reserved 3,177,477 shares of common stock for the grant of various classes of nonqualified stock options, restricted stock units, market share units and other forms of equity-based compensation. Shares subject to any awards that expire without being exercised or that are forfeited or settled in cash shall again be available for future grants of awards under the 2010 EIP. Shares subject to awards that have been retained by the Company in payment or satisfaction of the exercise price and any applicable tax withholding obligation of an award shall not count against the limit described above.

As of March 31, 2013, 2,452,522 shares are available for future grants. The Company’s management equity incentive plans are intended to provide an incentive to employees and non-employee directors of the Company to remain in the service of the Company and to increase their interest in the success of the Company in order to promote the long-term interests of the Company. The plans seek to promote the highest level of performance by providing an economic interest in the long-term performance of the Company. The Company settles employee share-based compensation awards with newly issued shares.

Stock Options

No non-qualified stock options were granted during the last three fiscal years. Options generally expire 10 years from the date of grant.

For fiscal 2013, 2012 and 2011, the Company recognized $97 ($69 net of taxes), $1,092 ($822 net of taxes) and $2,333 ($1,844 net of taxes), respectively, of stock-based compensation expense associated with stock option grants.

The following table summarizes the Company’s stock option activity in the years indicated:


	Number of Options			Weighted- Average Remaining Contract Term (Years)		Weighted- Average Exercise Price		Aggregate Intrinsic Value
Options outstanding as of March 31, 2010		2,431,233			4.0	$	17.69	$	19,191
Exercised		(1,415,391	)				15.34		18,482
Canceled		(155,063	)				29.32		9

Options outstanding as of March 31, 2011		860,779			6.2	$	19.52	$	17,129
Exercised		(227,116	)				15.82		3,691

Options outstanding as of March 31, 2012		633,663			6.1	$	20.85	$	8,879
Exercised		(555,677	)				21.70		8,860

Options outstanding and exercisable as of March 31, 2013		77,986			2.5	$	14.76	$	2,404

The following table summarizes information regarding stock options outstanding, all of which are also exercisable, as of March 31, 2013:


	Options Outstanding and Exercisable
Range of Exercise Prices	Number of Options		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price
$10.01-$15.00		65,954		2.1	$	14.12
$15.01-$30.19		12,032		4.1		18.29

		77,986		2.5	$	14.76

A summary of the status of the Company’s non-vested options as of March 31, 2013, and changes during fiscal 2013, is presented below:


	Number of Options			Weighted- Average Grant-Date Fair Value
Nonvested at March 31, 2012		110,037		$	7.87
Vested		(110,037	)		7.87

Nonvested at March 31, 2013		—		$	—

Restricted Stock Units and Market Share Units

In fiscal 2013, the Company granted to non-employee directors 21,328 deferred restricted stock units at the fair value of $37.51 per restricted stock unit at the date of grant. In fiscal 2012, such grants amounted to 35,632 restricted stock units at the fair value of $22.45 per restricted stock unit at the date of grant. The fiscal 2012 and 2013 awards vested immediately upon the date of grant and the payment of shares of common stock under this grant are payable upon such director’s termination of service as a director. In fiscal 2011, the Company granted to non-employee directors 21,248 restricted stock units at the market price of $22.59 per restricted stock unit at the date of grant. These restricted stock units vested in thirteen months following the date of grant.

In fiscal 2013, 2012 and 2011, the Company granted 9,412, 9,340 and 2,792 restricted stock units, respectively, at various fair values, under deferred compensation plans.

In fiscal 2013, the Company granted to management and other key employees 199,139 restricted stock units at the fair value of $31.76 per restricted stock unit and 303,942 market share units at a weighted average fair value of $41.36 per market share unit at the date of grant. The fair value of the market share units granted in fiscal 2013 was estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate of 0.37%, dividend yield of zero, time to maturity of 3 years and expected volatility of 39.08%.

In fiscal 2012, the Company granted to management and other key employees 95,026 restricted stock units at the fair value of $35.79 per restricted stock unit at the date of grant and 224,397 market share units at the fair value of $48.36 per market share unit at the date of grant. The fair value of the market share units granted in fiscal 2012 was estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate of 0.93%, dividend yield of zero, time to maturity of 3 years and expected volatility of 45.5%.

In fiscal 2011, the Company granted to management and other key employees 291,701 restricted stock units at the fair value of $25.67 per restricted stock unit at the date of grant and 124,091 market share units at the fair value of $34.45 per market share unit at the date of grant. The fair value of the market share units granted in fiscal 2011was estimated at the date of grant using a binomial lattice model with the following assumptions: a risk-free interest rate of 1.30%, dividend yield of zero, time to maturity of 3 years and expected volatility of 43.0%.

A summary of the changes in restricted stock units and market share units awarded to employees and directors that were outstanding under the Company’s equity compensation plans during fiscal 2013 is presented below:


	Restricted Stock Units (RSU)					Market Share Units (MSU)
	Number of RSU			Weighted- Average Grant Date Fair Value		Number of MSU			Weighted- Average Grant Date Fair Value
Non-vested awards as of March 31, 2012		617,240		$	24.61		346,563		$	43.38
Granted		229,879			31.23		303,942			41.36
Vested		(238,320	)		23.99		—			—
Canceled		(6,693	)		32.01		(20,466	)		46.77

Non-vested awards as of March 31, 2013		602,106		$	27.30		630,039		$	42.29

The Company recognized stock-based compensation expense relating to restricted stock units and market share units of approximately $14,640, with a related tax benefit of $4,105 for fiscal 2013, $10,493, with a related tax benefit of $2,599 for fiscal 2012 and $6,723, with a related tax benefit of $1,659 for fiscal 2011.

All Award Plans

As of March 31, 2013, unrecognized compensation expense associated with the non-vested incentive awards outstanding was $22,941 and is expected to be recognized over a weighted-average period of nineteen months.

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666

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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph 64, 65, A240
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Statement of Position (SOP)
-Number 93-6
-Paragraph 53
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Commitments, Contingencies and Litigation

Earnings Per Share

12 Months Ended

Mar. 31, 2013

Earnings Per Share

17. Earnings Per Share

The following table sets forth the reconciliation from basic to diluted weighted-average number of common shares outstanding and the calculations of net earnings per common share attributable to EnerSys stockholders.


	March 31,
	2013		2012		2011
Net earnings attributable to EnerSys stockholders	$	166,508	$	144,003	$	113,426

Weighted-average number of common shares outstanding:
Basic		48,022,005		48,748,205		49,376,132
Dilutive effect of:
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired		593,422		467,830		668,114
Convertible Notes		20,022		—		—

Diluted weighted-average number of common shares outstanding		48,635,449		49,216,035		50,044,246

Basic earnings per common share attributable to EnerSys stockholders	$	3.47	$	2.95	$	2.30

Diluted earnings per common share attributable to EnerSys stockholders	$	3.42	$	2.93	$	2.27

Anti-dilutive equity awards not included in diluted weighted-average common shares		—		221,097		—

The aggregate number of shares that the Company could be obligated to issue upon conversion of its $172,500 Convertible Notes which the Company issued in May 2008, is approximately 4,248,761. It is the Company’s current intent to settle the principal amount of any conversions in cash, and any additional conversion consideration in cash, shares of EnerSys common stock or a combination of cash and shares. During the fourth quarter of fiscal 2013, the average price of our common stock at $41.38 per share exceeded the conversion price of $40.60 per share on the Convertible Notes. 20,022 shares relating to the conversion premium ($41.38-$40.60) on the Convertible Notes were included in the diluted earnings per share using the treasury stock method. No contingent shares were included in diluted shares outstanding during fiscal 2012 and 2011 as the specified conversion price exceeded the average market price of the Company’s common stock, and the inclusion of contingent shares would have been anti-dilutive. See Note 8 for more details on the Convertible Notes and their redemption.

Commitments, Contingencies and Litigation

12 Months Ended

Mar. 31, 2013

18. Commitments, Contingencies and Litigation

Litigation and Other Legal Matters

The Company is involved in litigation incidental to the conduct of its business, the results of which, in the opinion of management, are not likely to be material to the Company’s financial condition, results of operations, or cash flows.

In fiscal 2009, the Court of Commerce in Lyon, France ruled that the Company’s French subsidiary, EnerSys Sarl, which was acquired by the Company in 2002, was partially responsible for a 1999 fire in a French hotel under construction. The Company’s portion of damages was assessed at €2,700 or $4,200 which was duly recorded and paid by the Company, but the ruling was appealed. In a subsequent ruling by the Court of Appeal of Lyon, France, the portion of damages was reduced, entitling the Company to a refund of the monies paid of €671 or $900 which has been recorded and collected in the second quarter of fiscal 2012. The Company further appealed the ruling to the French Supreme Court, which on March 14, 2012, ruled in the Company’s favor and ordered the case back to the Court of Appeal of Lyon to further review certain aspects of the original decision in the case, including the assessment of damages. The Court of Appeal of Lyon heard arguments on April 9, 2013 and a ruling is expected in the second quarter of fiscal 2014.

Environmental Issues

As a result of its operations, the Company is subject to various federal, state and local, as well as international environmental laws and regulations and is exposed to the costs and risks of registering, handling, processing, storing, transporting, and disposing of hazardous substances, especially lead and acid. The Company’s operations are also subject to federal, state, local and international occupational safety and health regulations, including laws and regulations relating to exposure to lead in the workplace.

The Company is responsible for certain cleanup obligations at the former Yuasa battery facility in Sumter, South Carolina that predates its ownership of this facility. This manufacturing facility was closed in 2001 and is separate from the Company’s current metal fabrication facility in Sumter. The Company has established a reserve for this facility. As of March 31, 2013 and 2012, the reserves related to this facility totaled $2,915 and $2,995, respectively. Based on current information, the Company’s management believes these reserves are adequate to satisfy the Company’s environmental liabilities at this facility.

Collective Bargaining

At March 31, 2013, the Company had approximately 9,000 employees. Of these employees, approximately 35% were covered by collective bargaining agreements. The average term of these agreements is two years, with the longest term being four years. Approximately 33% of these agreements expire over the next twelve months.

Lead Contracts

To stabilize its costs, the Company has entered into contracts with financial institutions to fix the price of lead. The vast majority of such contracts are for a period not extending beyond one year. Under these contracts, at March 31, 2013 and 2012, the Company hedged the price to purchase approximately 56.3 million pounds and 60.0 million pounds of lead, respectively, for a total purchase price of $56,601 and $56,610, respectively.

Foreign Currency Forward Contracts

The Company quantifies and monitors its global foreign currency exposures. On a selective basis the Company will enter into foreign currency forward and option contracts to reduce the volatility from currency movements that affect the Company. The vast majority of such contracts are for a period not extending beyond one year. The Company’s largest exposure is from the purchase and conversion of U.S. dollar based lead costs into local currencies in Europe. Additionally, the Company has currency exposures from intercompany and third-party trade transactions. To hedge these exposures, the Company has entered into a total of $73,115 and $53,531, of foreign currency forward contracts with financial institutions as of March 31, 2013 and 2012, respectively.

Interest Rate Swap Agreements

The Company is exposed to changes in variable U.S. interest rates on borrowings under its credit agreements. On a selective basis, from time to time, the Company enters into interest rate swap agreements to reduce the negative impact that increases in interest rates could have on its outstanding variable rate debt. At March 31, 2013 and 2012, such agreements, which expired in May 2013, converted $65,000 and $85,000, respectively, of variable-rate debt to a fixed-rate basis utilizing the three-month LIBOR as a floating rate reference. Fluctuations in LIBOR and fixed rates affect both the Company’s net financial investment position and the amount of cash to be paid or received under these agreements.

The entire disclosure for commitments and contingencies.

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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Restructuring Plans

12 Months Ended

Mar. 31, 2013

Restructuring Plans

19. Restructuring Plans

The Company has acquisition related restructuring plans and non-acquisition related restructuring plans and bases its restructuring accounting and disclosures on the applicable accounting guidance. As a result, charges to net earnings were made in the periods in which restructuring plan liabilities were incurred.

Acquisition related restructuring plan

In fiscal 2010, the Company acquired the stock of OEB Traction Batteries and certain operating assets and liabilities of the reserve power battery business of Accu Holding AG and its Swedish sales subsidiary (all collectively referred to as “Oerlikon”). The Company completed the process of closing the two manufacturing facilities of Oerlikon during the third quarter of fiscal 2011, which resulted in the reduction of approximately 100 employees. The Company recorded restructuring charges related to this plan of $4,526 in fiscal 2010 through fiscal 2012. This plan has been completed as of March 31, 2012.

A roll-forward of the acquisition related restructuring reserve is as follows:


	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2010	$	1,292		$	—		$	1,292
Accrued		108			2,438			2,546
Costs incurred		(1,107	)		(2,313	)		(3,420	)
Foreign currency impact and other		(36	)		21			(15	)

Balance at March 31, 2011		257			146			403
Accrued		81			630			711
Costs incurred		(338	)		(776	)		(1,114	)
Foreign currency impact and other		—			—			—

Balance at March 31, 2012	$	—		$	—		$	—

Non-acquisition related restructuring plans

In February and May 2009, the Company announced a plan to restructure certain of its EMEA and American operations, which resulted in a reduction of approximately 470 employees upon completion across its operations. These actions were primarily in EMEA and included charges for employee-related severance payments and asset impairments, the most significant of which was the closure of its leased Italian manufacturing facility and the opening of a new Italian distribution center. The Company recorded restructuring charges of $31,753 in fiscal 2009 through fiscal 2012. This plan has been completed as of March 31, 2012.

During fiscal 2011, the Company announced a restructuring of its EMEA operations, which resulted in a reduction of approximately 60 employees upon completion across its operations. The Company recorded restructuring charges of $5,178 in fiscal 2011 through 2012, with no additional charges in fiscal 2013. These charges were primarily from cash expenses for employee severance-related payments. The Company incurred $4,579 of costs against the accrual during fiscal 2011 through 2012, with an additional $556 of costs incurred during fiscal 2013. This plan has been completed as of March 31, 2013.

During fiscal 2012, the Company announced restructuring plans related to its operations in EMEA, primarily consisting of the transfer of manufacturing of select products between certain of its manufacturing operations and restructuring of its selling, general and administrative operations, which is expected to result in the reduction of approximately 85 employees upon completion. The Company estimates that the total charges for these actions will amount to approximately $3,600, primarily from cash expenses for employee severance-related payments. The Company recorded restructuring charges of $3,070 in fiscal 2012 with an additional $475 of charges in fiscal 2013. The Company incurred $2,433 of costs against the accrual during fiscal 2012, with an additional $913 of costs incurred in fiscal 2013. As of March 31, 2013, the reserve balance associated with these actions is $185. The Company does not expect to be committed to significant additional restructuring charges in fiscal 2014 related to these actions and expects to complete the program during fiscal 2014.

