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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

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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Jul. 01, 2012	Aug. 03, 2012
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 01, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Trading Symbol	ENS
Entity Registrant Name	ENERSYS
Entity Central Index Key	0001289308
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		48,020,321

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Jul. 01, 2012	Mar. 31, 2012
Current assets:
Cash and cash equivalents	$ 180,711	$ 160,490
Accounts receivable, net of allowance for doubtful accounts (July 1, 2012 - $9,297; March 31, 2012 - $10,022)	478,483	466,769
Inventories, net	350,046	361,774
Deferred taxes	32,539	30,247
Prepaid and other current assets	46,367	52,393
Total current assets	1,088,146	1,071,673
Property, plant, and equipment, net	346,643	353,215
Goodwill	344,771	352,737
Other intangible assets, net	105,714	107,082
Other assets	38,819	40,248
Total assets	1,924,093	1,924,955
Current liabilities:
Short-term debt	11,099	16,042
Current portion of long-term debt and capital lease obligations	2,789	2,949
Accounts payable	231,049	249,996
Accrued expenses	181,862	191,314
Total current liabilities	426,799	460,301
Long-term debt and capital lease obligations	258,637	237,110
Deferred taxes	82,887	84,479
Other liabilities	92,185	92,468
Total liabilities	860,508	874,358
Commitments and contingencies
Redeemable noncontrolling interests	9,142	9,782
Equity:
Common Stock, $0.01 par value per share, 135,000,000 shares authorized; 52,464,406 shares issued and 48,017,521 outstanding at July 1, 2012; 52,247,014 shares issued and 47,800,129 shares outstanding at March 31, 2012	524	522
Additional paid-in capital	479,583	474,924
Treasury stock, at cost, 4,446,885 shares held as of July 1, 2012 and March 31, 2012	(78,183)	(78,183)
Retained earnings	606,643	560,839
Accumulated other comprehensive income	37,511	74,093
Total EnerSys stockholders' equity	1,046,078	1,032,195
Noncontrolling interests	8,365	8,620
Total equity	1,054,443	1,040,815
Total liabilities and equity	$ 1,924,093	$ 1,924,955

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 01, 2012	Mar. 31, 2012
Accounts receivable, allowance for doubtful accounts	$ 9,297	$ 10,022
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	135,000,000	135,000,000
Common Stock, shares issued	52,464,406	52,247,014
Common Stock, shares outstanding	48,017,521	47,800,129
Treasury stock, shares	4,446,885	4,446,885

Consolidated Condensed Statements of Income - USD ($)
$ in Thousands

3 Months Ended

Jul. 01, 2012

Jul. 03, 2011

Net sales

$ 593,910

$ 569,229

Cost of goods sold

445,604

447,258

Gross profit

148,306

121,971

Operating expenses

77,681

72,846

Restructuring charges

370

410

Operating earnings

^[1]

70,255

48,715

Interest expense

4,732

3,414

Other (income) expense, net

1,250

1,227

Earnings before income taxes

64,273

44,074

Income tax expense

18,709

10,578

Net earnings

45,564

33,496

Net losses attributable to noncontrolling interests

(240)

Net earnings attributable to EnerSys stockholders

$ 45,804

$ 33,496

Net earnings per common share attributable to EnerSys stockholders:

Basic

$ 0.96

$ 0.67

Diluted

$ 0.95

$ 0.66

Weighted-average shares of common stock outstanding:

Basic

47,901,203

50,052,627

Diluted

48,426,991

50,668,276

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

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Net earnings	$ 45,564	$ 33,496
Other comprehensive income:
Net unrealized gain (loss) on derivative instruments, net of tax	(5,346)	2,746
Pension funded status adjustment, net of tax	215	(27)
Foreign currency translation adjustments	(31,975)	14,977
Total comprehensive income	8,458	51,192
Comprehensive loss attributable to noncontrolling interests	(764)
Comprehensive income attributable to EnerSys stockholders	$ 9,222	$ 51,192

- Definition

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.

+ References + Details

- Definition

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.

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- Definition

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.

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- Definition

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).

+ References

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+ Details

- Definition

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

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+ Details

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Cash flows from operating activities
Net earnings	$ 45,564	$ 33,496
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	12,450	12,122
Derivatives not designated in hedging relationships:
Net losses	129
Cash settlements	(730)
Provision for doubtful accounts	(131)	598
Deferred income taxes	(707)	46
Non-cash interest expense	2,139	1,878
Stock-based compensation	3,373	2,718
(Gain) loss on disposal of property, plant, and equipment	(108)	52
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(22,841)	983
Inventory	(190)	(15,748)
Prepaid expenses and other current assets	3,141	(2,667)
Other assets	(1,394)	1,201
Accounts payable	(12,471)	(11,021)
Accrued expenses	(8,619)	(6,701)
Other liabilities	4,610	45
Net cash provided by operating activities	24,215	17,002
Cash flows from investing activities
Capital expenditures	(16,060)	(11,674)
Proceeds from disposal of property, plant, and equipment	14	44
Net cash used in investing activities	(16,046)	(11,630)
Cash flows from financing activities
Net (decrease) increase in short-term debt	(4,095)	9,382
Proceeds from revolving credit borrowings	122,650
Repayment of revolving credit borrowings	(107,150)
Proceeds from long-term debt - other	5,959
Capital lease obligations and other	(195)	(1,103)
Net effect from exercising of stock options and vesting of equity awards	(870)	(763)
Excess tax benefits from exercises of stock options and vesting of equity awards	2,159	2,921
Purchase of treasury stock		(9,753)
Net cash provided by financing activities	18,458	684
Effect of exchange rate changes on cash and cash equivalents	(6,406)	1,652
Net increase in cash and cash equivalents	20,221	7,708
Cash and cash equivalents at beginning of period	160,490	108,869
Cash and cash equivalents at end of period	$ 180,711	$ 116,577

Basis of Presentation

3 Months Ended

Jul. 01, 2012

Basis of Presentation

1. Basis of Presentation

The accompanying interim unaudited consolidated condensed financial statements of EnerSys (the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and notes required for complete financial statements. In the opinion of management, the unaudited consolidated condensed financial statements include all normal recurring adjustments considered necessary for the fair presentation of the financial position, results of operations, and cash flows for the interim periods presented. The financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s 2012 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on May 25, 2012.

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 end 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.

The consolidated condensed 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. All intercompany transactions and balances have been eliminated in consolidation.

