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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Sep. 30, 2018	Nov. 02, 2018
Document Information [Line Items]
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Entity Registrant Name	EnerSys
Entity Central Index Key	0001289308
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Fiscal Year Focus	2019
Trading Symbol	ENS
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		42,148,391

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 545,183	$ 522,118
Accounts receivable, net of allowance for doubtful accounts: September 30, 2018 - $9,913; March 31, 2018 - $12,643	519,542	546,325
Total	396,404	414,234
Prepaid and other current assets	81,823	56,910
Total current assets	1,542,952	1,539,587
Property, plant, and equipment, net	398,173	390,260
Goodwill	339,441	352,805
Other intangible assets, net	141,229	147,141
Deferred taxes	43,184	44,402
Other assets	13,602	12,730
Total assets	2,478,581	2,486,925
Current liabilities:
Short-term debt	14,071	18,341
Accounts payable	249,934	258,982
Accrued expenses	189,834	214,207
Total current liabilities	453,839	491,530
Long-term Debt, Excluding Current Maturities	599,662	579,535
Deferred taxes	34,427	33,607
Other liabilities	187,851	181,142
Total liabilities	1,275,779	1,285,814
Commitments and contingencies
Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at September 30, 2018 and at March 31, 2018	0	0
Common Stock, $0.01 par value per share, 135,000,000 shares authorized; 54,828,496 shares issued and 42,148,391 shares outstanding at September 30, 2018; 54,595,105 shares issued and 41,915,000 shares outstanding at March 31, 2018	548	546
Additional paid-in capital	491,472	477,288
Treasury stock, at cost, 12,680,105 shares held as of September 30, 2018 and as of March 31, 2018	(560,991)	(560,991)
Retained earnings	1,398,758	1,320,549
Accumulated other comprehensive income	(131,882)	(41,717)
Total EnerSys stockholders' equity	1,197,905	1,195,675
Noncontrolling interests	4,897	5,436
Total equity	1,202,802	1,201,111
Total liabilities and equity	$ 2,478,581	$ 2,486,925

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 9,913	$ 12,643
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	135,000,000	135,000,000
Common stock, shares issued (in shares)	54,828,496	54,595,105
Common stock, shares outstanding (in shares)	42,148,391	41,915,000
Treasury stock (in shares)	12,680,105	12,680,105

Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Statement [Abstract]
Net sales	$ 660,462	$ 617,289	$ 1,331,392	$ 1,239,914
Cost of goods sold	499,582	457,041	1,004,652	916,208
Inventory adjustment relating to exit activities			526	0
Gross profit	160,880	160,248	326,214	323,706
Operating expenses	96,402	94,108	195,818	186,761
Restructuring charges	1,121	1,776	2,860	2,609
Operating earnings	63,357	64,364	127,536	134,336
Interest expense	6,413	6,509	12,929	12,243
Other (income) expense, net	(1,325)	2,756	(997)	6,028
Earnings before income taxes	58,269	55,099	115,604	116,065
Income tax expense	10,822	11,948	22,137	24,592
Net earnings	47,447	43,151	93,467	91,473
Net earnings (losses) attributable to noncontrolling interests	23	(71)	183	50
Net earnings attributable to EnerSys stockholders	$ 47,424	$ 43,222	$ 93,284	$ 91,423
Net earnings per common share attributable to EnerSys stockholders:
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.13	$ 1.01	$ 2.22	$ 2.12
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	1.11	1.00	2.19	2.09
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175	$ 0.35	$ 0.35
Weighted average shares of common stock outstanding:
Basic weighted-average number of common shares outstanding (in shares)	42,133,484	42,938,131	42,073,015	43,194,107
Diluted weighted-average number of common shares outstanding (in shares)	42,773,706	43,327,361	42,673,844	43,745,218