During fiscal 2013, the Company announced further restructurings related to improving the efficiency of its manufacturing operations in EMEA. The Company estimates that the total charges for these actions will amount to approximately $8,100, primarily from cash expenses for employee severance-related payments and non-cash expenses associated with the write-off of certain fixed assets and inventory. The Company estimates that these actions will result in the reduction of approximately 130 employees upon completion. During fiscal 2013, the Company recorded restructuring charges of $3,998, consisting of non-cash charges of $1,399 related to the write-off of fixed assets and inventory, along with cash charges related to employee severance and other charges of $2,599. During fiscal 2013, the Company incurred $952 of costs against the accrual. As of March 31, 2013, the reserve balance associated with these actions is $1,594. The Company expects to be committed to an additional $3,000 of restructuring charges related to these actions during fiscal 2014, and expects to complete the program during fiscal 2015.

During fiscal 2013, the Company announced a restructuring related to the closure of its manufacturing facility located in Chaoan, People’s Republic of China, in which the Company will transfer the manufacturing at that location to its other facilities in the People’s Republic of China, to improve operational efficiencies. The Company estimates that the total charges related to this action will amount to approximately $3,400. During fiscal 2013, the Company recorded restructuring charges of $2,691, consisting of non-cash charges of $2,290 related to the write-off of fixed assets and inventory, along with cash charges related to employee severance and other charges of $401. During fiscal 2013, the Company incurred $221 in costs against the accrual. As of March 31, 2013, the reserve balance associated with this action is $180. The Company expects to be committed to an additional $700 of restructuring charges related to these actions. The Company expects to complete the restructuring during fiscal 2014.

A roll-forward of the non-acquisition related restructuring reserve is as follows:


	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2010	$	7,482		$	—		$	7,482
Accrued		4,267			—			4,267
Costs incurred		(6,945	)		—			(6,945	)
Foreign currency impact and other		116			—			116

Balance at March 31, 2011	$	4,920		$	—		$	4,920
Accrual adjustment		(681	)		—			(681	)
Accrued		4,958			—			4,958
Costs incurred		(7,966	)		—			(7,966	)
Foreign currency impact and other		(45	)		—			(45	)

Balance at March 31, 2012	$	1,186		$	—		$	1,186
Accrued		3,093			382			3,475
Costs incurred		(2,485	)		(157	)		(2,642	)
Foreign currency impact and other		(56	)		(4	)		(60	)

Balance at March 31, 2013	$	1,738		$	221		$	1,959

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

Other (Income) Expense, Net and Charges Related to Refinancing

Warranty

12 Months Ended

Mar. 31, 2013

Warranty

20. Warranty

The Company provides for estimated product warranty expenses when the related products are sold and are included within accrued expenses and other liabilities. Because warranty estimates are forecasts that are based on the best available information, primarily historical claims experience, costs may differ from amounts provided. An analysis of changes in the liability for product warranties is as follows:


Balance at March 31, 2010	$	31,739
Current year provisions		20,565
Costs incurred		(17,499	)
Foreign exchange and other		1,201

Balance at March 31, 2011		36,006
Current year provisions		26,841
Costs incurred		(20,185	)
Foreign exchange and other		(595	)

Balance at March 31, 2012		42,067
Current year provisions		19,724
Costs incurred		(20,945	)
Foreign exchange and other		1,745

Balance at March 31, 2013	$	42,591

Other (Income) Expense, Net and Charges Related to Refinancing

12 Months Ended

Mar. 31, 2013

21. Other (Income) Expense, Net and Charges Related to Refinancing

Other (income) expense, net consists of the following:


	Fiscal Years Ended March 31,
	2013			2012		2011
Foreign exchange transaction losses	$	1,887		$	1,483	$	732
Insurance recoveries		(1,800	)		—		—
Secondary offering fees		—			—		615
Other		829			1,585		830

Total	$	916		$	3,068	$	2,177

Charges related to refinancing:


	Fiscal Years Ended March 31,
	2013		2012		2011
Charges related to refinancing	$	—	$	—	$	8,155

In fiscal 2011, the Company incurred charges of $8,155 in connection with the refinancing of the Company’s previous credit facility. These charges included $2,308 in write-offs of deferred financing fees and $5,847 of losses from discontinuing hedge accounting for the interest rate swap agreements.

Operations by Industry Segment and Geographic Area

12 Months Ended

Mar. 31, 2013

Operations by Industry Segment and Geographic Area

22. Operations by Industry Segment and Geographic Area

Summarized financial information related to the Company’s reportable segments at March 31, 2013, 2012 and 2011 and for each of the fiscal years then ended is shown below.


	Fiscal Years Ended March 31,
	2013			2012			2011
Net sales by segment to unaffiliated customers
EMEA	$	926,165		$	995,431		$	890,313
Americas		1,126,904			1,082,747			896,629
Asia		224,490			205,191			177,520

Total net sales	$	2,277,559		$	2,283,369		$	1,964,462

Net sales by product line
Reserve power	$	1,118,965		$	1,092,734		$	970,480
Motive power		1,158,594			1,190,635			993,982

Total net sales	$	2,277,559		$	2,283,369		$	1,964,462

Intersegment sales
EMEA	$	76,947		$	75,652		$	55,586
Americas		36,854			38,115			42,141
Asia		31,246			21,182			21,349

Total intersegment sales⁽¹⁾	$	145,047		$	134,949		$	119,076

Operating earnings
EMEA	$	64,032		$	63,872		$	55,643
Americas		171,854			138,894			124,515
Asia		21,146			12,133			10,469
Restructuring charges—EMEA		(4,473	)		(4,988	)		(6,813	)
Restructuring charges—Asia		(2,691	)		—			—
Legal proceedings settlement income—EMEA		—			900			—

Total operating earnings⁽²⁾	$	249,868		$	210,811		$	183,814

Property, plant and equipment, net
EMEA	$	152,577		$	161,854		$	169,056
Americas		152,678			144,701			142,263
Asia		44,871			46,660			33,066

Total	$	350,126		$	353,215		$	344,385

Capital Expenditures
EMEA	$	20,761		$	21,631		$	22,034
Americas		29,566			20,862			22,368
Asia		4,959			6,450			15,538

Total	$	55,286		$	48,943		$	59,940

Depreciation and Amortization
EMEA	$	22,255		$	25,451		$	21,564
Americas		23,073			21,466			19,842
Asia		5,174			3,443			2,987

Total	$	50,502		$	50,360		$	44,393

(1)

Intersegment sales are presented on a cost-plus basis which takes into consideration the effect of transfer prices between legal entities.

(2)

The Company does not allocate interest expense or other (income) expense to the reportable segments.

The Company markets its products and services in over 100 countries. Sales are attributed to countries based on the location of sales order approval and acceptance. Sales to customers in the United States were 43.0%, 42.6% and 41.3% for fiscal years ended March 31, 2013, 2012 and 2011, respectively. Property, plant and equipment, net, attributable to the United States as of March 31, 2013 and 2012, were $127,191 and $119,242, respectively. No single country, outside the United States, accounted for more than 10% of the consolidated net sales or net property, plant and equipment and therefore was deemed not material for separate disclosure.

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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Quarterly Financial Data

12 Months Ended

Mar. 31, 2013

Quarterly Financial Data

23. Quarterly Financial Data (Unaudited)

The Company reports interim financial information for 13-week periods, except for the first quarter, which always begins on April 1, and the fourth quarter, which always ends on March 31. The four quarters in fiscal 2013 ended on July 1, 2012, September 30, 2012, December 30, 2012, and March 31, 2013, respectively. The four quarters in fiscal 2012 ended on July 3, 2011, October 2, 2011, January 1, 2012, and March 31, 2012, respectively.


	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Fiscal Year
Fiscal year ended March 31, 2013
Net sales	$	593,910	$	554,212	$	557,320	$	572,117	$	2,277,559
Gross profit		148,306		138,339		143,698		139,013		569,356
Operating earnings⁽¹⁾		70,255		62,885		59,737		56,991		249,868
Net earnings		45,564		43,011		38,677		37,706		164,958
Net earnings attributable to EnerSys stockholders		45,804		43,790		39,184		37,730		166,508
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.96	$	0.91	$	0.81	$	0.79	$	3.47
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.95	$	0.90	$	0.80	$	0.77	$	3.42
Fiscal year ended March 31, 2012
Net sales	$	569,229	$	547,140	$	574,246	$	592,754	$	2,283,369
Gross profit		121,971		114,395		130,876		145,463		512,705
Operating earnings⁽²⁾		48,715		42,440		53,777		65,879		210,811
Net earnings		33,496		28,289		36,859		45,323		143,967
Net earnings attributable to EnerSys stockholders		33,496		28,289		36,859		45,359		144,003
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.67	$	0.57	$	0.77	$	0.95	$	2.95
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.66	$	0.57	$	0.77	$	0.94	$	2.93

(1)

Included in Operating earnings were restructuring charges of $370, $1,295, $3,776 and $1,723 for the first, second, third and fourth quarters of fiscal 2013, respectively.

(2)

Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

Valuation and Qualifying Accounts

Subsequent Events	12 Months Ended
Subsequent Events	Mar. 31, 2013
Subsequent Events	24. Subsequent Events On May 28, 2013, the Company announced the payment of a quarterly cash dividend of $0.125 per share of common stock to be paid on June 28, 2013, to stockholders of record as of June 14, 2013.

Valuation and Qualifying Accounts

12 Months Ended

Mar. 31, 2013

SCHEDULE II

EnerSys

Valuation and Qualifying Accounts

(In Thousands)


	Balance at Beginning of Period		Additions Charged to Expense		Charge-Offs			Purchase accounting adjustments		Other(1)			Balance at End of Period
Allowance for doubtful accounts:
Fiscal year ended March 31, 2011	$	9,879	$	1,513	$	(1,673	)	$	—	$	828		$	10,547
Fiscal year ended March 31, 2012		10,547		1,395		(2,012	)		—		92			10,022
Fiscal year ended March 31, 2013		10,022		998		(1,568	)		—		(160	)		9,292

Allowance for inventory valuation:
Fiscal year ended March 31, 2011	$	11,678	$	8,329	$	(5,361	)	$	—	$	406		$	15,052
Fiscal year ended March 31, 2012		15,052		7,659		(7,657	)		—		(223	)		14,831
Fiscal year ended March 31, 2013		14,831		7,337		(4,584	)		—		(212	)		17,372

Deferred tax asset—valuation allowance:
Fiscal year ended March 31, 2011	$	58,382	$	825	$	(2,444	)	$	5,340	$	1,514		$	63,617
Fiscal year ended March 31, 2012		63,617		2,457		(7,528	)		1,124		(3,311	)		56,359
Fiscal year ended March 31, 2013		56,359		3,829		(3,259	)		—		(2,387	)		54,542

(1)

Primarily the impact of currency changes.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Mar. 31, 2013

Description of Business

Description of Business

Principles of Consolidation

Principles of Consolidation

Foreign Currency Translation

Foreign Currency Translation

Revenue Recognition

Revenue Recognition

The Company recognizes revenue from the service of its reserve power and motive power products when the respective services are performed.

Accruals are made at the time of sale for sales returns and other allowances based on the Company’s historical experience.

Freight Expense

Freight Expense

Warranties

Warranties

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include all highly liquid investments with an original maturity of three months or less when purchased.

Concentration of Credit Risk

Concentration of Credit Risk

Accounts Receivable

Accounts Receivable

Inventories

Inventories

Inventories are stated at the lower of cost or market. Cost is determined using the first-in, first-out (FIFO) method. The cost of inventory consists of material, labor, and associated overhead.

Property, Plant, and Equipment

Property, Plant, and Equipment

Maintenance and repairs are expensed as incurred. Interest on capital projects is capitalized during the construction period.

Business Combinations

Business Combinations

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets

Environmental Expenditures

Environmental Expenditures

Derivative Financial Instruments

Derivative Financial Instruments

The Company does not have any credit-related contingent features associated with its derivative instruments.

Fair Value of Financial Instruments

Fair Value of Financial Instruments

The fair value of the Company’s cash and cash equivalents, accounts receivable and accounts payable approximate carrying value due to their short maturities.

Income Taxes

Income Taxes

Deferred Financing Fees

Deferred Financing Fees

Retirement Plans

Retirement Plans

Stock-Based Compensation Plans

Stock-Based Compensation Plans

Market Share Units

Restricted Stock Units

Stock Options

Earnings Per Share

Earnings Per Share

Segment Reporting

Segment Reporting

•

Americas, which includes North and South America, with segment headquarters in Reading, Pennsylvania, USA,

•

EMEA, which includes Europe, the Middle East and Africa, with segment headquarters in Zurich, Switzerland, and

•

Asia, which includes Asia, Australia and Oceania, with segment headquarters in Singapore.

New Accounting Pronouncements

New Accounting Pronouncements

Use of Estimates

Use of Estimates

Inventories (Tables)

12 Months Ended

Mar. 31, 2013

Summary Of Net Inventories

Net inventories consist of:


	March 31,
	2013		2012
Raw materials	$	88,787	$	100,538
Work-in-process		113,119		111,629
Finished goods		152,035		149,607

Total	$	353,941	$	361,774

Property, Plant, and Equipment (Tables)

12 Months Ended

Mar. 31, 2013

Summary Of Property, Plant, And Equipment

Property, plant, and equipment consist of:


	March 31,
	2013			2012
Land, buildings, and improvements	$	206,610		$	201,038
Machinery and equipment		528,546			511,599
Construction in progress		25,139			29,779

		760,295			742,416
Less accumulated depreciation		(410,169	)		(389,201	)

Total	$	350,126		$	353,215

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2013

Schedule Of Company's Other Intangible Assets

Information regarding the Company’s other intangible assets are as follows:


	March 31,
	2013							2012
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Indefinite-lived intangible assets:
Trademarks	$	86,298	$	(953	)	$	85,345	$	86,745	$	(953	)	$	85,792
Finite-lived intangible assets:
Customer relationships		14,016		(3,994	)		10,022		14,330		(2,839	)		11,491
Non-compete		2,558		(1,524	)		1,034		2,602		(1,224	)		1,378
Patents		5,383		(1,237	)		4,146		5,230		(615	)		4,615
Trademarks		2,004		(727	)		1,277		2,003		(643	)		1,360
Licenses		2,527		(650	)		1,877		2,640		(194	)		2,446

Total	$	112,786	$	(9,085	)	$	103,701	$	113,550	$	(6,468	)	$	107,082

Schedule Of Changes In The Carrying Amount Of Goodwill By Business Segment

The changes in the carrying amount of goodwill by reportable segment are as follows:


	Fiscal year ended March 31, 2013
	EMEA			Americas			Asia			Total
Balance at beginning of year	$	173,442		$	150,754		$	28,541		$	352,737
Adjustments related to the finalization of purchase accounting for fiscal 2012 acquisitions		155			230			(20	)		365
Foreign currency translation adjustment		(6,889	)		(953	)		239			(7,603	)

Balance at end of year	$	166,708		$	150,031		$	28,760		$	345,499


	Fiscal year ended March 31, 2012
	EMEA			Americas			Asia		Total
Balance at beginning of year	$	177,881		$	143,225		$	22,560	$	343,666
Goodwill acquired during the year		3,164			7,973			5,262		16,399
Adjustments related to the finalization of purchase accounting for fiscal 2011 acquisitions		374			5			—		379
Foreign currency translation adjustment		(7,977	)		(449	)		719		(7,707	)