The Company also consolidates certain subsidiaries in which the noncontrolling interest party has within their 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. Redeemable noncontrolling interests which are redeemable only upon future events, the occurrence of which is not currently probable, are recorded at carrying value.

Certain amounts in the prior year’s financial statements have been reclassified to conform to the current-year presentation.

Recently Adopted Accounting Pronouncements

In the first quarter of fiscal 2013, the Company conformed its presentation of results of operations, in accordance with new guidance on the presentation of comprehensive income (loss). The guidance requires total comprehensive income (loss) for interim periods to be presented in single continuous statement or in two separate, but consecutive, statements. The new guidance does not change where the components of comprehensive income (loss) are recognized.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

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+ Details

Inventories

3 Months Ended

Jul. 01, 2012

Inventories

2. Inventories

Inventories, net consist of:


	July 1, 2012		March 31, 2012

Raw materials	$	93,669	$	100,538
Work-in-process		111,348		111,629
Finished goods		145,029		149,607

Total	$	350,046	$	361,774

Inventory reserves for obsolescence and other estimated losses were $15,983 and $14,831 at July 1, 2012 and March 31, 2012, respectively, and have been included in the net amounts shown above.

Fair Value of Financial Instruments

3 Months Ended

Jul. 01, 2012

Fair Value of Financial Instruments

3. 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 July 1, 2012 and March 31, 2012 and the basis for that measurement:


	Total Fair Value Measurement July 1, 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	$	(3,076	)	$	—	$	(3,076	)	$	—
Lead forward contracts		(4,308	)		—		(4,308	)		—
Foreign currency forward contracts		202			—		202			—

Total derivatives	$	(7,182	)	$	—	$	(7,182	)	$	—


	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 value 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 value 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 value 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 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 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 current terms are comparable to market terms as of the balance sheet dates and are classified as Level 2.

The Company’s $172,500 senior unsecured 3.375% convertible notes (“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 July 1, 2012, the Company’s stock price closed at $35.07 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 112% of face value on July 1, 2012, 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 July 1, 2012 and March 31, 2012 were as follows:


	July 1, 2012						March 31, 2012
	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Financial assets:
Derivatives ⁽¹⁾	$	202		$	202		$	782		$	782

Financial liabilities:
Convertible Notes	$	149,968	⁽²⁾	$	193,200	⁽³⁾	$	148,272	⁽²⁾	$	200,100	⁽³⁾
Derivatives ⁽¹⁾		7,384			7,384			4,723			4,723

⁽¹⁾	Represents interest rate swap agreements, lead and foreign currency hedges (see Note 4 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at July 1, 2012 and March 31, 2012).

⁽²⁾	The carrying amounts of the Convertible Notes at July 1, 2012 and March 31, 2012 represent the $172,500 principal value, less the unamortized debt discount (see Note 9).

⁽³⁾	The fair value amounts of the Convertible Notes at July 1, 2012 and March 31, 2012 represent the trading values of the Convertible Notes with a principal value of $172,500.

- Definition

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.

+ References

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
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
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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
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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.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Number 107
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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.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
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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.

+ Details

Derivative Financial Instruments

3 Months Ended

Jul. 01, 2012

Derivative Financial Instruments

4. 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 based on the criteria under FASB guidance. The vast majority of such contracts are for a period not extending beyond one year and the notional amounts at July 1, 2012 and March 31, 2012 were 60.5 million 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 and other commodity purchases 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 July 1, 2012 and March 31, 2012, the Company had entered into a total of $53,318 and $42,121, respectively, of such contracts.

In the coming twelve months, the Company anticipates that $6,495 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 July 1, 2012 and March 31, 2012, the Company maintained interest rate swap agreements that converted $85,000 of variable-rate debt to a fixed-rate basis, utilizing the three-month LIBOR, as a floating rate reference. These agreements expire between February 2013 and May 2013. Changes in the fair value of these agreements of $15 and $710 in expense during the first quarter of fiscal 2013 and 2012, respectively, have been recorded in the consolidated condensed statements of income in other (income) expense, net.

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. These are not designated as hedging instruments. As of July 1, 2012 and March 31, 2012, the notional amount of these contracts was $30,582 and $11,410, respectively. Net changes in the fair value of these contracts of $114 in expense during the first quarter of fiscal 2013 have been recorded in the consolidated condensed statements of income in other (income) expense, net.

Presented below in tabular form is information on the location and amounts of derivative fair values in the consolidated condensed balance sheets and derivative gains and losses in the consolidated condensed statements of income:

Fair Value of Derivative Instruments

July 1, 2012 and March 31, 2012


	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging Instruments
	July 1,		March 31,		July 1,		March 31,
	2012		2012		2012		2012
Prepaid and other current assets
Foreign currency forward contracts	$	284	$	670	$	—	$	112
Other assets
Lead hedge forward contracts		—		30		—		—

Total assets	$	284	$	700	$	—	$	112


Accrued expenses
Interest rate swap agreements	$	—	$	—	$	3,076	$	3,628
Lead hedge forward contracts		4,137		881		—		—
Foreign currency forward contracts		—		—		82		—
Other liabilities
Lead hedge forward contracts		171		—		—		—
Interest rate swap agreements		—		—		—		244

Total liabilities	$	4,308	$	881	$	3,158	$	3,872

The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income

For the quarter ended July 1, 2012


Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)

Lead hedge contracts	$	(6,413	)	Cost of goods sold	$	1,498
Foreign currency forward contracts		707		Cost of goods sold		1,278

Total	$	(5,706	)		$	2,776


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	$	(15	)
Foreign currency forward contracts	Other (income) expense, net		(114	)

Total		$	(129	)

The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income

For the quarter ended July 3, 2011


Derivatives in a Cash Flow Hedging Relationship	Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)

Lead hedge contracts	$	(1,422	)	Cost of goods sold	$	(895	)
Foreign currency forward contracts		156		Cost of goods sold		(1,935	)

Total	$	(1,266	)		$	(2,830	)

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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-Number 133
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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.

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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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.

+ Details

Income Taxes

3 Months Ended

Jul. 01, 2012

Income Taxes

5. Income Taxes

The Company’s income tax provisions for all periods consist of federal, state and foreign income taxes. The tax provisions for the first quarters of fiscal 2013 and 2012 were based on the estimated effective tax rates applicable for the full years ending March 31, 2013 and March 31, 2012, respectively, after giving effect to items specifically related to the interim periods.