Balance at end of year	$	173,442		$	150,754		$	28,541	$	352,737

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

Schedule Of Prepaid And Other Current Assets

Prepaid and Other Current Assets (Tables)

12 Months Ended

Mar. 31, 2013

Prepaid and other current assets consist of the following:


	March 31,
	2013		2012
Prepaid non-income taxes	$	27,525	$	23,737
Prepaid income taxes		16,145		7,716
Non-trade receivables		6,096		8,247
Other		14,053		12,693

Total	$	63,819	$	52,393

Accrued Expenses (Tables)

12 Months Ended

Mar. 31, 2013

Summary Of Accrued Expenses

Accrued expenses consist of the following:


	March 31,
	2013		2012
Payroll and benefits	$	52,484	$	55,595
Accrued selling expenses		28,896		26,269
Warranty		20,079		19,274
Income taxes payable		19,273		16,979
Freight		11,768		12,314
VAT and other non-income taxes		10,438		10,966
Deferred income		7,789		12,057
Lead forward contracts		2,832		—
Interest		2,171		2,040
Pension and social security		1,787		1,696
Restructuring		1,959		1,186
Interest rate swaps		654		3,628
Other		31,534		26,399

Total	$	191,664	$	188,403

Debt (Tables)

12 Months Ended

Mar. 31, 2013

Schedule Of Long-Term Debt

The following summarizes the Company’s long-term debt:


	March 31,
	2013		2012
3.375% Convertible Notes, net of discount, due 2038	$	155,273	$	148,272
2011 Credit Facility due 2016		—		79,400
China Term Loan due 2017		—		6,034
India Term Loan due 2017		—		5,383
Other		—		40

		155,273		239,129
Less current portion		—		2,540

Total long-term debt	$	155,273	$	236,589

Components Of Net Carrying Amount Of Convertible Notes

The following represents the principal amount of the liability component, the unamortized discount, and the net carrying amount of our Convertible Notes as of March 31, 2013 and 2012, respectively:


	March 31, 2013			March 31, 2012
Principal	$	172,500		$	172,500
Unamortized discount		(17,227	)		(24,228	)

Net carrying amount	$	155,273		$	148,272

Carrying amount of equity component	$	29,850		$	29,850

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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-Subparagraph (SX 210.5-02.22)
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-Article 5

Schedule Of Capital And Operating Leases

Leases (Tables)

12 Months Ended

Mar. 31, 2013

The Company’s future minimum lease payments under capital and operating leases that have noncancelable terms in excess of one year as of March 31, 2013 are as follows:


	Capital Leases		Operating Leases
2014	$	330	$	19,433
2015		130		14,129
2016		48		10,312
2017		27		6,793
2018		14		4,714
Thereafter		—		8,606

Total minimum lease payments		549	$	63,987

Amounts representing interest		34

Net minimum lease payments, including current portion of $311	$	515

Other Liabilities (Tables)

12 Months Ended

Mar. 31, 2013

Schedule Of Other Long-Term Liabilities

Other liabilities consist of the following:


	March 31,
	2013		2012
Pension and profit sharing obligation	$	34,554	$	30,752
Warranty		22,512		22,793
Long-term income taxes liabilities		17,165		13,520
Deferred income		6,285		6,094
Interest rate swap liabilities		—		244
Other		9,902		19,065

Total	$	90,418	$	92,468

Fair Value of Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2013

Financial Assets And (Liabilities), Measured At Fair Value On A Recurring Basis

The following tables represent the financial assets and (liabilities), measured at fair value on a recurring basis as of March 31, 2013 and March 31, 2012 and the basis for that measurement:


	Total Fair Value Measurement March 31, 2013			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(654	)	$	—	$	(654	)	$	—
Lead forward contracts		(2,832	)		—		(2,832	)		—
Foreign currency forward contracts		(11	)		—		(11	)		—

Total derivatives	$	(3,497	)	$	—	$	(3,497	)	$	—


	Total Fair Value Measurement March 31, 2012			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Interest rate swap agreements	$	(3,872	)	$	—	$	(3,872	)	$	—
Lead forward contracts		(851	)		—		(851	)		—
Foreign currency forward contracts		782			—		782			—

Total derivatives	$	(3,941	)	$	—	$	(3,941	)	$	—

Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments

The carrying amounts and estimated fair values of the Company’s derivatives and Convertible Notes at March 31, 2013 and 2012 were as follows:


	March 31, 2013						March 31, 2012
	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Financial assets:
Derivatives⁽¹⁾	$	241		$	241		$	812		$	812

Financial liabilities:
Convertible Notes	$	155,273	⁽²⁾	$	217,350	⁽³⁾	$	148,272	⁽²⁾	$	200,100	⁽³⁾
Derivatives⁽¹⁾		3,738			3,738			4,753			4,753

(1)

(2)

The carrying amounts of the Convertible Notes at March 31, 2013 and March 31, 2012 represent the $172,500 principal value, less the unamortized debt discount (see Note 8).

(3)

The fair value amounts of the Convertible Notes represent the trading values of the Convertible Notes with a principal value of $172,500 at March 31, 2013 and March 31, 2012.

Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.

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-Publisher FASB
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The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis.

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-Number 157
-Paragraph 33
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Fair Value Of Derivative Instruments In The Consolidated Balance Sheets

Derivative Financial Instruments (Tables)

12 Months Ended

Mar. 31, 2013

Fair Value of Derivative Instruments

March 31, 2013 and 2012


	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging Instruments
	March 31, 2013		March 31, 2012		March 31, 2013		March 31, 2012
Prepaid and other current assets
Foreign currency forward contracts	$	—	$	670	$	241	$	112
Other assets
Lead hedge forward contracts		—		30		—		—

Total assets	$	—	$	700	$	241	$	112

Accrued expenses
Interest rate swap agreements	$	—	$	—	$	654	$	3,628
Lead hedge forward contracts		2,832		881		—		—
Foreign currency forward contracts		252		—		—		—
Other liabilities
Interest rate swap agreements		—		—		—		244

Total liabilities	$	3,084	$	881	$	654	$	3,872

The Effect of Derivative Instruments on the Consolidated Statements of Income

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ended March 31, 2013


Derivatives Designated as Cash Flow Hedges	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)		Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead hedge forward contracts	$	1,623	Cost of goods sold	$	3,309
Foreign currency forward contracts		248	Cost of goods sold		1,703

Total	$	1,871		$	5,012

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ended March 31, 2012


Derivatives Designated as Cash Flow Hedges	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead hedge forward contracts	$	(9,731	)	Cost of goods sold	$	(831	)
Foreign currency forward contracts		(152	)	Cost of goods sold		(3,882	)

Total	$	(9,883	)		$	(4,713	)

The Effect of Derivative Instruments on the Consolidated Statements of Income

For the fiscal year ended March 31, 2011


Derivatives in a Cash Flow Hedging Relationship	Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Interest rate swap contracts	$	(2,835	)	Interest expense	$	(6,698	)
Lead hedge forward contracts		15,930		Cost of goods sold		6,417
Foreign currency forward contracts		(4,031	)	Cost of goods sold		471

Total	$	9,064			$	190

Effect Of Derivative Instruments


Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Other (income) expense, net	$	(101	)
Foreign currency forward contracts	Other (income) expense, net		2,597

Total		$	2,496


Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Gain (Loss)
Interest rate swap contracts	Other (income) expense, net	$	(977	)
Foreign currency forward contracts	Other (income) expense, net		(106	)

Total		$	(1,083	)

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 815
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Topic 815
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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Earnings Before Income Taxes

Income Taxes (Tables)

12 Months Ended

Mar. 31, 2013

Income Tax Expense

Income tax expense is composed of the following:


	Fiscal year ended March 31,
	2013			2012			2011
Current:
Federal	$	38,480		$	30,459		$	24,232
State		5,684			3,778			2,736
Foreign		19,438			16,282			14,114

Total current		63,602			50,519			41,082
Deferred:
Federal		3,915			(1,609	)		(1,358	)
State		214			(962	)		2,010
Foreign		(2,456	)		(656	)		(3,716	)

Total deferred		1,673			(3,227	)		(3,064	)

Income tax expense	$	65,275		$	47,292		$	38,018

Earnings before income taxes consists of the following:


	Fiscal year ended March 31,
	2013		2012		2011
United States	$	107,191	$	87,597	$	57,710
Foreign		123,042		103,662		93,734

Earnings before income taxes	$	230,233	$	191,259	$	151,444

Deferred Tax Assets And Liabilities

The following table sets forth the tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities:


	March 31,
	2013			2012
Deferred tax assets:
Accounts receivable	$	660		$	1,111
Inventories		4,345			6,707
Net operating loss carryforwards		67,834			71,773
Accrued expenses		32,773			26,997
Other assets		9,703			10,228

Gross deferred tax assets		115,315			116,816
Less valuation allowance		(54,542	)		(56,359	)

Total deferred tax assets		60,773			60,457
Deferred tax liabilities:
Property, plant and equipment		28,985			30,957
Other intangible assets		48,142			46,628
Convertible Notes		22,386			21,616
Other liabilities		865			2,400

Total deferred tax liabilities		100,378			101,601

Net deferred tax liabilities	$	(39,605	)	$	(41,144	)

Reconciliation Of Income Taxes At The Statutory Rate

A reconciliation of income taxes at the statutory rate to the income tax provision is as follows:


	Fiscal year ended March 31,
	2013			2012			2011
United States statutory income tax expense (at 35%)	$	80,581		$	66,962		$	53,005
Increase (decrease) resulting from:
State income taxes, net of federal effect		3,742			1,592			3,035
Nondeductible expenses, domestic manufacturing deduction and other		7,664			1,587			(1,848	)
Effect of foreign operations		(27,883	)		(20,028	)		(14,841	)
Valuation allowance		1,171			(2,821	)		(1,333	)

Income tax expense	$	65,275		$	47,292		$	38,018

Reconciliation Of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits under FASB guidance is as follows:


March 31, 2010	$	10,750
Increases related to current year tax positions		2,896
Increases related to prior year tax positions		324
Increases related to prior year tax positions due to foreign currency translation		122
Decreases related to prior year tax position settled		(3,145	)
Lapse of statute of limitations		(302	)

March 31, 2011		10,645
Increases related to current year tax positions		5,032
Increases related to prior year tax positions		182
Decreases related to prior year tax positions due to foreign currency translation		(28	)
Lapse of statute of limitations		(2,886	)

March 31, 2012		12,945
Increases related to current year tax positions		6,296
Increases related to prior year tax positions		969
Increases related to prior year tax positions due to foreign currency translation		245
Lapse of statute of limitations		(3,970	)

March 31, 2013	$	16,485

Retirement Plans (Tables)

12 Months Ended

Mar. 31, 2013

Components Of Net Periodic Pension Cost

Net periodic pension cost for fiscal 2013, 2012 and 2011, includes the following components:


	United States Plans									International Plans
	Fiscal year ended March 31,									Fiscal year ended March 31,
	2013			2012			2011			2013			2012			2011
Service cost	$	349		$	285		$	250		$	679		$	645		$	603
Interest cost		649			668			646			2,377			2,504			2,503
Expected return on plan assets		(756	)		(706	)		(624	)		(1,851	)		(1,787	)		(1,615	)
Amortization and deferral		393			238			248			209			32			53

Net periodic benefit cost	$	635		$	485		$	520		$	1,414		$	1,394		$	1,544

Summary Of Change In Projected Benefit Obligation


	United States Plans						International Plans
	March 31,						March 31,
	2013			2012			2013			2012
Change in projected benefit obligation
Benefit obligation at the beginning of the period	$	14,040		$	11,903		$	53,895		$	48,881
Service cost		349			285			679			645
Interest cost		649			668			2,377			2,504
Benefits paid, inclusive of plan expenses		(664	)		(615	)		(1,667	)		(1,709	)
Plan settlements		—			—			—			(40	)
Experience loss		1,537			1,799			7,099			5,442
Foreign currency translation adjustment		—			—			(2,507	)		(1,828	)

Benefit obligation at the end of the period	$	15,911		$	14,040		$	59,876		$	53,895

Summary Of Change In Plan Assets


	United States Plans						International Plans
	March 31,						March 31,
	2013			2012			2013			2012
Change in plan assets
Fair value of plan assets at the beginning of the period	$	9,192		$	8,746		$	26,942		$	25,779
Actual return on plan assets		843			420			4,024			1,555
Employer contributions		963			641			1,639			1,505
Benefits paid, inclusive of plan expenses		(664	)		(615	)		(1,667	)		(1,709	)
Plan settlements		—			—			—			(40	)
Foreign currency translation adjustment		—			—			(1,470	)		(148	)

Fair value of plan assets at the end of the period	$	10,334		$	9,192		$	29,468		$	26,942

Funded status deficit	$	(5,577	)	$	(4,848	)	$	(30,408	)	$	(26,953	)

Summary Of Amounts Recognized In The Balance Sheets


	March 31,
	2013			2012
Amounts recognized in the consolidated balance sheets consist of:
Other assets	$	—		$	260
Accrued expenses		(1,431	)		(1,309	)
Other liabilities		(34,554	)		(30,752	)

	$	(35,985	)	$	(31,801	)

Summary Of Amounts In AOCI Before Taxes

The following table represents pension components (before tax) and related changes (before tax) recognized in AOCI for the Company’s pension plans for the years ended March 31, 2013, 2012 and 2011:


	Fiscal year ended March 31,
	2013			2012			2011
Amounts recorded in AOCI before taxes:
Prior service cost	$	(816	)	$	(922	)	$	(1,054	)
Net loss		(16,645	)		(11,176	)		(3,712	)

Net amount recognized	$	(17,461	)	$	(12,098	)	$	(4,766	)

Summary Of Changes In AOCI


	Fiscal year ended March 31,
	2013			2012			2011
Changes in plan assets and benefit obligations:
New prior service cost	$	—		$	—		$	905
Net loss (gain) arising during the year		6,376			7,757			(3,505	)
Effect of exchange rates on amounts included in AOCI		(392	)		(176	)		151
Amounts recognized as a component of net periodic benefit costs:
Amortization of prior service cost		(79	)		(83	)		(62	)
Amortization or settlement recognition of net loss		(523	)		(187	)		(250	)

Total recognized in other comprehensive income	$	5,382		$	7,311		$	(2,761	)

Summary Of Recognized Components Of Net Periodic Pension Cost Included In Accumulated Other Comprehensive Income

The amounts included in AOCI as of March 31, 2013 that are expected to be recognized as components of net periodic pension cost during the fiscal year ended March 31, 2014 are as follows:


Net loss	$	(866	)
Prior service cost		(78	)

Net amount expected to be recognized	$	(944	)