The effective income tax rates for the first quarters of fiscal 2013 and 2012 were 29.1% and 24.0%, respectively. The rate increase in the first quarter of fiscal 2013 as compared to the prior year quarter is primarily due to changes in the mix of earnings among tax jurisdictions, the expiration of certain U.S. corporate tax exemptions and the decrease in favorable discrete items compared to prior year quarter.

- Definition

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.

+ References

+ Details

Warranties

3 Months Ended

Jul. 01, 2012

Warranties

6. Warranties

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


	Quarter ended
	July 1, 2012			July 3, 2011

Balance at beginning of period	$	42,067		$	36,006
Current period provisions		5,596			6,185
Costs incurred		(4,495	)		(4,441	)
Foreign exchange and other		(680	)		435

Balance at end of period	$	42,488		$	38,185

Commitments, Contingencies and Litigation

3 Months Ended

Jul. 01, 2012

Commitments, Contingencies and Litigation

7. 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. See Note 19 to the Consolidated Financial Statements included in the Company’s 2012 Annual Report on Form 10-K. There have been no significant changes since March 31, 2012.

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 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. See Note 19 to the Consolidated Financial Statements included in the Company’s 2012 Annual Report on Form 10-K for a full description of environmental issues. There have been no significant changes since March 31, 2012.

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 July 1, 2012 and March 31, 2012, the Company has hedged the price to purchase 60.5 million and 60.0 million pounds of lead, respectively, for a total purchase price of $55,397 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 maturity period for substantially all these contracts is less than 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 $83,900 and $53,531, respectively, of foreign currency forward contracts with financial institutions as of July 1, 2012 and March 31, 2012.

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 July 1, 2012 and March 31, 2012, such agreements which expire between February 2013 and May 2013, converted $85,000 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.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

+ Details

Restructuring Plans

3 Months Ended

Jul. 01, 2012

Restructuring Plans

8. Restructuring Plans

During fiscal 2011, the Company announced a restructuring of its European operations, which will result in the reduction of approximately 60 employees upon completion across its operations. The Company estimates that the total charges for these actions will amount to approximately $5,200, primarily from cash expenses for employee severance-related payments and site closure costs. Based on commitments incurred to date, the Company recorded restructuring charges of $5,178 in fiscal 2011 through 2012, with no additional charges in the first quarter of fiscal 2013. The Company incurred $4,579 of costs against the accrual during fiscal 2011 through 2012, with an additional $121 of costs incurred during the first quarter of fiscal 2013. As of July 1, 2012, the reserve balance associated with these actions is $408. The Company does not expect to be committed to significant additional restructuring charges in fiscal 2013 related to these actions.

During fiscal 2012, the Company announced restructuring plans related to its operations in Europe, 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 80 employees upon completion. The Company estimates that the total charges for these actions will amount to approximately $4,200, primarily from cash expenses for employee severance-related payments. The Company recorded restructuring charges of $3,070 in fiscal 2012 with an additional $370 of costs incurred during the first quarter of fiscal 2013. The Company incurred $2,433 of costs against the accrual during fiscal 2012, with an additional $389 of costs incurred during the first quarter of fiscal 2013. As of July 1, 2012, the reserve balance associated with these actions is $603. The Company expects to be committed to an additional $760 of restructuring charges in fiscal 2013 related to these actions.

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


	Employee Severance
Balance at March 31, 2012	$	1,186

Accrued		370
Costs incurred		(510	)
Foreign currency impact and other		(35	)


Balance at July 1, 2012	$	1,011

- Definition

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.

+ References + Details

Debt

3 Months Ended

Jul. 01, 2012

Debt

9. Debt

The following summarizes the Company’s long-term debt including capital lease obligations:


	July 1, 2012		March 31, 2012
3.375% Convertible Notes, net of discount, due 2038	$	149,968	$	148,272
2011 Credit Facility due 2016		94,900		79,400
China Term Loan due 2017		11,172		6,034
India Term Loan due 2017		4,642		5,383
Capital lease obligations and other		744		970


		261,426		240,059
Less current portion		2,789		2,949


Total long-term debt and capital lease obligations	$	258,637	$	237,110

The Convertible Notes are represented by a liability component which is reported herein as long-term debt, net of discount and an equity component representing the convertible feature, which is included in additional paid-in-capital in EnerSys stockholders’ equity.

The following represents the principal amount of the liability component, the unamortized discount, and the net carrying amount of our Convertible Notes as of July 1, 2012 and March 31, 2012, respectively:


	July 1, 2012			March 31, 2012

Principal	$	172,500		$	172,500
Unamortized discount		(22,532	)		(24,228	)

Net carrying amount	$	149,968		$	148,272

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

As of July 1, 2012, the remaining discount will be amortized over a period of 35 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 $1,696 and $1,558, respectively, during the quarters ended July 1, 2012 and July 3, 2011.

Available Lines of Credit

As of July 1, 2012 and March 31, 2012, the Company had available and undrawn, under all its lines of credit, $357,554 and $377,230, respectively. Included in the July 1, 2012 and March 31, 2012 amounts are $97,375 and $95,340, respectively, of uncommitted lines of credit.

As of July 1, 2012 and March 31, 2012, the Company had $9,100 and $9,108, respectively, of standby letters of credit. As of July 1, 2012 and March 31, 2012, the Company had no bank guarantees.

- Definition

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.

+ References + Details

Retirement Plans

3 Months Ended

Jul. 01, 2012

Retirement Plans

10. Retirement Plans

The following tables present the components of the Company’s net periodic benefit cost related to its defined benefit pension plans:


	United States Plans						International Plans
	Quarter Ended						Quarter Ended
	July 1, 2012			July 3, 2011			July 1, 2012			July 3, 2011

Service cost	$	81		$	70		$	177		$	181
Interest cost		164			166			594			653
Expected return on plan assets		(189	)		(176	)		(464	)		(458	)
Amortization and deferral		100			58			52			7

Net periodic benefit cost	$	156		$	118		$	359		$	383

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

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
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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.

Reference 11: http://www.xbrl.org/2003/role/presentationRef
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-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
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-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.

+ Details

Stock-Based Compensation

3 Months Ended

Jul. 01, 2012

Stock-Based Compensation

11. Stock-Based Compensation

As of July 1, 2012, 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 types of equity awards including nonqualified stock options, restricted stock, restricted stock units, market share units and other forms of equity-based compensation.