Summary Of Accumulated Benefit Obligation Related To All Defined Pension Plans


	United States Plans				International Plans
	March 31,				March 31,
	2013		2012		2013		2012
All defined benefit plans:
Accumulated benefit obligation	$	15,911	$	14,040	$	56,135	$	50,416
Unfunded defined benefit plans:
Projected benefit obligation		—		—		28,444		26,892
Accumulated benefit obligation		—		—		27,032		25,508
Defined benefit plans with a projected benefit obligation in excess of the fair value of plan assets:
Projected benefit obligation	$	15,911	$	14,040	$	59,876	$	28,003
Accumulated benefit obligation		15,911		14,040		56,135		26,445
Fair value of plan assets		10,334		9,192		29,468		789
Defined benefit plans with an accumulated benefit obligation in excess of the fair value of plan assets:
Projected benefit obligation	$	15,911	$	14,040	$	29,571	$	28,003
Accumulated benefit obligation		15,911		14,040		27,985		26,445
Fair value of plan assets		10,334		9,192		777		789

Significant Assumptions Used To Determine The Net Periodic Benefit Cost

Significant assumptions used to determine the net periodic benefit cost for the US and International plans were as follows:


	United States Plans									International Plans
	Fiscal year ended March 31,									Fiscal year ended March 31,
	2013			2012			2011			2013			2012			2011
Discount rate		4.8	%		5.7	%		6.0	%		2.5-5.5	%		4.0-5.5	%		4.3-6.0	%
Expected return on plan assets		8.0			8.0			8.0			5.5-7.0			5.5-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			N/A			2.0-4.0			2.0-4.0			2.0-3.5

Significant Assumptions Used To Determine The Projected Benefit Obligations

Significant assumptions used to determine the projected benefit obligations for the US and International plans were as follows:


	United States Plans						International Plans
	March 31,						March 31,
	2013			2012			2013			2012
Discount rate		4.0	%		4.8	%		2.5-4.4	%		2.5-5.5	%
Expected return on plan assets		8.0			8.0			4.0-7.0			5.5-7.0
Rate of compensation increase		N/A			N/A			2.0-4.0			2.0-4.0

Summary Of Pension Plan Investments Measured At Fair Value

The following table represents our pension plan investments measured at fair value as of March 31, 2013 and 2012 and the basis for that measurement:


	March 31, 2013
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset category:
Cash and cash equivalents	$	1,454	$	1,454	$	—	$	—	$	—	$	—	$	—	$	—
Equity securities
US^(a)		5,346		5,346		—		—		2,856		2,856		—		—
International^(b)		905		905		—		—		15,617		15,617		—		—
Fixed income^(c)		2,629		2,629		—		—		10,995		10,995		—		—

Total	$	10,334	$	10,334	$	—	$	—	$	29,468	$	29,468	$	—	$	—


	March 31, 2012
	United States Plans								International Plans
	Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total Fair Value Measurement		Quoted Price In Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Asset category:
Cash and cash equivalents	$	868	$	868	$	—	$	—	$	—	$	—	$	—	$	—
Equity securities
US^(a)		5,067		5,067		—		—		2,742		2,742		—		—
International^(b)		837		837		—		—		14,728		14,728		—		—
Fixed income^(c)		2,420		2,420		—		—		9,472		9,472		—		—

Total	$	9,192	$	9,192	$	—	$	—	$	26,942	$	26,942	$	—	$	—

(a)

(b)

(c)

Fixed income consists primarily of investment grade bonds from diversified industries.

Summary Of Estimated Future Benefit Payments

Estimated future benefit payments under the Company’s pension plans are as follows:


	Pension Benefits
2014	$	2,486
2015		2,253
2016		2,464
2017		2,888
2018		2,872
Years 2019-2023		17,519

Stockholders' Equity and Noncontrolling Interests (Tables)

12 Months Ended

Mar. 31, 2013

Change in Number of Shares of Common Stock Outstanding

The following demonstrates the change in the number of shares of common stock outstanding during fiscal years ended March 31, 2011, 2012 and 2013, respectively:


Shares outstanding as of March 31, 2010	48,581,832
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	1,452,521

Shares outstanding as of March 31, 2011	50,034,353
Purchase of treasury stock	(2,646,885	)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	412,661

Shares outstanding as of March 31, 2012	47,800,129
Purchase of treasury stock	(683,192	)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	723,267

Shares outstanding as of March 31, 2013	47,840,204

Components Of Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income are as follows:


	Beginning Balance			Before-Tax Amount			Tax Benefit (Expense)			Net-of-Tax Amount			Ending Balance
March 31, 2013
Pension funded status adjustment	$	(8,982	)	$	(5,382	)	$	1,195		$	(4,187	)	$	(13,169	)
Net unrealized gain (loss) on derivative instruments		1,175			(3,141	)		1,134			(2,007	)		(832	)
Foreign currency translation adjustment		81,900			(27,244	)		—			(27,244	)		54,656

Accumulated other comprehensive income	$	74,093		$	(35,767	)	$	2,329		$	(33,438	)	$	40,655

March 31, 2012
Pension funded status adjustment	$	(3,512	)	$	(7,311	)	$	1,841		$	(5,470	)	$	(8,982	)
Net unrealized gain (loss) on derivative instruments		4,436			(5,170	)		1,909			(3,261	)		1,175
Foreign currency translation adjustment		114,256			(32,356	)		—			(32,356	)		81,900

Accumulated other comprehensive income	$	115,180		$	(44,837	)	$	3,750		$	(41,087	)	$	74,093

March 31, 2011
Pension funded status adjustment	$	(5,479	)	$	2,761		$	(794	)	$	1,967		$	(3,512	)
Net unrealized gain (loss) on derivative instruments		(5,034	)		14,721			(5,251	)		9,470			4,436
Foreign currency translation adjustment		77,717			36,539			—			36,539			114,256

Accumulated other comprehensive income	$	67,204		$	54,021		$	(6,045	)	$	47,976		$	115,180

Summary of Redeemable Noncontrolling Interests

The following demonstrates the change in redeemable noncontrolling interests during the fiscal years ended March 31, 2012 and 2013, respectively:


Balance as of March 31, 2011	$	—
Redeemable noncontrolling interests recognized in acquisitions of Powertech Batteries and Energy Leader Batteries India Limited		9,916
Net losses attributable to redeemable noncontrolling interests		(170	)
Foreign currency translation adjustment		36

Balance as of March 31, 2012	$	9,782
Net losses attributable to redeemable noncontrolling interests		(1,429	)
Loan to equity conversion by redeemable noncontrolling interests		3,901
Foreign currency translation adjustment		(1,159	)

Balance as of March 31, 2013	$	11,095

Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number D-98
-Paragraph 44
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number D-98
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number D-98
-Paragraph 40
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number D-98
-Paragraph 41
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number D-98
-Paragraph 42
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 25
-Appendix A

Summary Of Stock Option Activity

Stock-Based Compensation (Tables)

12 Months Ended

Mar. 31, 2013

The following table summarizes the Company’s stock option activity in the years indicated:


	Number of Options			Weighted- Average Remaining Contract Term (Years)		Weighted- Average Exercise Price		Aggregate Intrinsic Value
Options outstanding as of March 31, 2010		2,431,233			4.0	$	17.69	$	19,191
Exercised		(1,415,391	)				15.34		18,482
Canceled		(155,063	)				29.32		9

Options outstanding as of March 31, 2011		860,779			6.2	$	19.52	$	17,129
Exercised		(227,116	)				15.82		3,691

Options outstanding as of March 31, 2012		633,663			6.1	$	20.85	$	8,879
Exercised		(555,677	)				21.70		8,860

Options outstanding and exercisable as of March 31, 2013		77,986			2.5	$	14.76	$	2,404

Summary Of Information Regarding Stock Options Outstanding And Exercisable

The following table summarizes information regarding stock options outstanding, all of which are also exercisable, as of March 31, 2013:


	Options Outstanding and Exercisable
Range of Exercise Prices	Number of Options		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price
$10.01-$15.00		65,954		2.1	$	14.12
$15.01-$30.19		12,032		4.1		18.29

		77,986		2.5	$	14.76

Summary Of Changes Of Non-Vested Options

A summary of the status of the Company’s non-vested options as of March 31, 2013, and changes during fiscal 2013, is presented below:


	Number of Options			Weighted- Average Grant-Date Fair Value
Nonvested at March 31, 2012		110,037		$	7.87
Vested		(110,037	)		7.87

Nonvested at March 31, 2013		—		$	—

Summary Of The Changes In Restricted Stock Units And Market Share Units


	Restricted Stock Units (RSU)					Market Share Units (MSU)
	Number of RSU			Weighted- Average Grant Date Fair Value		Number of MSU			Weighted- Average Grant Date Fair Value
Non-vested awards as of March 31, 2012		617,240		$	24.61		346,563		$	43.38
Granted		229,879			31.23		303,942			41.36
Vested		(238,320	)		23.99		—			—
Canceled		(6,693	)		32.01		(20,466	)		46.77

Non-vested awards as of March 31, 2013		602,106		$	27.30		630,039		$	42.29

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

Reconciliation From Basic To Diluted Average Common Shares And Net Earnings Per Common Share

Earnings Per Share (Tables)

12 Months Ended

Mar. 31, 2013


	March 31,
	2013		2012		2011
Net earnings attributable to EnerSys stockholders	$	166,508	$	144,003	$	113,426

Weighted-average number of common shares outstanding:
Basic		48,022,005		48,748,205		49,376,132
Dilutive effect of:
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired		593,422		467,830		668,114
Convertible Notes		20,022		—		—

Diluted weighted-average number of common shares outstanding		48,635,449		49,216,035		50,044,246

Basic earnings per common share attributable to EnerSys stockholders	$	3.47	$	2.95	$	2.30

Diluted earnings per common share attributable to EnerSys stockholders	$	3.42	$	2.93	$	2.27

Anti-dilutive equity awards not included in diluted weighted-average common shares		—		221,097		—

Restructuring Plans (Tables)

12 Months Ended

Mar. 31, 2013

Acquisition And Non-Acquisition Related Restructuring Reserve

A roll-forward of the acquisition related restructuring reserve is as follows:


	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2010	$	1,292		$	—		$	1,292
Accrued		108			2,438			2,546
Costs incurred		(1,107	)		(2,313	)		(3,420	)
Foreign currency impact and other		(36	)		21			(15	)

Balance at March 31, 2011		257			146			403
Accrued		81			630			711
Costs incurred		(338	)		(776	)		(1,114	)
Foreign currency impact and other		—			—			—

Balance at March 31, 2012	$	—		$	—		$	—

Non-Acquisition Related Restructuring Reserve

Acquisition And Non-Acquisition Related Restructuring Reserve

A roll-forward of the non-acquisition related restructuring reserve is as follows:


	Employee Severance			Plant Closure and Other			Total
Balance at March 31, 2010	$	7,482		$	—		$	7,482
Accrued		4,267			—			4,267
Costs incurred		(6,945	)		—			(6,945	)
Foreign currency impact and other		116			—			116

Balance at March 31, 2011	$	4,920		$	—		$	4,920
Accrual adjustment		(681	)		—			(681	)
Accrued		4,958			—			4,958
Costs incurred		(7,966	)		—			(7,966	)
Foreign currency impact and other		(45	)		—			(45	)

Balance at March 31, 2012	$	1,186		$	—		$	1,186
Accrued		3,093			382			3,475
Costs incurred		(2,485	)		(157	)		(2,642	)
Foreign currency impact and other		(56	)		(4	)		(60	)

Balance at March 31, 2013	$	1,738		$	221		$	1,959

Warranty (Tables)

12 Months Ended

Mar. 31, 2013

Analysis Of Changes In Liability For Product Warranties

An analysis of changes in the liability for product warranties is as follows:


Balance at March 31, 2010	$	31,739
Current year provisions		20,565
Costs incurred		(17,499	)
Foreign exchange and other		1,201

Balance at March 31, 2011		36,006
Current year provisions		26,841
Costs incurred		(20,185	)
Foreign exchange and other		(595	)

Balance at March 31, 2012		42,067
Current year provisions		19,724
Costs incurred		(20,945	)
Foreign exchange and other		1,745

Balance at March 31, 2013	$	42,591

Other (Income) Expense, Net and Charges Related to Refinancing (Tables)

12 Months Ended

Mar. 31, 2013

Summary Of Other (Income) Expense, Net

Other (income) expense, net consists of the following:


	Fiscal Years Ended March 31,
	2013			2012		2011
Foreign exchange transaction losses	$	1,887		$	1,483	$	732
Insurance recoveries		(1,800	)		—		—
Secondary offering fees		—			—		615
Other		829			1,585		830

Total	$	916		$	3,068	$	2,177

Summary Of Charges Related To Refinancing

Charges related to refinancing:


	Fiscal Years Ended March 31,
	2013		2012		2011
Charges related to refinancing	$	—	$	—	$	8,155

Operations by Industry Segment and Geographic Area (Tables)

12 Months Ended

Mar. 31, 2013

Summary Of Financial Information Related To The Company's Business Segments

Summarized financial information related to the Company’s reportable segments at March 31, 2013, 2012 and 2011 and for each of the fiscal years then ended is shown below.


	Fiscal Years Ended March 31,
	2013			2012			2011
Net sales by segment to unaffiliated customers
EMEA	$	926,165		$	995,431		$	890,313
Americas		1,126,904			1,082,747			896,629
Asia		224,490			205,191			177,520

Total net sales	$	2,277,559		$	2,283,369		$	1,964,462

Net sales by product line
Reserve power	$	1,118,965		$	1,092,734		$	970,480
Motive power		1,158,594			1,190,635			993,982

Total net sales	$	2,277,559		$	2,283,369		$	1,964,462

Intersegment sales
EMEA	$	76,947		$	75,652		$	55,586
Americas		36,854			38,115			42,141
Asia		31,246			21,182			21,349

Total intersegment sales⁽¹⁾	$	145,047		$	134,949		$	119,076

Operating earnings
EMEA	$	64,032		$	63,872		$	55,643
Americas		171,854			138,894			124,515
Asia		21,146			12,133			10,469
Restructuring charges—EMEA		(4,473	)		(4,988	)		(6,813	)
Restructuring charges—Asia		(2,691	)		—			—
Legal proceedings settlement income—EMEA		—			900			—

Total operating earnings⁽²⁾	$	249,868		$	210,811		$	183,814

Property, plant and equipment, net
EMEA	$	152,577		$	161,854		$	169,056
Americas		152,678			144,701			142,263
Asia		44,871			46,660			33,066

Total	$	350,126		$	353,215		$	344,385

Capital Expenditures
EMEA	$	20,761		$	21,631		$	22,034
Americas		29,566			20,862			22,368
Asia		4,959			6,450			15,538

Total	$	55,286		$	48,943		$	59,940

Depreciation and Amortization
EMEA	$	22,255		$	25,451		$	21,564
Americas		23,073			21,466			19,842
Asia		5,174			3,443			2,987

Total	$	50,502		$	50,360		$	44,393

(1)

Intersegment sales are presented on a cost-plus basis which takes into consideration the effect of transfer prices between legal entities.

(2)

The Company does not allocate interest expense or other (income) expense to the reportable segments.

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

Summary Of Interim Financial Information

Quarterly Financial Data (Tables)

12 Months Ended

Mar. 31, 2013


	1st Quarter		2nd Quarter		3rd Quarter		4th Quarter		Fiscal Year
Fiscal year ended March 31, 2013
Net sales	$	593,910	$	554,212	$	557,320	$	572,117	$	2,277,559
Gross profit		148,306		138,339		143,698		139,013		569,356
Operating earnings⁽¹⁾		70,255		62,885		59,737		56,991		249,868
Net earnings		45,564		43,011		38,677		37,706		164,958
Net earnings attributable to EnerSys stockholders		45,804		43,790		39,184		37,730		166,508
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.96	$	0.91	$	0.81	$	0.79	$	3.47
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.95	$	0.90	$	0.80	$	0.77	$	3.42
Fiscal year ended March 31, 2012
Net sales	$	569,229	$	547,140	$	574,246	$	592,754	$	2,283,369
Gross profit		121,971		114,395		130,876		145,463		512,705
Operating earnings⁽²⁾		48,715		42,440		53,777		65,879		210,811
Net earnings		33,496		28,289		36,859		45,323		143,967
Net earnings attributable to EnerSys stockholders		33,496		28,289		36,859		45,359		144,003
Net earnings per common share attributable to EnerSys stockholders—basic	$	0.67	$	0.57	$	0.77	$	0.95	$	2.95
Net earnings per common share attributable to EnerSys stockholders—diluted	$	0.66	$	0.57	$	0.77	$	0.94	$	2.93

(1)

Included in Operating earnings were restructuring charges of $370, $1,295, $3,776 and $1,723 for the first, second, third and fourth quarters of fiscal 2013, respectively.

(2)

Summary of Significant Accounting Policies - Additional Information (Detail) ₨ in Thousands, ¥ in Thousands, $ in Thousands	12 Months Ended
	Mar. 31, 2013 USD ($) shares	Mar. 31, 2013 INR (₨)	Mar. 31, 2013 CNY (¥)	Mar. 31, 2012 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents include all highly liquid investments with an original maturity, when purchased, in months	3 months
Convertible Notes	$ 172,500			$ 172,500
Recognizes the largest amount of the benefit that is greater realized upon ultimate settlement, percentage	50.00%
2011 Senior Secured Revolving Credit Facility
Summary Of Significant Accounting Policies [Line Items]
Fair value of Company's new senior secured revolving credit facility	$ 350,000
China Term Loan due 2017
Summary Of Significant Accounting Policies [Line Items]
Fair value of Company's new senior secured revolving credit facility \| ¥			¥ 75,000
India Term Loan due 2017
Summary Of Significant Accounting Policies [Line Items]
Fair value of Company's new senior secured revolving credit facility \| ₨		₨ 273,780
Senior Unsecured 3.375% Convertible Notes Due 2038
Summary Of Significant Accounting Policies [Line Items]
Convertible Notes	$ 172,500
Interest rate of debt instrument	3.375%	3.375%	3.375%
Restricted Stock and Restricted Stock Units
Summary Of Significant Accounting Policies [Line Items]
Percentage of restricted stock units granted, vested per year	25.00%
Vesting period, in years	4 years
Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of investment ownership, consolidated	50.00%	50.00%	50.00%
Percentage of investment ownership, equity method	20.00%	20.00%	20.00%
Estimated useful lives of finite-lived assets	3 years
Market share units converted into common stock for each unit \| shares	0
Minimum \| Reserve Power Batteries
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period	1 year
Minimum \| Motive Power Batteries
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period	1 year
Minimum \| Land, Buildings and Improvements
Summary Of Significant Accounting Policies [Line Items]
Property, plant, and equipment, useful life	10 years
Minimum \| Machinery and Equipment
Summary Of Significant Accounting Policies [Line Items]
Property, plant, and equipment, useful life	3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Percentage of investment ownership, equity method	50.00%	50.00%	50.00%
Percentage of investment ownership, cost method	20.00%	20.00%	20.00%
Estimated useful lives of finite-lived assets	20 years
Market share units converted into common stock for each unit \| shares	2
Maximum \| Reserve Power Batteries
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period	20 years
Maximum \| Motive Power Batteries
Summary Of Significant Accounting Policies [Line Items]
Product warranty for a period	7 years
Maximum \| Land, Buildings and Improvements
Summary Of Significant Accounting Policies [Line Items]
Property, plant, and equipment, useful life	33 years
Maximum \| Machinery and Equipment
Summary Of Significant Accounting Policies [Line Items]
Property, plant, and equipment, useful life	15 years

Acquisitions - Additional Information (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2013 USD ($) Entity	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($) Entity
Business Acquisition [Line Items]
Number of acquisitions \| Entity	4		3
Combined net purchase price	$ 23,553		$ 32,200
Goodwill relating to acquisitions	16,764	$ 16,399
Trademarks
Business Acquisition [Line Items]
Acquired intangible assets	2,000		1,774
Noncompete Agreements
Business Acquisition [Line Items]
Acquired intangible assets	500
Customer Relationships
Business Acquisition [Line Items]
Acquired intangible assets	3,400		3,547
Technology
Business Acquisition [Line Items]
Acquired intangible assets	$ 4,265		2,741
Acquired Companies
Business Acquisition [Line Items]
Goodwill relating to acquisitions			$ 15,342

Summary of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Schedule of Inventory [Line Items]
Raw materials	$ 88,787	$ 100,538
Work-in-process	113,119	111,629
Finished goods	152,035	149,607
Total	$ 353,941	$ 361,774

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Inventory Disclosure [Line Items]
Inventory reserves for obsolescence and other estimated losses	$ 17,372	$ 14,831

The amount of the valuation account as of the balance sheet date which reduces the carrying amount of inventory to net realizable value; takes into consideration such factors as market value, excessive quantities based on expected sales, technological obsolescence, and shrinkage. May also provide for estimated product returns or price concessions pertaining to product cost.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.BB)
-URI http://asc.fasb.org/extlink&oid=6386940&loc=d3e100047-122729

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6386567&loc=d3e3927-108312

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Paragraph 8, 9, 14
-Chapter 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Section A
-Paragraph 9
-Chapter 3
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

Summary of Property Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Property, Plant and Equipment [Line Items]
Land, buildings, and improvements	$ 206,610	$ 201,038
Machinery and equipment	528,546	511,599
Construction in progress	25,139	29,779
Property, Plant and Equipment, Gross, Total	760,295	742,416
Less accumulated depreciation	(410,169)	(389,201)
Total	$ 350,126	$ 353,215	$ 344,385

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

Property Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Property, Plant, and Equipment Disclosure [Line Items]
Depreciation expense	$ 47,876	$ 48,532	$ 43,517
Interest capitalized	$ 619	$ 797	$ 1,292

Schedule of Companys Other Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Intangible Assets [Line Items]
Gross Amount, Total	$ 112,786	$ 113,550
Accumulated Amortization ,Total	(9,085)	(6,468)
Net Amount ,Total	103,701	107,082
Trademarks
Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross Amount	86,298	86,745
Finite-lived intangible assets, Gross Amount	2,004	2,003
Indefinite-lived intangible assets, Accumulated Amortization	(953)	(953)
Finite-lived intangible assets, Accumulated Amortization	(727)	(643)
Indefinite-lived intangible assets, Net Amount	85,345	85,792
Finite-lived intangible assets, Net Amount	1,277	1,360
Customer Relationships
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	14,016	14,330
Finite-lived intangible assets, Accumulated Amortization	(3,994)	(2,839)
Finite-lived intangible assets, Net Amount	10,022	11,491
Noncompete Agreements
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	2,558	2,602
Finite-lived intangible assets, Accumulated Amortization	(1,524)	(1,224)
Finite-lived intangible assets, Net Amount	1,034	1,378
Patents
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	5,383	5,230
Finite-lived intangible assets, Accumulated Amortization	(1,237)	(615)
Finite-lived intangible assets, Net Amount	4,146	4,615
Licensing Agreements
Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	2,527	2,640
Finite-lived intangible assets, Accumulated Amortization	(650)	(194)
Finite-lived intangible assets, Net Amount	$ 1,877	$ 2,446

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]
Amortization expense, related to finite-lived intangible assets	$ 2,626	$ 1,828	$ 876
Expected amortization expense, 2014	2,160
Expected amortization expense, 2015	2,045
Expected amortization expense, 2016	2,013
Expected amortization expense, 2017	1,799
Expected amortization expense, 2018	1,432
Noncontrolling interests	5,882	8,620
Goodwill	345,499	352,737	$ 343,666
Estimated tax-deductible goodwill	10,444	$ 12,745
Restatement Adjustment
Goodwill and Intangible Assets Disclosure [Line Items]
Noncontrolling interests	5,676
Goodwill	5,676
Nonredeemable noncontrolling interests	$ 4,106

Schedule of Changes in Carrying Amount of Goodwill by Business Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Goodwill [Line Items]
Balance at beginning of year	$ 352,737	$ 343,666
Goodwill acquired during the year	16,764	16,399
Adjustments related to the finalization of purchase accounting for prior year acquisitions	365	379
Foreign currency translation adjustment	(7,603)	(7,707)
Balance at end of year	345,499	352,737
Europe
Goodwill [Line Items]
Balance at beginning of year	173,442	177,881
Goodwill acquired during the year		3,164
Adjustments related to the finalization of purchase accounting for prior year acquisitions	155	374
Foreign currency translation adjustment	(6,889)	(7,977)
Balance at end of year	166,708	173,442
Americas
Goodwill [Line Items]
Balance at beginning of year	150,754	143,225
Goodwill acquired during the year		7,973
Adjustments related to the finalization of purchase accounting for prior year acquisitions	230	5
Foreign currency translation adjustment	(953)	(449)
Balance at end of year	150,031	150,754
Asia
Goodwill [Line Items]
Balance at beginning of year	28,541	22,560
Goodwill acquired during the year		5,262
Adjustments related to the finalization of purchase accounting for prior year acquisitions	(20)
Foreign currency translation adjustment	239	719
Balance at end of year	$ 28,760	$ 28,541

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 43
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 72
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph e
-Clause 1
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 68
-Subparagraph l
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 34
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Schedule of Prepaid and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Other Assets, Current [Line Items]
Prepaid non-income taxes	$ 27,525	$ 23,737
Prepaid income taxes	16,145	7,716
Non-trade receivables	6,096	8,247
Other	14,053	12,693
Total	$ 63,819	$ 52,393

Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Schedule of Accrued Liabilities [Line Items]
Payroll and benefits	$ 52,484	$ 55,595
Accrued selling expenses	28,896	26,269
Warranty	20,079	19,274
Income taxes payable	19,273	16,979
Freight	11,768	12,314
VAT and other non-income taxes	10,438	10,966
Deferred income	7,789	12,057
Lead forward contracts	2,832
Interest	2,171	2,040
Pension and social security	1,787	1,696
Restructuring	1,959	1,186
Interest rate swaps	654	3,628
Other	31,534	26,399
Total	$ 191,664	$ 188,403

Long Term Debt (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 155,273	$ 239,129
Less current portion		2,540
Total long-term debt	155,273	236,589
Senior Unsecured 3.375% Convertible Notes Due 2038
Debt Instrument [Line Items]
Long-term debt	$ 155,273	148,272
2011 Credit Facility Due 2016
Debt Instrument [Line Items]
Long-term debt		79,400
China Term Loan due 2017
Debt Instrument [Line Items]
Long-term debt		6,034
India Term Loan due 2017
Debt Instrument [Line Items]
Long-term debt		5,383
Other
Debt Instrument [Line Items]
Long-term debt		$ 40

Long Term Debt (Parenthetical) (Detail)	12 Months Ended
Long Term Debt (Parenthetical) (Detail)	Mar. 31, 2013
Senior Unsecured 3.375% Convertible Notes Due 2038
Debt Instrument [Line Items]
Interest rate of debt instrument	3.375%
Maturity year	2038
2011 Credit Facility Due 2016
Debt Instrument [Line Items]
Maturity year	2016
China Term Loan due 2017
Debt Instrument [Line Items]
Maturity year	2017
India Term Loan due 2017
Debt Instrument [Line Items]
Maturity year	2017

Debt - Additional Information (Detail) $ / shares in Units, ₨ in Thousands, ¥ in Thousands	1 Months Ended	12 Months Ended
	May 28, 2008 USD ($)	Mar. 31, 2013 USD ($) yr $ / shares shares	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Mar. 31, 2013 INR (₨)	Mar. 31, 2013 CNY (¥)
Debt Instrument [Line Items]
Senior secured revolving credit facility, initiation date		Mar. 29, 2011
Liquidity test required to be met		February 2015
Capacity to meet potential obligations related to Convertible Notes		June 2015
Company owned capital stock percentage		65.00%
Short term borrowing outstanding amount		$ 22,702,000	$ 16,042,000
Conversion price per share \| $ / shares		$ 40.60
Amortized remaining discount period		26 months
Aggregate consideration on conversion shares \| shares		4,248,761
Short-term debt, weighted-average interest rates		9.00%	9.00%		9.00%	9.00%
Write-off of unamortized deferred financing fees				$ 2,308,000
New deferred financing fees				3,500,000
Deferred financing fees, net of accumulated amortization		$ 3,355,000	$ 4,634,000
Amortization expense included in interest expense		$ 1,279,000	1,278,000	1,861,000
Option Two \| Libor Rate
Debt Instrument [Line Items]
Interest at a floating rate		1.00%			1.00%	1.00%
Option Two \| Federal Funds Rate
Debt Instrument [Line Items]
Interest at a floating rate		0.25%			0.25%	0.25%
2011 Senior Secured Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 350,000,000
Maturity date		Mar. 31, 2016
2011 Senior Secured Revolving Credit Facility \| Option One
Debt Instrument [Line Items]
Interest on borrowings at a floating rate		("LIBOR") plus an applicable percentage (currently 1.25%)
2011 Senior Secured Revolving Credit Facility \| Option Two
Debt Instrument [Line Items]
Interest on borrowings at a floating rate		The greater of the Federal Funds rate plus 0.50% or the prime rate, or one-month LIBOR plus 1.0%, plus an applicable percentage (currently 0.25%)
Applicable Percentage \| Option One \| Libor Rate
Debt Instrument [Line Items]
Interest at a floating rate		1.25%			1.25%	1.25%
Applicable Percentage \| Option Two \| Libor Rate
Debt Instrument [Line Items]
Interest at a floating rate		0.50%			0.50%	0.50%
Secured Debt
Debt Instrument [Line Items]
Interest rate of debt instrument		0.00%			0.00%	0.00%
China Term Loan due 2017
Debt Instrument [Line Items]
Maximum borrowing capacity \| ¥						¥ 75,000
Term loan (in years) \| yr		6
India Term Loan due 2017
Debt Instrument [Line Items]
Maximum borrowing capacity \| ₨					₨ 273,780
Short term borrowing outstanding amount		$ 15,077,000
Debt instrument maturity year		2017			2017	2017
Convertible Notes Payable
Debt Instrument [Line Items]
Maturity date		Jun. 01, 2038
Interest rate of debt instrument		3.375%			3.375%	3.375%
Face value of debt instrument	$ 172,500,000	$ 172,500,000	172,500,000
Debt instrument maturity year		2038			2038	2038
Net proceeds received after deduction of commissions and offering expenses	$ 168,200,000
Semi-annual payment of interest in arrears		June 1 and December 1
Initial conversion rate \| shares		24.6305
Principal amount of Convertible Notes		$ 1,000
Conversion price per share \| $ / shares		$ 40.60
Redemption price percentage of debt instrument of accreted principal amount		100.00%
Minimum price of Common Stock per share for eligibility of make-whole premium payment \| $ / shares		$ 29.00
Interest rate percentage		8.50%			8.50%	8.50%
Amount of interest cost recognized for the amortization of the discount		$ 7,001,000	6,435,000	5,917,000
Available lines of credit		469,123,000	377,230,000
Outstanding amount		120,373,000	95,340,000
Stand by letters of credit		$ 11,854,000	9,108,000
Senior Unsecured 3.375% Convertible Notes Due 2038
Debt Instrument [Line Items]
Interest rate of debt instrument		3.375%			3.375%	3.375%
Debt instrument maturity year		2038			2038	2038
Interest paid		$ 10,056,000	$ 8,933,000	$ 16,101,000