The Company recognized equity-based compensation expense associated with its equity incentive plans of $3,373, with a related tax benefit of $978, for the first quarter of fiscal 2013, and $2,718 with a related tax benefit of $653, for the first quarter of fiscal 2012.

In the first quarter of fiscal 2013, the Company granted to management and other key employees 202,452 restricted stock units which vest 25% each year over four years from the date of grant, and 292,125 market share units which vest three years from the date of grant. In the first quarter of fiscal 2012, the Company granted to management and other key employees 96,840 restricted stock units and 224,397 market share units with similar vesting as in fiscal 2013 grants.

Common stock activity for the first quarter of fiscal 2013 included the exercise of 49,980 options and the vesting of 226,593 restricted stock units and for the comparable period in fiscal 2012 included the exercise of 79,800 options and the vesting of 243,676 restricted stock units. Net cash paid, reflecting the cost of equity awards surrendered for option price and withholding taxes were $870 and $763, respectively, for the first quarter of fiscal 2013 and 2012.

As of July 1, 2012 there were 581,183 non-qualified stock options, 592,349 restricted stock units and 638,688 market share units outstanding. At March 31, 2012, there were 633,663 non-qualified stock options, 617,240 restricted stock units and 346,563 market share units outstanding.

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section 50
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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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
-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.

+ Details

Stockholders' Equity

3 Months Ended

Jul. 01, 2012

Stockholders' Equity

12. Stockholders’ Equity

Common Stock

The following demonstrates the change in the number of shares of Common Stock outstanding during the first quarter ended July 1, 2012:


Shares outstanding as of March 31, 2012			47,800,129
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes			217,392

Shares outstanding as of July 1, 2012			48,017,521

Treasury Stock

There were no stock repurchases during the first quarter of fiscal 2013. During the first quarter of fiscal 2012, the Company purchased 294,200 shares of its common stock for $9,753 from institutional shareholders. At July 1, 2012 and March 31, 2012, the Company held 4,446,885 shares as treasury stock.

Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income are as follows:


	March 31, 2012			Before-Tax Amount			Tax Benefit (Expense)		Net-of-Tax Amount			July 1, 2012

Pension funded status adjustment	$	(8,982	)	$	215		$	—	$	215		$	(8,767	)
Unrealized gain (loss) on derivative instruments		1,175			(8,482	)		3,136		(5,346	)		(4,171	)
Foreign currency translation adjustment		81,900			(31,451	)		—		(31,451	)		50,449


Accumulated other comprehensive income	$	74,093		$	(39,718	)	$	3,136	$	(36,582	)	$	37,511

- Definition

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.

+ References

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
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
-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 11: 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=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
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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.

Reference 15: http://www.xbrl.org/2003/role/presentationRef
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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.

Reference 16: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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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.

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
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Reference 18: http://www.xbrl.org/2003/role/presentationRef
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-Number 210
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Reference 19: http://www.xbrl.org/2003/role/presentationRef
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-Name Staff Accounting Bulletin (SAB)
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Reference 20: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 08
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Reference 21: http://www.xbrl.org/2003/role/presentationRef
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Reference 22: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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Reference 23: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Earnings Per Share

3 Months Ended

Jul. 01, 2012

Earnings Per Share

13. Earnings Per Share

The following table sets forth the reconciliation from basic to diluted average common shares and the calculations of net earnings per common share:


	Quarter ended
	July 1, 2012		July 3, 2011

Net earnings attributable to EnerSys stockholders	$	45,804	$	33,496

Average common shares:
Basic (weighted average outstanding shares)		47,901,203		50,052,627
Dilutive potential common shares from exercise and lapse of equity awards, net of shares assumed reacquired		525,788		615,649


Diluted (weighted average outstanding shares)		48,426,991		50,668,276


Basic earnings per common share attributable to EnerSys stockholders	$	0.96	$	0.67

Diluted earnings per common share attributable to EnerSys stockholders	$	0.95	$	0.66

Anti-dilutive equity awards not included in weighted average common shares – diluted		107,217		317,435

The aggregate number of common shares that the Company could be obligated to issue upon conversion of its Convertible Notes that the Company sold in May 2008 is 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 the Company’s common stock or a combination of cash and shares. No contingent shares were included in diluted shares outstanding during the first quarters of fiscal 2013 and 2012, 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.

Business Segments

3 Months Ended

Jul. 01, 2012

Business Segments

14. Business Segments

The Company has three reportable business segments based on geographic regions, defined as follows:

•

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

•

Europe, 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.

The following table provides selected financial data for the Company’s reportable business segments and product lines:


	Quarter ended
	July 1, 2012			July 3, 2011
Net sales by segment to unaffiliated customers
Europe	$	237,051		$	252,992
Americas		288,924			259,228
Asia		67,935			57,009


Total net sales	$	593,910		$	569,229


Net sales by product line
Reserve power	$	289,294		$	265,936
Motive power		304,616			303,293


Total net sales	$	593,910		$	569,229


Intersegment sales
Europe	$	22,162		$	16,132
Americas		10,554			10,146
Asia		6,359			3,054


Total intersegment sales ⁽¹⁾	$	39,075		$	29,332


Operating earnings by segment
Europe	$	17,220		$	14,137
Americas		44,514			31,618
Asia		8,891			3,370
Restructuring charges (Europe)		(370	)		(410	)


Total operating earnings ⁽²⁾	$	70,255		$	48,715

(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.

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
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+ Details

Subsequent Events	3 Months Ended
Subsequent Events	Jul. 01, 2012
Subsequent Events	15. Subsequent Events The Company evaluated all subsequent events through the date that the Consolidated Condensed Financial Statements were issued. No material subsequent events have occurred since July 1, 2012 that required recognition or disclosure in the Consolidated Condensed Financial Statements.

Inventories (Tables)

3 Months Ended

Jul. 01, 2012

Summary Of Inventories

Inventories, net consist of:


	July 1, 2012		March 31, 2012

Raw materials	$	93,669	$	100,538
Work-in-process		111,348		111,629
Finished goods		145,029		149,607

Total	$	350,046	$	361,774

Fair Value of Financial Instruments (Tables)

3 Months Ended

Jul. 01, 2012

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 July 1, 2012 and March 31, 2012 and the basis for that measurement:


	Total Fair Value Measurement July 1, 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	$	(3,076	)	$	—	$	(3,076	)	$	—
Lead forward contracts		(4,308	)		—		(4,308	)		—
Foreign currency forward contracts		202			—		202			—

Total derivatives	$	(7,182	)	$	—	$	(7,182	)	$	—


	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 July 1, 2012 and March 31, 2012 were as follows:


	July 1, 2012						March 31, 2012
	Carrying Amount			Fair Value			Carrying Amount			Fair Value
Financial assets:
Derivatives ⁽¹⁾	$	202		$	202		$	782		$	782

Financial liabilities:
Convertible Notes	$	149,968	⁽²⁾	$	193,200	⁽³⁾	$	148,272	⁽²⁾	$	200,100	⁽³⁾
Derivatives ⁽¹⁾		7,384			7,384			4,723			4,723

⁽¹⁾	Represents interest rate swap agreements, lead and foreign currency hedges (see Note 4 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at July 1, 2012 and March 31, 2012).

⁽²⁾	The carrying amounts of the Convertible Notes at July 1, 2012 and March 31, 2012 represent the $172,500 principal value, less the unamortized debt discount (see Note 9).

⁽³⁾	The fair value amounts of the Convertible Notes at July 1, 2012 and March 31, 2012 represent the trading values of the Convertible Notes with a principal value of $172,500.

- Definition

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.

+ References

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+ Details

- Definition

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.

+ References

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+ Details

Derivative Financial Instruments (Tables)

3 Months Ended

Jul. 01, 2012

Fair Value of Derivative Instruments

Fair Value of Derivative Instruments

July 1, 2012 and March 31, 2012


	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging Instruments
	July 1,		March 31,		July 1,		March 31,
	2012		2012		2012		2012
Prepaid and other current assets
Foreign currency forward contracts	$	284	$	670	$	—	$	112
Other assets
Lead hedge forward contracts		—		30		—		—

Total assets	$	284	$	700	$	—	$	112


Accrued expenses
Interest rate swap agreements	$	—	$	—	$	3,076	$	3,628
Lead hedge forward contracts		4,137		881		—		—
Foreign currency forward contracts		—		—		82		—
Other liabilities
Lead hedge forward contracts		171		—		—		—
Interest rate swap agreements		—		—		—		244

Total liabilities	$	4,308	$	881	$	3,158	$	3,872

The Effect Of Derivative Instruments On Consolidated Condensed Statements Of Income

The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income

For the quarter ended July 1, 2012


Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)

Lead hedge contracts	$	(6,413	)	Cost of goods sold	$	1,498
Foreign currency forward contracts		707		Cost of goods sold		1,278

Total	$	(5,706	)		$	2,776


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	$	(15	)
Foreign currency forward contracts	Other (income) expense, net		(114	)

Total		$	(129	)

The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income

For the quarter ended July 3, 2011


Derivatives in a Cash Flow Hedging Relationship	Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)

Lead hedge contracts	$	(1,422	)	Cost of goods sold	$	(895	)
Foreign currency forward contracts		156		Cost of goods sold		(1,935	)

Total	$	(1,266	)		$	(2,830	)

- Definition

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.

+ References

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+ Details

Warranties (Tables)

3 Months Ended

Jul. 01, 2012

Analysis Of Changes In Liability For Product Warranties

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


	Quarter ended
	July 1, 2012			July 3, 2011

Balance at beginning of period	$	42,067		$	36,006
Current period provisions		5,596			6,185
Costs incurred		(4,495	)		(4,441	)
Foreign exchange and other		(680	)		435

Balance at end of period	$	42,488		$	38,185

Restructuring Plans (Tables)

3 Months Ended

Jul. 01, 2012

Reconciliation of Restructuring Reserve

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


	Employee Severance
Balance at March 31, 2012	$	1,186

Accrued		370
Costs incurred		(510	)
Foreign currency impact and other		(35	)


Balance at July 1, 2012	$	1,011

Debt (Tables)

3 Months Ended

Jul. 01, 2012

Long-Term Debt And Capital Lease Obligations

The following summarizes the Company’s long-term debt including capital lease obligations:


	July 1, 2012		March 31, 2012
3.375% Convertible Notes, net of discount, due 2038	$	149,968	$	148,272
2011 Credit Facility due 2016		94,900		79,400
China Term Loan due 2017		11,172		6,034
India Term Loan due 2017		4,642		5,383
Capital lease obligations and other		744		970


		261,426		240,059
Less current portion		2,789		2,949


Total long-term debt and capital lease obligations	$	258,637	$	237,110

Components Of Net Carrying Amount Of Convertible Notes


	July 1, 2012			March 31, 2012

Principal	$	172,500		$	172,500
Unamortized discount		(22,532	)		(24,228	)

Net carrying amount	$	149,968		$	148,272

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

Retirement Plans (Tables)

3 Months Ended

Jul. 01, 2012

Net Periodic Benefit Cost Related To Defined Benefit Pension Plans

The following tables present the components of the Company’s net periodic benefit cost related to its defined benefit pension plans:


	United States Plans						International Plans
	Quarter Ended						Quarter Ended
	July 1, 2012			July 3, 2011			July 1, 2012			July 3, 2011

Service cost	$	81		$	70		$	177		$	181
Interest cost		164			166			594			653
Expected return on plan assets		(189	)		(176	)		(464	)		(458	)
Amortization and deferral		100			58			52			7

Net periodic benefit cost	$	156		$	118		$	359		$	383

- Definition

Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans.