Components of Net Carrying Amount of Convertible Notes (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Debt Instrument [Line Items]
Net carrying amount	$ 155,273	$ 239,129
Convertible Notes Payable
Debt Instrument [Line Items]
Principal	172,500	172,500
Unamortized discount	(17,227)	(24,228)
Net carrying amount	155,273	148,272
Carrying amount of equity component	$ 29,850	$ 29,850

Schedule of Capital and Operating Leases (Detail) $ in Thousands	Mar. 31, 2013 USD ($)
Leases Disclosure [Line Items]
2014, Capital Leases	$ 330
2015, Capital Leases	130
2016, Capital Leases	48
2017, Capital Leases	27
2018, Capital Leases	14
Thereafter, Capital Leases
Total minimum Lease payments, Capital Leases	549
Amounts representing interest	34
Net minimum lease payments, including current portion of $311	515
2014, Operating Leases	19,433
2015, Operating Leases	14,129
2016, Operating Leases	10,312
2017, Operating Leases	6,793
2018, Operating Leases	4,714
Thereafter, Operating Leases	8,606
Total minimum lease payments, Operating Leases	$ 63,987

Schedule of Capital and Operating Leases (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Leases Disclosure [Line Items]
Net minimum lease payments, including current portion	$ 311	$ 409

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.

Leases - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Leases Disclosure [Line Items]
Rental expense	$ 33,090	$ 31,619	$ 28,047

Schedule of Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Schedule of Other Liabilities [Line Items]
Pension and profit sharing obligation	$ 34,554	$ 30,752
Warranty	22,512	22,793
Long-term income taxes liabilities	17,165	13,520
Deferred income	6,285	6,094
Interest rate swap liabilities		244
Other	9,902	19,065
Total	$ 90,418	$ 92,468

This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement and postemployment benefit plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ (3,497)	$ (3,941)
Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(654)	(3,872)
Lead hedge forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(2,832)	(851)
Foreign currency forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(11)	782
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(3,497)	(3,941)
Significant Other Observable Inputs (Level 2) \| Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(654)	(3,872)
Significant Other Observable Inputs (Level 2) \| Lead hedge forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(2,832)	(851)
Significant Other Observable Inputs (Level 2) \| Foreign currency forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ (11)	$ 782

Fair Value of Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Conversion option price per share	$ 40.60
Convertible Notes Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of debt instrument		$ 172,500,000
Price of stock per share when convertible notes were issued		$ 30.19
Closing price of stock		45.58
Conversion option price per share		$ 40.60
Trading of convertible notes, face value, disclosed as a percentage	126.00%	116.00%

Carrying Amounts and Estimated Fair Values of Company Financial Instruments (Detail) - USD ($)
$ in Thousands

Mar. 31, 2013

Mar. 31, 2012

^[1]

$ 241

$ 812

Derivatives assets, Carrying Amount

^[1]

3,738

4,753

^[1]

241

812

Derivatives liabilities, Carrying Amount

^[1]

3,738

4,753

Convertible Notes Payable

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Convertible Notes, Fair Value

^[2]

155,273

148,272

Convertible Notes, Carrying Amount

^[3]

$ 217,350

$ 200,100

[1]	Represents interest rate swap agreements, lead and foreign currency hedges (see Note 12 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at March 31, 2013 and March 31, 2012).
[2]	The fair value amounts of the Convertible Notes represent the trading values of the Convertible Notes with a principal value of $172,500 at March 31, 2013 and March 31, 2012.
[3]	The carrying amounts of the Convertible Notes at March 31, 2013 and March 31, 2012 represent the $172,500 principal value, less the unamortized debt discount (see Note 8).

Carrying Amounts and Estimated Fair Values of Company Financial Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012	May 28, 2008
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Notes	$ 172,500	$ 172,500
Convertible Notes Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of debt instrument	$ 172,500	$ 172,500	$ 172,500

Derivative Financial Instruments - Additional Information (Detail) $ in Thousands, £ in Millions	12 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2012 USD ($)	Mar. 31, 2013 GBP (£)	Mar. 31, 2012 GBP (£)
Derivatives, Fair Value [Line Items]
Foreign currency forward contracts	$ 51,366	$ 42,121
Foreign currency contract, maturity	1 year
Interest rate swap agreements converted into fixed rate basis	$ 65,000	85,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Change in fair value recorded in other (income) expense, net	101	977
(Gain) Loss Recognized in Income on Derivatives	(2,496)	1,083
Cost of Sales
Derivatives, Fair Value [Line Items]
Derivative gain (loss) to be recorded in income within 12 months, before tax	$ 1,389
Interest rate swap agreements
Derivatives, Fair Value [Line Items]
Derivative, maturity date	May 01, 2013
Interest rate swap agreements \| Other (Income) Expense \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
(Gain) Loss Recognized in Income on Derivatives	$ 101	977
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Notional amount \| £			£ 56.3	£ 60.0
Hedge forward contracts, maturity	1 year		1 year
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	$ 21,749	11,410
Foreign currency forward contracts \| Other (Income) Expense \| Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
(Gain) Loss Recognized in Income on Derivatives	$ (2,597)	$ 106

Fair Value of Derivative Instruments (Detail) - USD ($)
$ in Thousands

Mar. 31, 2013

Mar. 31, 2012

^[1]

$ 241

$ 812

Designated as Hedging Instrument

^[1]

3,738

4,753

700

Designated as Hedging Instrument | Prepaid and other current assets | Foreign currency forward contracts

3,084

881

Designated as Hedging Instrument | Other assets | Lead hedge forward contracts

670

Designated as Hedging Instrument | Accrued expenses | Lead hedge forward contracts

Designated as Hedging Instrument | Accrued expenses | Foreign currency forward contracts

2,832

881

Not Designated as Hedging Instrument

252

241

112

Not Designated as Hedging Instrument | Prepaid and other current assets | Foreign currency forward contracts

654

3,872

Not Designated as Hedging Instrument | Accrued expenses | Interest rate swap agreements

241

112

Not Designated as Hedging Instrument | Other liabilities | Interest rate swap agreements

$ 654

3,628

$ 244

[1]	Represents interest rate swap agreements, lead and foreign currency hedges (see Note 12 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at March 31, 2013 and March 31, 2012).

Effect of Derivative Instruments on Consolidated Condensed Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Dedesignated As Hedging Instrument
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 1,871	$ (9,883)	$ 9,064
Gain (Loss) Reclassified from AOCI (Effective Portion)	5,012	(4,713)	190
Dedesignated As Hedging Instrument \| Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	1,623	(9,731)	15,930
Dedesignated As Hedging Instrument \| Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	248	(152)	(4,031)
Dedesignated As Hedging Instrument \| Interest rate swap agreements
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			(2,835)
Dedesignated As Hedging Instrument \| Cost of Sales \| Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	3,309	(831)	6,417
Dedesignated As Hedging Instrument \| Cost of Sales \| Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	$ 1,703	$ (3,882)	471
Dedesignated As Hedging Instrument \| Interest Expense \| Interest Rate Contract
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)			(6,698)
Not Designated as Hedging Instrument \| Charges Related To Refinancing \| Interest Rate Contract
Derivatives, Fair Value [Line Items]
Location of Gain (Loss) Recognized in Income on Derivative			$ (5,847)

Effect of Derivative Instruments (Detail) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ 2,496	$ (1,083)
Other (Income) Expense \| Interest rate swap agreements
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(101)	(977)
Other (Income) Expense \| Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ 2,597	$ (106)

Income Tax Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
Income Tax Expense (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax [Line Items]
Federal, Current	$ 38,480	$ 30,459	$ 24,232
State, Current	5,684	3,778	2,736
Foreign, Current	19,438	16,282	14,114
Total current	63,602	50,519	41,082
Federal, Deferred	3,915	(1,609)	(1,358)
State, Deferred	214	(962)	2,010
Foreign, Deferred	(2,456)	(656)	(3,716)
Total deferred	1,673	(3,227)	(3,064)
Income tax expense	$ 65,275	$ 47,292	$ 38,018

Earning Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax [Line Items]
United States	$ 107,191	$ 87,597	$ 57,710
Foreign	123,042	103,662	93,734
Earnings before income taxes	$ 230,233	$ 191,259	$ 151,444

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax Contingency [Line Items]
Income taxes paid	$ 64,210	$ 38,482	$ 41,800
United States federal net operating loss carryforwards	3,213
Limited by Internal Revenue Code	$ 3,213
Operating loss carryforwards, expiration date	2023
Net operating loss carryforwards foreign subsidiaries	$ 235,623
Operating loss carryforwards, life period, years	20 years
Net operating loss carryforwards for state tax purposes	$ 35,751
Net operating loss carryforwards, state expiration period, years	20 years
Valuation allowance	$ 793
Tax benefits due to the utilization of net operating loss carryforwards	$ 1,866	$ 2,940
Effective income tax rates	28.40%	24.70%	25.10%
Undistributed earnings of foreign subsidiaries	$ 598,500
Balance of unrecognized tax benefits recognized, period	12 months
Tax related interest and penalties	$ 680	$ 575
Foreign
Income Tax Contingency [Line Items]
Valuation allowance associated with certain foreign and state tax jurisdictions	52,781	53,206
State
Income Tax Contingency [Line Items]
Valuation allowance associated with certain foreign and state tax jurisdictions	$ 1,761	$ 2,360

Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Accounts receivable	$ 660	$ 1,111
Inventories	4,345	6,707
Net operating loss carryforwards	67,834	71,773
Accrued expenses	32,773	26,997
Other assets	9,703	10,228
Gross deferred tax assets	115,315	116,816
Less valuation allowance	(54,542)	(56,359)
Total deferred tax assets	60,773	60,457
Property, plant and equipment	28,985	30,957
Other intangible assets	48,142	46,628
Convertible Notes	22,386	21,616
Other liabilities	865	2,400
Total deferred tax liabilities	100,378	101,601
Net deferred tax liabilities	$ (39,605)	$ (41,144)

Reconciliation of Income Taxes at Statutory Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax [Line Items]
United States statutory income tax expense (at 35%)	$ 80,581	$ 66,962	$ 53,005
State income taxes, net of federal effect	3,742	1,592	3,035
Nondeductible expenses, domestic manufacturing deduction and other	7,664	1,587	(1,848)
Effect of foreign operations	(27,883)	(20,028)	(14,841)
Valuation allowance	1,171	(2,821)	(1,333)
Income tax expense	$ 65,275	$ 47,292	$ 38,018

Reconciliation of Income Taxes at Statutory Rate (Parenthetical) (Detail)	12 Months Ended
	Mar. 31, 2013
Income Tax [Line Items]
United States statutory income tax expense rate percentage	35.00%

Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Tax [Line Items]
Unrecognized tax benefits, beginning balance	$ 12,945	$ 10,645	$ 10,750
Increases related to current year tax positions	6,296	5,032	2,896
Increases related to prior year tax positions	969	182	324
Increases related to prior year tax positions due to foreign currency translation	245		122
Decreases related to prior year tax positions due to foreign currency translation		(28)
Decreases related to prior year tax position settled			(3,145)
Lapse of statute of limitations	(3,970)	(2,886)	(302)
Unrecognized tax benefits, ending balance	$ 16,485	$ 12,945	$ 10,645

Net Periodic Benefit Cost Related to Defined Benefit Pension Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 349	$ 285	$ 250
Interest cost	649	668	646
Expected return on plan assets	(756)	(706)	(624)
Amortization and deferral	393	238	248
Net periodic benefit cost	635	485	520
International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	679	645	603
Interest cost	2,377	2,504	2,503
Expected return on plan assets	(1,851)	(1,787)	(1,615)
Amortization and deferral	209	32	53
Net periodic benefit cost	$ 1,414	$ 1,394	$ 1,544

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512136

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Glossary Expected Return on Plan Assets
-URI http://asc.fasb.org/extlink&oid=6512171

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(3)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Service Cost (Component of Net Periodic Pension Cost)
-URI http://asc.fasb.org/extlink&oid=6525008

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph a, h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Summary of Change in Plant Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at the beginning of the period	$ 14,040	$ 11,903
Service cost	349	285	$ 250
Interest cost	649	668	646
Benefits paid, inclusive of plan expenses	(664)	(615)
Experience loss	1,537	1,799
Benefit obligation at the end of the period	15,911	14,040	11,903
Fair value of plan assets at the beginning of the period	9,192	8,746
Actual return on plan assets	843	420
Employer contributions	963	641
Benefits paid, inclusive of plan expenses	(664)	(615)
Fair value of plan assets at the end of the period	10,334	9,192	8,746
Funded status deficit	(5,577)	(4,848)
International Plans
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at the beginning of the period	53,895	48,881
Service cost	679	645	603
Interest cost	2,377	2,504	2,503
Benefits paid, inclusive of plan expenses	(1,667)	(1,709)
Plan settlements		(40)
Experience loss	7,099	5,442
Foreign currency translation adjustment	(2,507)	(1,828)
Benefit obligation at the end of the period	59,876	53,895	48,881
Fair value of plan assets at the beginning of the period	26,942	25,779
Actual return on plan assets	4,024	1,555
Employer contributions	1,639	1,505
Benefits paid, inclusive of plan expenses	(1,667)	(1,709)
Plan settlements		(40)
Foreign currency translation adjustment	(1,470)	(148)
Fair value of plan assets at the end of the period	29,468	26,942	$ 25,779
Funded status deficit	$ (30,408)	$ (26,953)

Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan amounts recognized in balance sheet	$ (35,985)	$ (31,801)
Other assets
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan amounts recognized in balance sheet		260
Accrued expenses
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan amounts recognized in balance sheet	(1,431)	(1,309)
Other liabilities
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan amounts recognized in balance sheet	$ (34,554)	$ (30,752)