+ References

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+ Details

Stockholders' Equity (Tables)

3 Months Ended

Jul. 01, 2012

Change In Number Of Shares Of Common Stock Outstanding

The following demonstrates the change in the number of shares of Common Stock outstanding during the first quarter ended July 1, 2012:


Shares outstanding as of March 31, 2012			47,800,129
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes			217,392

Shares outstanding as of July 1, 2012			48,017,521

Components Of Accumulated Other Comprehensive Income

The components of accumulated other comprehensive income are as follows:


	March 31, 2012			Before-Tax Amount			Tax Benefit (Expense)		Net-of-Tax Amount			July 1, 2012

Pension funded status adjustment	$	(8,982	)	$	215		$	—	$	215		$	(8,767	)
Unrealized gain (loss) on derivative instruments		1,175			(8,482	)		3,136		(5,346	)		(4,171	)
Foreign currency translation adjustment		81,900			(31,451	)		—		(31,451	)		50,449


Accumulated other comprehensive income	$	74,093		$	(39,718	)	$	3,136	$	(36,582	)	$	37,511

Earnings Per Share (Tables)

3 Months Ended

Jul. 01, 2012

Weighted Average Common Shares-Basic And Common Shares-Diluted

The following table sets forth the reconciliation from basic to diluted average common shares and the calculations of net earnings per common share:


	Quarter ended
	July 1, 2012		July 3, 2011

Net earnings attributable to EnerSys stockholders	$	45,804	$	33,496

Average common shares:
Basic (weighted average outstanding shares)		47,901,203		50,052,627
Dilutive potential common shares from exercise and lapse of equity awards, net of shares assumed reacquired		525,788		615,649


Diluted (weighted average outstanding shares)		48,426,991		50,668,276


Basic earnings per common share attributable to EnerSys stockholders	$	0.96	$	0.67

Diluted earnings per common share attributable to EnerSys stockholders	$	0.95	$	0.66

Anti-dilutive equity awards not included in weighted average common shares – diluted		107,217		317,435

Business Segments (Tables)

3 Months Ended

Jul. 01, 2012

Schedule Of Financial Data For Company's Reportable Business Segments And Product Lines

The following table provides selected financial data for the Company’s reportable business segments and product lines:


	Quarter ended
	July 1, 2012			July 3, 2011
Net sales by segment to unaffiliated customers
Europe	$	237,051		$	252,992
Americas		288,924			259,228
Asia		67,935			57,009


Total net sales	$	593,910		$	569,229


Net sales by product line
Reserve power	$	289,294		$	265,936
Motive power		304,616			303,293


Total net sales	$	593,910		$	569,229


Intersegment sales
Europe	$	22,162		$	16,132
Americas		10,554			10,146
Asia		6,359			3,054


Total intersegment sales ⁽¹⁾	$	39,075		$	29,332


Operating earnings by segment
Europe	$	17,220		$	14,137
Americas		44,514			31,618
Asia		8,891			3,370
Restructuring charges (Europe)		(370	)		(410	)


Total operating earnings ⁽²⁾	$	70,255		$	48,715

(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.

- Definition

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.

+ References + Details

Summary of Inventories (Detail) - USD ($) $ in Thousands	Jul. 01, 2012	Mar. 31, 2012
Schedule of Inventory [Line Items]
Raw materials	$ 93,669	$ 100,538
Work-in-process	111,348	111,629
Finished goods	145,029	149,607
Total	$ 350,046	$ 361,774

Inventories - Additional Information (Detail) - USD ($) $ in Thousands	Jul. 01, 2012	Mar. 31, 2012
Inventory Disclosure [Line Items]
Inventory reserves for obsolescence and other estimated losses	$ 15,983	$ 14,831

- Definition

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.

+ References

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

+ Details

Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jul. 01, 2012	Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ (7,182)	$ (3,941)
Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(3,076)	(3,872)
Lead hedge forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(4,308)	(851)
Foreign currency forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	202	782
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(7,182)	(3,941)
Fair Value, Inputs, Level 2 \| Interest rate swap agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(3,076)	(3,872)
Fair Value, Inputs, Level 2 \| Lead hedge forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	(4,308)	(851)
Fair Value, Inputs, Level 2 \| Foreign currency forward contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total derivatives	$ 202	$ 782

Fair Value of Financial Instruments - Additional Information (Detail) - Convertible Notes Payable - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 01, 2012	Mar. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of debt instrument	$ 172,500	$ 172,500
Debt Instrument Interest Rate	3.375%
Price of stock per share when convertible notes were issued		$ 30.19
Closing price of stock	$ 35.07
Conversion option price per share	$ 40.60
Trading of convertible notes, face value, disclosed as a percentage	112.00%	116.00%

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

Jul. 01, 2012

Mar. 31, 2012

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

Derivatives assets, Carrying Amount

^[1]

$ 202

$ 782

Derivatives liabilities, Carrying Amount

^[1]

7,384

4,723

Derivatives assets, Fair Value

^[1]

202

782

Derivatives liabilities, Fair Value

^[1]

7,384

4,723

Convertible Notes Payable

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

Convertible Notes, Carrying Amount

^[2]

149,968

148,272

Convertible Notes, Fair Value

^[3]

$ 193,200

$ 200,100

[1]	Represents interest rate swap agreements, lead and foreign currency hedges (see Note 4 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at July 1, 2012 and March 31, 2012).
[2]	The carrying amounts of the Convertible Notes at July 1, 2012 and March 31, 2012 represent the $172,500 principal value, less the unamortized debt discount (see Note 9).
[3]	The fair value amounts of the Convertible Notes at July 1, 2012 and March 31, 2012 represent the trading values of the Convertible Notes with a principal value of $172,500.

Carrying Amounts and Estimated Fair Values of Company Financial Instruments (Parenthetical) (Detail) - USD ($) $ in Thousands	Jul. 01, 2012	Mar. 31, 2012
Convertible Notes Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of debt instrument	$ 172,500	$ 172,500

Derivative Financial Instruments - Additional Information (Detail) $ in Thousands, lb in Millions	3 Months Ended
	Jul. 01, 2012 USD ($) lb	Jul. 03, 2011 USD ($)	Mar. 31, 2012 USD ($) lb
Derivatives, Fair Value [Line Items]
Foreign currency forward contracts	$ 53,318		$ 42,121
Foreign currency contract, maturity	1 year
Interest rate swap agreements converted into fixed rate basis	$ 85,000		$ 85,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Change in fair value recorded in other (income) expense, net	15	$ 710
Cost of Sales
Derivatives, Fair Value [Line Items]
Derivative gain (loss) to be recorded in income within 12 months, before tax	$ 6,495
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Notional amount in pounds \| lb	60.5		60.0
Hedge forward contracts, maturity	1 year
Interest rate swap agreements \| Minimum
Derivatives, Fair Value [Line Items]
Derivative, maturity date	Feb. 01, 2013
Interest rate swap agreements \| Maximum
Derivatives, Fair Value [Line Items]
Derivative, maturity date	May 01, 2013
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Change in fair value recorded in other (income) expense, net	$ 114
Notional amount	$ 30,582		$ 11,410

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

Jul. 01, 2012

Mar. 31, 2012

Derivatives, Fair Value [Line Items]

Derivatives assets, Fair Value

^[1]

$ 202

$ 782

Derivatives liabilities, Fair Value

^[1]

7,384

4,723

Designated as Hedging Instrument

Derivatives, Fair Value [Line Items]

Derivatives assets, Fair Value

284

700

Derivatives liabilities, Fair Value

4,308

881

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

Derivatives, Fair Value [Line Items]

Derivatives assets, Fair Value

284

670

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

Derivatives, Fair Value [Line Items]

Derivatives assets, Fair Value

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

Derivatives, Fair Value [Line Items]

Derivatives liabilities, Fair Value

4,137

881

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

Derivatives, Fair Value [Line Items]

Derivatives liabilities, Fair Value

171

Not Designated as Hedging Instrument

Derivatives, Fair Value [Line Items]

Derivatives assets, Fair Value

112

Derivatives liabilities, Fair Value

3,158

3,872

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

Derivatives, Fair Value [Line Items]

Derivatives assets, Fair Value

112

Not Designated as Hedging Instrument | Accrued expenses | Foreign currency forward contracts

Derivatives, Fair Value [Line Items]

Derivatives liabilities, Fair Value

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

Derivatives, Fair Value [Line Items]

Derivatives liabilities, Fair Value

$ 3,076

3,628

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

Derivatives, Fair Value [Line Items]

Derivatives liabilities, Fair Value

$ 244

[1]	Represents interest rate swap agreements, lead and foreign currency hedges (see Note 4 for asset and liability positions of the interest rate swap agreements, lead and foreign currency hedges at July 1, 2012 and March 31, 2012).

Effect of Derivative Instruments on Consolidated Condensed Statements of Income (Detail) - Dedesignated As Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (5,706)	$ (1,266)
Gain (Loss) Reclassified from AOCI (Effective Portion)	2,776	(2,830)
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(6,413)	(1,422)
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	707	156
Cost of Sales \| Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	1,498	(895)
Cost of Sales \| Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Gain (Loss) Reclassified from AOCI (Effective Portion)	$ 1,278	$ (1,935)

Effect of Derivative Instruments (Detail) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (129)	$ (710)
Interest rate swap agreements \| Other (Income) Expense
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	(15)	$ (710)
Foreign currency forward contracts \| Other (Income) Expense
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Income on Derivatives	$ (114)

Income Taxes - Additional Information (Detail)	3 Months Ended
Income Taxes - Additional Information (Detail)	Jul. 01, 2012	Jul. 03, 2011
Income Tax Contingency [Line Items]
Effective income tax rates	29.10%	24.00%

Analysis of Changes in Liability for Product Warranties (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Product Warranty Liability [Line Items]
Balance at beginning of period	$ 42,067	$ 36,006
Current period provisions	5,596	6,185
Costs incurred	(4,495)	(4,441)
Foreign exchange and other	(680)	435
Balance at end of period	$ 42,488	$ 38,185

Commitments Contingencies and Litigation - Additional Information (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 01, 2012 USD ($) lb	Mar. 31, 2012 USD ($) lb
Lead hedge forward contracts
Commitments, Contingencies And Litigation [Line Items]
Purchase price of hedges, pounds of lead \| lb	60,500	60,000
Purchase price of hedges	$ 55,397	$ 56,610
Foreign currency forward contracts
Commitments, Contingencies And Litigation [Line Items]
Purchase price of hedges	83,900	53,531
Interest rate swap agreements
Commitments, Contingencies And Litigation [Line Items]
Convertible interest rate swap	$ 85,000	$ 85,000
Interest rate swap agreements \| Minimum
Commitments, Contingencies And Litigation [Line Items]
Interest rate swap agreements expiration date	Feb. 01, 2013
Interest rate swap agreements \| Maximum
Commitments, Contingencies And Litigation [Line Items]
Interest rate swap agreements expiration date	May 01, 2013

Restructuring Plans - Additional Information (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Jul. 01, 2012 USD ($)	Jul. 03, 2011 USD ($)	Mar. 31, 2012 USD ($) Employee	Mar. 31, 2011 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 370	$ 410
European Operations
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees \| Employee				60
Severance-related costs				$ 5,200
Restructuring reserve	408
Europe
Restructuring Cost and Reserve [Line Items]
Restructuring charges incurred to date	0		$ 5,178	5,178
Charges related to restructuring plan	121		$ 4,579	$ 4,579
German Operation
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees \| Employee			80
Severance-related costs			$ 4,200
Restructuring charges incurred to date			3,070
Charges related to restructuring plan	389		$ 2,433
Restructuring reserve	603
Restructuring charges	370
Expected additional restructuring charges	$ 760

Reconciliation of Restructuring Reserve (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Restructuring Cost and Reserve [Line Items]
Accrued	$ 370	$ 410
Employee Severance
Restructuring Cost and Reserve [Line Items]
Beginning Balance	1,186
Accrued	370
Costs incurred	(510)
Foreign currency impact and other	(35)
Ending Balance	$ 1,011

Long Term Debt and Capital Lease Obligations (Detail) - USD ($) $ in Thousands	Jul. 01, 2012	Mar. 31, 2012
Debt Instrument [Line Items]
Capital lease obligations and other	$ 744	$ 970
Gross long-term debt and capital lease obligations	261,426	240,059
Less current portion	2,789	2,949
Total long-term debt and capital lease obligations	258,637	237,110
Convertible Notes Payable
Debt Instrument [Line Items]
Long-term debt	149,968	148,272
2011 Credit Facility Due 2016
Debt Instrument [Line Items]
Long-term debt	94,900	79,400
China Term Loan due 2017
Debt Instrument [Line Items]
Long-term debt	11,172	6,034
India Term Loan due 2017
Debt Instrument [Line Items]
Long-term debt	$ 4,642	$ 5,383

Long Term Debt and Capital Lease Obligations (Parenthetical) (Detail)	3 Months Ended
	Jul. 01, 2012
Convertible Notes Payable
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

Components of Net Carrying Amount of Convertible Notes (Detail) - Convertible Notes Payable - USD ($) $ in Thousands	Jul. 01, 2012	Mar. 31, 2012
Debt Instrument [Line Items]
Principal	$ 172,500	$ 172,500
Unamortized discount	(22,532)	(24,228)
Net carrying amount	149,968	148,272
Carrying amount of equity component	$ 29,850	$ 29,850