Pension Components Before Tax and Related Changes Net of Tax Recognized in AOCI (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	$ (816)	$ (922)	$ (1,054)
Net loss	(16,645)	(11,176)	(3,712)
Net amount recognized	$ (17,461)	$ (12,098)	$ (4,766)

The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Glossary Prior Service Cost
-URI http://asc.fasb.org/extlink&oid=6521920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (j)
-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Glossary Prior Service Cost
-URI http://asc.fasb.org/extlink&oid=6521884

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 158
-Paragraph 7
-Subparagraph c
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph i
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Summary Changes in Plan Assets and Benefit Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Changes in plan assets and benefit obligations:
New prior service cost			$ 905
Net loss (gain) arising during the year	$ 6,376	$ 7,757	(3,505)
Effect of exchange rates on amounts included in AOCI	(392)	(176)	151
Amounts recognized as a component of net periodic benefit costs:
Amortization of prior service cost	(79)	(83)	(62)
Amortization or settlement recognition of net loss	(523)	(187)	(250)
Total recognized in other comprehensive income	$ 5,382	$ 7,311	$ (2,761)

The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Plan Curtailment
-URI http://asc.fasb.org/extlink&oid=6520938

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(7)
-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 30
-Section 15
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 132R
-Paragraph 5
-Subparagraph h
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 106
-Paragraph 518
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 87
-Paragraph 264
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 88
-Paragraph 6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Summary of Recognized Components of Net Periodic Pension Cost Included in Accumulated Other Comprehensive Income (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Net loss	$ (866)
Prior service cost	(78)
Net amount expected to be recognized	$ (944)

Summary of Accumulated Benefit Obligation Related to All Defined Pension Plans (Detail) - USD ($) $ in Thousands	Mar. 31, 2013	Mar. 31, 2012
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 15,911	$ 14,040
Accumulated benefit obligation	15,911	14,040
Fair value of plan assets	10,334	9,192
United States Plans \| Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	15,911	14,040
United States Plans \| Defined Benefit Plans With An Accumulated Benefit Obligation In Excess Of The Fair Value Of Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	15,911	14,040
Accumulated benefit obligation	15,911	14,040
Fair value of plan assets	10,334	9,192
International Plans
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	59,876	28,003
Accumulated benefit obligation	56,135	26,445
Fair value of plan assets	29,468	789
International Plans \| Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	56,135	50,416
International Plans \| Unfunded Defined Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	28,444	26,892
Accumulated benefit obligation	27,032	25,508
International Plans \| Defined Benefit Plans With An Accumulated Benefit Obligation In Excess Of The Fair Value Of Plan Assets
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	29,571	28,003
Accumulated benefit obligation	27,985	26,445
Fair value of plan assets	$ 777	$ 789

Significant Assumptions Used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.80%	5.70%	6.00%
Expected return on plan assets	8.00%	8.00%	8.00%
International Plans \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.50%	4.00%	4.30%
Expected return on plan assets	5.50%	5.50%	5.50%
Rate of compensation increase	2.00%	2.00%	2.00%
International Plans \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	5.50%	6.00%
Expected return on plan assets	7.00%	7.00%	7.00%
Rate of compensation increase	4.00%	4.00%	3.50%

Significant Assumptions Used to Determine Projected Benefit Obligations (Detail)	Mar. 31, 2013	Mar. 31, 2012
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.00%	4.80%
Expected return on plan assets	8.00%	8.00%
International Plans \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	2.50%	2.50%
Expected return on plan assets	4.00%	5.50%
Rate of compensation increase	2.00%	2.00%
International Plans \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.40%	5.50%
Expected return on plan assets	7.00%	7.00%
Rate of compensation increase	4.00%	4.00%

Retirement Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Extended terms of return on portfolio investment, minimum	3 years
Extended terms of return on portfolio investment, maximum	5 years
Expected cash contributions to pension plans in 2014	$ 2,226
Defined Contribution Pension
Defined Benefit Plan Disclosure [Line Items]
Employer expenses	$ 5,191	$ 5,146	$ 5,025
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Equity investments target range, minimum	50.00%
Equity investments target range, maximum	70.00%

Summary of Pension Plan Investments Measured at Fair Value (Detail) - USD ($)
$ in Thousands

Mar. 31, 2013

Mar. 31, 2012

Mar. 31, 2011

United States Plans

United States Plans | Quoted Price in Active Markets for Identical Assets (Level 1)

$ 10,334

$ 9,192

$ 8,746

United States Plans | Cash and Cash Equivalents

10,334

9,192

United States Plans | Cash and Cash Equivalents | Quoted Price in Active Markets for Identical Assets (Level 1)

1,454

868

1,454

868

United States Plans | US

United States Plans | US | Quoted Price in Active Markets for Identical Assets (Level 1)

^[1]

5,346

5,067

United States Plans | International Equity Securities

^[1]

5,346

5,067

United States Plans | International Equity Securities | Quoted Price in Active Markets for Identical Assets (Level 1)

^[2]

905

837

United States Plans | Fixed Income Funds

^[2]

905

837

United States Plans | Fixed Income Funds | Quoted Price in Active Markets for Identical Assets (Level 1)

^[3]

2,629

2,420

^[3]

2,629

2,420

International Plans

International Plans | Quoted Price in Active Markets for Identical Assets (Level 1)

29,468

26,942

$ 25,779

29,468

26,942

International Plans | US

International Plans | US | Quoted Price in Active Markets for Identical Assets (Level 1)

^[1]

2,856

2,742

International Plans | International Equity Securities

^[1]

2,856

2,742

International Plans | International Equity Securities | Quoted Price in Active Markets for Identical Assets (Level 1)

^[2]

15,617

14,728

International Plans | Fixed Income Funds

^[2]

15,617

14,728

International Plans | Fixed Income Funds | Quoted Price in Active Markets for Identical Assets (Level 1)

^[3]

10,995

9,472

^[3]

$ 10,995

$ 9,472

[1]	US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.
[2]	International equities are invested in companies that are traded on exchanges outside the U.S. and are well diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.
[3]	Fixed income consists primarily of investment grade bonds from diversified industries.

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

Summary of Estimated Future Benefit Payments (Detail) $ in Thousands	Mar. 31, 2013 USD ($)
Defined Benefit Plan Disclosure [Line Items]
2014	$ 2,486
2015	2,253
2016	2,464
2017	2,888
2018	2,872
Years 2019-2023	$ 17,519

Stockholders Equity and Noncontrolling Interests - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stockholders Equity [Line Items]
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, par value	$ 0.01	$ 0.01
Number of shares of common stock purchased	683,192	2,646,885
Repurchased common stock value	$ 22,593	$ 58,383
Treasury stock, shares	5,130,077	4,446,885
Percentage of noncontrolling interest acquired	40.00%
Redeemable noncontrolling interests recognized in acquisitions of Powertech Batteries and Energy Leader Batteries India Limited	$ 2,131	$ 9,916
Maximum
Stockholders Equity [Line Items]
Preferred stock, shares authorized	1,000,000

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Change in Number of Shares of Common Stock Outstanding (Detail) - shares	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stockholders Equity [Line Items]
Shares outstanding, beginning balance	47,800,129	50,034,353	48,581,832
Purchase of treasury stock	(683,192)	(2,646,885)
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes	723,267	412,661	1,452,521
Shares outstanding, ending balance	47,840,204	47,800,129	50,034,353

Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stockholders Equity [Line Items]
Pension funded status adjustment, Beginning Balance	$ (8,982)	$ (3,512)	$ (5,479)
Unrealized gain (loss) on derivative instruments, Beginning Balance	1,175	4,436	(5,034)
Foreign currency translation adjustment, Beginning Balance	81,900	114,256	77,717
Accumulated other comprehensive income, Beginning Balance	74,093	115,180	67,204
Pension funded status adjustment, Before-Tax Amount	(5,382)	(7,311)	2,761
Unrealized gain (loss) on derivative instruments, Before-Tax Amount	(3,141)	(5,170)	14,721
Foreign currency translation adjustment, Before-Tax Amount	(27,244)	(32,356)	36,539
Accumulated other comprehensive income, Before-Tax Amount	(35,767)	(44,837)	54,021
Pension funded status adjustment, Tax Benefit (Expense)	1,195	1,841	(794)
Unrealized gain (loss) on derivative instruments, Tax Benefit (Expense)	1,134	1,909	(5,251)
Foreign currency translation adjustment, Tax Benefit (Expense)
Accumulated other comprehensive income, Tax Benefit (Expense)	2,329	3,750	(6,045)
Pension funded status adjustment, Net-of-Tax Amount	(4,187)	(5,470)	1,967
Unrealized gain (loss) on derivative instruments, Net-of-Tax Amount	(2,007)	(3,261)	9,470
Foreign currency translation adjustment, Net-of-Tax Amount	(27,244)	(32,356)	36,539
Accumulated other comprehensive income, Net-of-Tax Amount	(33,438)	(41,087)	47,976
Pension funded status adjustment, Ending Balance	(13,169)	(8,982)	(3,512)
Unrealized gain (loss) on derivative instruments, Ending Balance	(832)	1,175	4,436
Foreign currency translation adjustment, Ending Balance	54,656	81,900	114,256
Accumulated other comprehensive income, Ending Balance	$ 40,655	$ 74,093	$ 115,180

Redeemable Noncontrolling Interests (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Redeemable noncontrolling interests, beginning balance	$ 9,782
Redeemable noncontrolling interests recognized in acquisitions of Powertech Batteries and Energy Leader Batteries India Limited	2,131	$ 9,916
Net losses attributable to redeemable noncontrolling interests	(1,429)	(170)
Loan to equity conversion by redeemable noncontrolling interests	3,901
Foreign currency translation adjustment	(1,159)	36
Redeemable noncontrolling interests, ending balance	$ 11,095	$ 9,782

The aggregate amount to be paid by the entity upon redemption of the security that is classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

Stock Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2013 USD ($) mo yr $ / shares shares	Mar. 31, 2012 USD ($) $ / shares shares	Mar. 31, 2011 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	2,452,522
Stock-based compensation expense \| $	$ 97	$ 1,092	$ 2,333
Stock-based compensation expense, net of tax \| $	69	$ 822	$ 1,844
Unrecognized compensation expense associated with non-vested incentive awards outstanding \| $	$ 22,941
Expected weighted average period \| mo	19
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award \| $ / shares	$ 31.23
Stock unit grant during period	229,879
Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate		0.93%	1.30%
Dividend yield		0.00%	0.00%
Time of maturity, in years		3 years	3 years
Expected volatility		45.50%	43.00%
Restricted Shares Restricted Stock Units and Market Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $	$ 14,640	$ 10,493	$ 6,723
Stock unit grant during period	9,412	9,340	2,792
Equity-based compensation expense, tax benefit \| $	$ 4,105	$ 2,599	$ 1,659
Non Employee Directors \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units granted	21,328	35,632
Market price per unit of stock award \| $ / shares	$ 37.51	$ 22.45
Non Employee Directors \| Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award \| $ / shares	$ 41.36
Risk-free interest rate	0.37%
Dividend yield	0.00%
Time of maturity, in years	3 years
Expected volatility	39.08%
Management \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award \| $ / shares	$ 31.76	$ 35.79	$ 25.67
Stock unit grant during period	199,139	95,026	291,701
Management \| Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per unit of stock award \| $ / shares		$ 48.36	$ 34.45
Stock unit grant during period	303,942	224,397	124,091
Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	3,177,477
Stock Options Issued In Fiscal 2010 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expiration period (in years) \| yr	10

Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Number of options
Number of Options outstanding, Beginning Balance	633,663	860,779	2,431,233
Number of Options, Exercised		(227,116)	(1,415,391)
Number of Options, Canceled			(155,063)
Number of Options outstanding, Ending Balance		633,663	860,779	2,431,233
Number of Options, Exercised	(555,677)
Options expected to vest, Number of Options, Ending Balance	77,986
Options outstanding, Weighted Average Remaining Contract Term
Options exercised, Weighted Average Remaining Contract Term (Years)	0 years
Options exercisable, Weighted Average Remaining Contract Term (Years), Ending Balance	2 years 6 months	6 years 2 months 6 days	6 years 2 months 12 days	4 years
Weighted average exercise price
Options outstanding, Weighted Average Exercise Price, Beginning Balance	$ 20.85	$ 19.52	$ 17.69
Weighted Average Exercise Price, Exercised	21.70	15.82	15.34
Weighted Average Exercise Price, Canceled			29.32
Options outstanding, Weighted Average Exercise Price, Ending Balance	$ 14.76	$ 20.85	$ 19.52	$ 17.69
Aggregate intrinsic value
Options outstanding, Aggregate Intrinsic Value, Beginning Balance	$ 8,879	$ 17,129	$ 19,191
Aggregate Intrinsic Value, Exercised	8,860	3,691	18,482
Aggregate Intrinsic Value, Canceled			9
Options exercisable, Aggregate Intrinsic Value, Ending Balance	$ 2,404
Options outstanding, Aggregate Intrinsic Value, Ending Balance		$ 8,879	$ 17,129	$ 19,191

Summary of Information Regarding Stock Options Outstanding and Exercisable (Detail)	12 Months Ended
	Mar. 31, 2013 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options \| shares	77,986
Weighted Average Remaining Contractual Life	2 years 6 months
Weighted Average Exercise Price \| $ / shares	$ 14.76
$10.01-15.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options \| shares	65,954
Weighted Average Remaining Contractual Life	2 years 1 month 6 days
Weighted Average Exercise Price \| $ / shares	$ 14.12
$15.01-20.00
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Options \| shares	12,032
Weighted Average Remaining Contractual Life	4 years 1 month 6 days
Weighted Average Exercise Price \| $ / shares	$ 18.29

Summary of Changes of Non-Vested Options (Detail)	12 Months Ended
Summary of Changes of Non-Vested Options (Detail)	Mar. 31, 2013 $ / shares shares
Number of options
Nonvested, Number of Options, Beginning Balance \| shares	110,037
Number of Options, Vested \| shares	(110,037)
Weighted average grant-date fair value
Weighted Average Grant-Date Fair Value, Nonvested, Beginning Balance \| $ / shares	$ 7.87
Weighted Average Grant-Date Fair Value, Vested \| $ / shares	$ 7.87

Summary of Changes in Restricted Stock Units and Market Share Units (Detail)	12 Months Ended
	Mar. 31, 2013 $ / shares shares
Restricted Stock Units (RSUs)
Number of RSU and MSU
Number of RSU and MSU, Non-vested awards, Beginning Balance \| shares	617,240
Number of RSU and MSU, Granted \| shares	229,879
Number of RSU and MSU, Vested \| shares	(238,320)
Number of RSU and MSU, cancelled \| shares	(6,693)
Number of RSU and MSU, Non-vested awards, Ending Balance \| shares	602,106
Weighted average grant date fair value
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance \| $ / shares	$ 24.61
Weighted Average Grant Date Fair Value, Granted \| $ / shares	31.23
Weighted Average Grant Date Fair Value, Vested \| $ / shares	23.99
Weighted Average Grant Date Fair Value, Canceled \| $ / shares	32.01
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance \| $ / shares	$ 27.30
Market Share Unit Number (MSU)
Number of RSU and MSU
Number of RSU and MSU, Non-vested awards, Beginning Balance \| shares	346,563
Number of RSU and MSU, Granted \| shares	303,942
Number of RSU and MSU, cancelled \| shares	(20,466)
Number of RSU and MSU, Non-vested awards, Ending Balance \| shares	630,039
Weighted average grant date fair value
Weighted Average Grant Date Fair Value, Non-vested awards, Beginning Balance \| $ / shares	$ 43.38
Weighted Average Grant Date Fair Value, Granted \| $ / shares	41.36
Weighted Average Grant Date Fair Value, Canceled \| $ / shares	46.77
Weighted Average Grant Date Fair Value, Non-vested awards, Ending Balance \| $ / shares	$ 42.29