Debt - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Mar. 31, 2012
Debt Instrument [Line Items]
Amortized remaining discount period	35 months
Aggregate consideration on conversion shares	4,248,761
Bank guarantees	$ 0		$ 0
Convertible Notes Payable
Debt Instrument [Line Items]
Face value of debt instrument	$ 172,500		172,500
Conversion option price per share	$ 40.60
Interest rate percentage	8.50%
Amount of interest cost recognized for the amortization of the discount	$ 1,696	$ 1,558
Available lines of credit	357,554		377,230
Outstanding amount	97,375		95,340
Stand by letters of credit	$ 9,100		$ 9,108

Net Periodic Benefit Cost Related to Defined Benefit Pension Plans (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 81	$ 70
Interest cost	164	166
Expected return on plan assets	(189)	(176)
Amortization and deferral	100	58
Net periodic benefit cost	156	118
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	177	181
Interest cost	594	653
Expected return on plan assets	(464)	(458)
Amortization and deferral	52	7
Net periodic benefit cost	$ 359	$ 383

- Definition

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.

+ References

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.

+ Details

- Definition

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.

+ References + Details

- Definition

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.

+ References

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.

+ Details

Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	3,177,477
Equity-based compensation expense	$ 3,373	$ 2,718
Share-based compensation, tax benefit	978	653
Net cash (paid) received, reflecting the cost of equity awards surrendered for option price and withholding taxes	$ 870	$ 763
Market Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding	638,688		346,563
Market Stock Units \| Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Stock unit grants during period	292,125	224,397
Non-Qualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding	581,183		633,663
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options exercised	49,980	79,800
Vested restricted stock and restricted stock units	226,593	243,676
Stock option grants outstanding	592,349		617,240
Restricted Stock Units (RSUs) \| Management
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of restricted stock units granted, vested per year	25.00%
Vesting period	4 years
Stock unit grants during period	202,452	96,840

Change in Number of Shares of Common Stock Outstanding (Detail)	3 Months Ended
	Jul. 01, 2012 USD ($) shares
Stockholders Equity [Line Items]
Shares outstanding, beginning balance	47,800,129
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes \| $	$ 217,392
Shares outstanding, ending balance	48,017,521

- Definition

Value of stock (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 stock value of such awards forfeited. Stock 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.

+ References + Details

Stockholders Equity - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 03, 2011	Jul. 01, 2012	Mar. 31, 2012
Stockholders Equity [Line Items]
Number of shares of common stock purchased	294,200
Repurchased common stock value	$ 9,753
Treasury stock, shares		4,446,885	4,446,885

- Definition

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

+ References + Details

Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Stockholders Equity [Line Items]
Pension funded status adjustment, January 1, 2012	$ (8,767)
Unrealized gain (loss) on derivative instruments, January 1, 2012	(4,171)
Foreign currency translation adjustment, January 1, 2012	50,449
Accumulated other comprehensive income, January 1, 2012	37,511
Pension funded status adjustment, Before-Tax Amount	215
Unrealized gain (loss) on derivative instruments, Before-Tax Amount	(8,482)
Foreign currency translation adjustment, Before-Tax Amount	(31,451)
Accumulated other comprehensive income, Before-Tax Amount	(39,718)
Pension funded status adjustment, Tax Benefit (Expense)
Unrealized gain (loss) on derivative instruments, Tax Benefit (Expense)	3,136
Foreign currency translation adjustment, Tax Benefit (Expense)
Accumulated other comprehensive income, Tax Benefit (Expense)	3,136
Pension funded status adjustment	215	$ (27)
Unrealized gain (loss) on derivative instruments	(5,346)
Foreign currency translation adjustment	(31,451)
Accumulated other comprehensive income	$ (36,582)

Weighted Average Common Shares Basic and Common Shares Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 01, 2012	Jul. 03, 2011
Earnings Per Share Disclosure [Line Items]
Net earnings attributable to EnerSys stockholders	$ 45,804	$ 33,496
Basic (weighted average outstanding shares)	47,901,203	50,052,627
Dilutive potential common shares from exercise and lapse of equity awards, net of shares assumed reacquired	525,788	615,649
Diluted (weighted average outstanding shares)	48,426,991	50,668,276
Basic earnings per common share attributable to EnerSys stockholders	$ 0.96	$ 0.67
Diluted earnings per common share attributable to EnerSys stockholders	$ 0.95	$ 0.66
Anti-dilutive equity awards not included in weighted average common shares - diluted	107,217	317,435

- Definition

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.

+ References

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
-SubTopic 10
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-Paragraph 1
-Subparagraph (c)
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-Name Statement of Financial Accounting Standard (FAS)
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-Subparagraph c
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-Paragraph 4
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+ Details

- Definition

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

+ References

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-Paragraph 18
-Article 7

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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

+ Details

- Definition

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.

+ References + Details

- Definition

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

+ References

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

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-URI http://asc.fasb.org/extlink&oid=6519514

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+ Details

- Definition

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.

+ References + Details

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Earnings Per Share - Additional Information (Detail)	3 Months Ended
Earnings Per Share - Additional Information (Detail)	Jul. 01, 2012 shares
Earnings Per Share Disclosure [Line Items]
Number of common shares issue upon conversion	4,248,761

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

3 Months Ended

Jul. 01, 2012

Jul. 03, 2011

Segment Reporting Information [Line Items]

Total net sales

$ 593,910

$ 569,229

Total intersegment sales

^[1]

39,075

29,332

Net sales revenue by services

593,910

569,229

Total operating earnings

^[2]

70,255

48,715

Restructuring charges

(370)

(410)

Reserve Power

Segment Reporting Information [Line Items]

Net sales revenue by services

289,294

265,936

Motive Power

Segment Reporting Information [Line Items]

Net sales revenue by services

304,616

303,293

Europe

Segment Reporting Information [Line Items]

Total net sales

237,051

252,992

Total intersegment sales

22,162

16,132

Total operating earnings

17,220

14,137

Restructuring charges

(370)

(410)

Americas

Segment Reporting Information [Line Items]

Total net sales

288,924

259,228

Total intersegment sales

10,554

10,146

Total operating earnings

44,514

31,618

Asia

Segment Reporting Information [Line Items]

Total net sales

67,935

57,009

Total intersegment sales

6,359

3,054

Total operating earnings

$ 8,891

$ 3,370

[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.

Label	Element	Value
Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	$ 1,175,000
Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	81,900,000
Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	$ 8,982,000

- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References + Details

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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+ Details