Weighted Average Common Shares Basic and Common Shares Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 30, 2012	Sep. 30, 2012	Jul. 01, 2012	Mar. 31, 2012	Jan. 01, 2012	Oct. 02, 2011	Jul. 03, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share Disclosure [Line Items]
Net earnings attributable to EnerSys stockholders	$ 37,730	$ 39,184	$ 43,790	$ 45,804	$ 45,359	$ 36,859	$ 28,289	$ 33,496	$ 166,508	$ 144,003	$ 113,426
Basic									48,022,005	48,748,205	49,376,132
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired									593,422	467,830	668,114
Convertible Notes	20,022								20,022
Diluted weighted-average number of common shares outstanding									48,635,449	49,216,035	50,044,246
Basic earnings per common share attributable to EnerSys stockholders	$ 0.79	$ 0.81	$ 0.91	$ 0.96	$ 0.95	$ 0.77	$ 0.57	$ 0.67	$ 3.47	$ 2.95	$ 2.30
Diluted earnings per common share attributable to EnerSys stockholders	$ 0.77	$ 0.80	$ 0.90	$ 0.95	$ 0.94	$ 0.77	$ 0.57	$ 0.66	$ 3.42	$ 2.93	$ 2.27
Anti-dilutive equity awards not included in diluted weighted-average common shares										221,097

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 260
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-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Number 128
-Paragraph 40
-Subparagraph c
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 13, 14
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Number 07-4
-Paragraph 4
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258

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-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256

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-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 18
-Article 7

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-Paragraph 36, 37, 38
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-Number 210
-Section 03
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-Article 5

Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
-Section 04
-Paragraph 21
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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 944
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-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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-Name Accounting Standards Codification
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-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e565-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph d
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A7
-Appendix A

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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-Name Emerging Issues Task Force (EITF)
-Number 87-21
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 19
-Article 5

Reference 14: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Emerging Issues Task Force (EITF)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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Earnings Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2012
Earnings Per Share Disclosure [Line Items]
Convertible Notes	$ 172,500	$ 172,500	$ 172,500
Number of common shares issue upon conversion		4,248,761
Average price of common stock	$ 41.38	$ 41.38
Convertible notes conversion price	$ 40.60	$ 40.60
Shares relating to the conversion premium	20,022	20,022

Commitments Contingencies and Litigation - Additional Information (Detail) € in Thousands, $ in Thousands, lb in Millions	12 Months Ended
	Mar. 31, 2013 USD ($) Person lb	Mar. 31, 2012 USD ($) lb	Oct. 02, 2011 USD ($)	Oct. 02, 2011 EUR (€)	Mar. 31, 2009 USD ($)	Mar. 31, 2009 EUR (€)
Commitments, Contingencies And Litigation [Line Items]
Litigation damages assessed and paid					$ 4,200	€ 2,700
Refund from damages paid			$ 900	€ 671
Reserves of environmental liabilities	$ 2,915	$ 2,995
Company number of employees \| Person	9,000
Percentage of employees covered by collective bargaining agreements	35.00%
Average term of collective bargaining agreements	2 years
Longest term of collective bargaining agreements	4 years
Percentage of collective bargaining agreements that expire in next twelve months	33.00%
Lead hedge forward contracts
Commitments, Contingencies And Litigation [Line Items]
Purchase price of hedges, pounds of lead \| lb	56.3	60.0
Purchase price of hedges	$ 56,601	$ 56,610
Foreign currency forward contracts
Commitments, Contingencies And Litigation [Line Items]
Purchase price of hedges	73,115	53,531
Interest rate swap agreements
Commitments, Contingencies And Litigation [Line Items]
Convertible interest rate swap	$ 65,000	$ 85,000
Interest rate swap agreements expiration date	May 01, 2013

Restructuring Plans - Additional Information (Detail) $ in Thousands	3 Months Ended									12 Months Ended			36 Months Ended
	Mar. 31, 2013 USD ($)	Dec. 30, 2012 USD ($)	Sep. 30, 2012 USD ($)	Jul. 01, 2012 USD ($)	Mar. 31, 2012 USD ($)	Jan. 01, 2012 USD ($)	Oct. 02, 2011 USD ($)	Jul. 03, 2011 USD ($)	Jan. 02, 2011 Person Facility	Mar. 31, 2013 USD ($) Position	Mar. 31, 2012 USD ($) Person Employee	Mar. 31, 2011 USD ($) Employee	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)
Restructuring Cost and Reserve [Line Items]
Reduction in number of employees \| Person											470
Restructuring charges incurred to date														$ 31,753
Restructuring charges	$ 1,723	$ 3,776	$ 1,295	$ 370	$ 2,236	$ 1,440	$ 902	$ 410		$ 7,164	$ 4,988	$ 6,813
Restructuring charges, non - cash charges related to the write - off of fixed assets and inventory										2,290
Restructuring Twenty Twenty Actions [Member] \| Restructurings Related To Improving Efficiency of Manufacturing Operations in EMEA
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees \| Employee											85
Charges related to restructuring plan										913	$ 2,433
Severance - related costs											3,600
Restructuring charges										475	3,070
Restructuring reserve	185									$ 185
Restructuring Twenty Thirteen Actions \| Restructurings Related To Improving Efficiency of Manufacturing Operations in EMEA
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees \| Position										130
Charges related to restructuring plan										$ 952
Severance - related costs										8,100
Restructuring charges										3,998
Restructuring reserve	1,594									1,594
Restructuring charges, non - cash charges related to the write - off of fixed assets and inventory										1,399
Restructuring charges, cash charges related to employee severance and other charges										2,599
Expected additional restructuring charges										3,000
Restructuring Twenty Thirteen Actions \| Restructurings Related To Closure of Manufacturing Facility in China
Restructuring Cost and Reserve [Line Items]
Charges related to restructuring plan										221
Severance - related costs										3,400
Restructuring charges										2,691
Restructuring reserve	$ 180									180
Restructuring charges, cash charges related to employee severance and other charges										401
Expected additional restructuring charges										700
Oerlikon
Restructuring Cost and Reserve [Line Items]
Number of manufacturing facilities closed \| Facility									2
Reduction in number of employees \| Person									100
Restructuring charges incurred to date													$ 4,526
European Operations
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees \| Employee												60
Europe
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date												$ 5,178
Charges related to restructuring plan										$ 556	$ 4,579	$ 4,579

Reconciliation of Restructuring Reserve (Detail) - Acquisition Related Restructuring Reserve - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 403	$ 1,292
Accrued	711	2,546
Costs incurred	(1,114)	(3,420)
Foreign currency impact and other		(15)
Balance at March 31, 2012		403
Employee Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	257	1,292
Accrued	81	108
Costs incurred	(338)	(1,107)
Foreign currency impact and other		(36)
Balance at March 31, 2012		257
Plant Closure and Other
Restructuring Cost and Reserve [Line Items]
Beginning Balance	146
Accrued	630	2,438
Costs incurred	$ (776)	(2,313)
Foreign currency impact and other		21
Balance at March 31, 2012		$ 146

Acquisition and Non-Acquisition Related Restructuring Reserve (Detail) - Non-Acquisition Related Restructuring Plans - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 1,186	$ 4,920	$ 7,482
Accrual adjustment		(681)
Accrued	3,475	4,958	4,267
Costs incurred	(2,642)	(7,966)	(6,945)
Foreign currency impact and other	(60)	(45)	116
Balance at March 31, 2012	1,959	1,186	4,920
Employee Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,186	4,920	7,482
Accrual adjustment		(681)
Accrued	3,093	4,958	4,267
Costs incurred	(2,485)	(7,966)	(6,945)
Foreign currency impact and other	(56)	(45)	116
Balance at March 31, 2012	1,738	$ 1,186	$ 4,920
Plant Closure and Other
Restructuring Cost and Reserve [Line Items]
Accrued	382
Costs incurred	(157)
Foreign currency impact and other	(4)
Balance at March 31, 2012	$ 221

Analysis of Changes in Liability for Product Warranties (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Warranty Liability [Line Items]
Balance at beginning of period	$ 42,067	$ 36,006	$ 31,739
Current year provisions	19,724	26,841	20,565
Costs incurred	(20,945)	(20,185)	(17,499)
Foreign exchange and other	1,745	(595)	1,201
Balance at end of period	$ 42,591	$ 42,067	$ 36,006

Summary of Other Income Expense Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Components of Other Income (Expense) [Line Items]
Foreign exchange transaction losses	$ 1,887	$ 1,483	$ 732
Insurance recoveries	(1,800)
Secondary offering fees			615
Other	829	1,585	830
Total	$ 916	$ 3,068	$ 2,177

Charges Related to Refinancing (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Components of Other Income (Expense) [Line Items]
Charges related to refinancing	$ 8,155	$ 8,155

Other Income Expense Net and Charges Related to Refinancing - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2011	Mar. 31, 2010
Components of Other Income (Expense) [Line Items]
Charges related to refinancing	$ 8,155	$ 8,155
Write-offs of deferred financing fees	2,308
Interest rate swap agreements, losses from discontinued hedging accounting	$ 5,847

Schedule of Financial Data for Company Reportable Business Segments and Product Lines (Detail) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 30, 2012

Sep. 30, 2012

Jul. 01, 2012

Mar. 31, 2012

Jan. 01, 2012

Oct. 02, 2011

Jul. 03, 2011

Mar. 31, 2013

Mar. 31, 2012

Mar. 31, 2011

$ 572,117

$ 557,320

$ 554,212

$ 593,910

$ 592,754

$ 574,246

$ 547,140

$ 569,229

$ 2,277,559

$ 2,283,369

$ 1,964,462

Net sales revenue by services

^[1]

145,047

134,949

119,076

2,277,559

2,283,369

1,964,462

56,991

^[2]

59,737

^[2]

62,885

^[2]

70,255

^[2]

65,879

^[3]

53,777

^[3]

42,440

^[3]

48,715

^[3]

249,868

^[2],[4]

210,811

^[3],[4]

183,814

^[4]

(1,723)

$ (3,776)

$ (1,295)

$ (370)

(2,236)

$ (1,440)

$ (902)

$ (410)

(7,164)

(4,988)

(6,813)

350,126

353,215

350,126

353,215

344,385

55,286

48,943

59,940

50,502

50,360

44,393

Reserve Power

Net sales revenue by services

1,118,965

1,092,734

970,480

Motive Power

Net sales revenue by services

1,158,594

1,190,635

993,982

Europe

926,165

995,431

890,313

76,947

75,652

55,586

64,032

63,872

55,643

(4,473)

(4,988)

(6,813)

152,577

161,854

152,577

161,854

169,056

20,761

21,631

22,034

Europe | Legal Settlement

22,255

25,451

21,564

Bargain purchase gain

900

Americas

1,126,904

1,082,747

896,629

36,854

38,115

42,141

171,854

138,894

124,515

152,678

144,701

152,678

144,701

142,263

29,566

20,862

22,368

23,073

21,466

19,842

Asia

224,490

205,191

177,520

31,246

21,182

21,349

21,146

12,133

10,469

(2,691)

$ 44,871

$ 46,660

44,871

46,660

33,066

4,959

6,450

15,538

Quarterly Financial Information [Line Items]

$ 5,174

$ 3,443

$ 2,987

[1]	Intersegment sales are presented on a cost-plus basis which takes into consideration the effect of transfer prices between legal entities.
[2]	Included in Operating earnings were restructuring charges of $370, $1,295, $3,776 and $1,723 for the first, second, third and fourth quarters of fiscal 2013, respectively.
[3]	Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.
[4]	The Company does not allocate interest expense or other (income) expense to the reportable segments.

Operations by Industry Segment and Geographic Area - Additional Information (Detail) $ in Thousands	Mar. 31, 2013 USD ($) Country	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)
Segment Reporting Information [Line Items]
Operations in number of countries \| Country	100
Property, plant, and equipment, net	$ 350,126	$ 353,215	$ 344,385
United States
Segment Reporting Information [Line Items]
Percentage of sales to customers	43.00%	42.60%	41.30%
Property, plant, and equipment, net	$ 127,191	$ 119,242

Summary of Interim Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Mar. 31, 2013

Dec. 30, 2012

Sep. 30, 2012

Jul. 01, 2012

Mar. 31, 2012

Jan. 01, 2012

Oct. 02, 2011

Jul. 03, 2011

Mar. 31, 2013

Mar. 31, 2012

Mar. 31, 2011

Net sales

$ 572,117

$ 557,320

$ 554,212

$ 593,910

$ 592,754

$ 574,246

$ 547,140

$ 569,229

$ 2,277,559

$ 2,283,369

$ 1,964,462

Gross profit

139,013

143,698

138,339

148,306

145,463

130,876

114,395

121,971

569,356

512,705

449,844

Operating earnings

56,991

^[1]

59,737

^[1]

62,885

^[1]

70,255

^[1]

65,879

^[2]

53,777

^[2]

42,440

^[2]

48,715

^[2]

249,868

^[1],[3]

210,811

^[2],[3]

183,814

^[3]

Net earnings

37,706

38,677

43,011

45,564

45,323

36,859

28,289

33,496

164,958

143,967

113,426

Net earnings attributable to EnerSys stockholders

$ 37,730

$ 39,184

$ 43,790

$ 45,804

$ 45,359

$ 36,859

$ 28,289

$ 33,496

$ 166,508

$ 144,003

$ 113,426

Net earnings per common share attributable to EnerSys stockholders-basic

$ 0.79

$ 0.81

$ 0.91

$ 0.96

$ 0.95

$ 0.77

$ 0.57

$ 0.67

$ 3.47

$ 2.95

$ 2.30

Net earnings per common share attributable to EnerSys stockholders-diluted

$ 0.77

$ 0.80

$ 0.90

$ 0.95

$ 0.94

$ 0.77

$ 0.57

$ 0.66

$ 3.42

$ 2.93

$ 2.27

[1]	Included in Operating earnings were restructuring charges of $370, $1,295, $3,776 and $1,723 for the first, second, third and fourth quarters of fiscal 2013, respectively.
[2]	Included in Operating earnings were restructuring charges of $410, $902, $1,440 and $2,236 for the first, second, third and fourth quarters of fiscal 2012, respectively. Operating earnings also included a legal proceedings settlement income of $900, in the second quarter of fiscal 2012.
[3]	The Company does not allocate interest expense or other (income) expense to the reportable segments.

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.