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 47,447	$ 43,151	$ 93,467	$ 91,473
Other comprehensive (loss) income:
Net unrealized (loss) gain on derivative instruments, net of tax	(6,179)	3,669	(5,174)	616
Pension funded status adjustment, net of tax	300	338	600	665
Foreign currency translation adjustment	(14,150)	28,131	(86,313)	72,848
Total other comprehensive (loss) gain, net of tax	(20,029)	32,138	(90,887)	74,129
Total comprehensive income	27,418	75,289	2,580	165,602
Comprehensive (loss) income attributable to noncontrolling interests	(200)	(6)	(539)	81
Comprehensive income attributable to EnerSys stockholders	$ 27,618	$ 75,295	$ 3,119	$ 165,521

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Cash flows from operating activities
Net earnings	$ 93,467	$ 91,473
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	27,302	26,624
Write-off of assets relating to exit activities	1,073	210
Derivatives not designated in hedging relationships:
Net losses (gains)	622	(12)
Cash settlements	(760)	(287)
Provision for doubtful accounts	132	764
Deferred income taxes	827	(445)
Non-cash interest expense	627	975
Stock-based compensation	9,129	9,523
Gain on disposal of property, plant, and equipment	(77)	(8)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(1,556)	2,412
Inventories	(21,691)	(51,089)
Prepaid and other current assets	(4,238)	(5,385)
Other assets	(1,369)	(770)
Accounts payable	864	1,912
Accrued expenses	(20,624)	(32,366)
Other liabilities	304	1,926
Net cash provided by operating activities	84,032	45,457
Cash flows from investing activities
Capital expenditures	(35,500)	(26,639)
Purchase of businesses	0	(2,964)
Proceeds from disposal of property, plant, and equipment	189	242
Net cash used in investing activities	(35,311)	(29,361)
Cash flows from financing activities
Net repayments on short-term debt	(2,854)	(5,375)
Proceeds from 2017 Term Loan	0	150,000
Repayments of 2011 Term Loan	0	(127,500)
Debt issuance costs	0	(2,677)
Option proceeds	8,264	651
Payment of taxes related to net share settlement of equity awards	(3,384)	(7,407)
Purchase of treasury stock	0	(121,191)
Dividends paid to stockholders	(14,747)	(14,967)
Other	30	0
Net cash provided by (used in) financing activities	6,809	(8,266)
Effect of exchange rate changes on cash and cash equivalents	(32,465)	31,954
Net increase in cash and cash equivalents	23,065	39,784
Cash and cash equivalents at beginning of period	522,118	500,329
Cash and cash equivalents at end of period	545,183	540,113
2017 Credit Facility, due 2022
Cash flows from financing activities
Proceeds from Revolver borrowings	84,500	343,450
Repayments of Revolver borrowings	(65,000)	(58,250)
2011 Credit Facility, due 2018
Cash flows from financing activities
Proceeds from Revolver borrowings	0	147,050
Repayments of Revolver borrowings	$ 0	$ (312,050)

Basis of Presentation	6 Months Ended
Basis of Presentation	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated condensed financial statements have been prepared in accordance with generally accepted accounting principles 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 of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included, unless otherwise disclosed. Operating results for the three months and six months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2019. The Consolidated Condensed Balance Sheet at March 31, 2018 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. The financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s 2018 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on May 30, 2018 (the “2018 Annual Report”). EnerSys (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 2019 end on July 1, 2018, September 30, 2018, December 30, 2018, and March 31, 2019, respectively. The four quarters in fiscal 2018 ended on July 2, 2017, October 1, 2017, December 31, 2017, and March 31, 2018, 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. Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” providing guidance on revenue from contracts with customers that supersedes most current revenue recognition guidance, including industry-specific guidance. The underlying principle is that an entity will recognize revenue to depict the transfer of goods or services to customers at an amount that the entity expects to be entitled to in exchange for those goods or services. The Company adopted the ASU on April 1, 2018 using the modified retrospective transition method. Under the modified retrospective transition method, the cumulative effect of applying Topic 606 to all contracts where all revenue has not been completely recognized under previously existing accounting principles that are not completed as of the date of adoption is recorded as an adjustment to the opening balance of retained earnings (if applicable) while the comparative periods are not restated and continue to be reported under the accounting standards in effect for those periods. There was no cumulative effect of adopting the standard at the date of initial application in retained earnings. Concurrent with the adoption of the ASU, the Company has updated its revenue recognition policy as follows: The Company determines revenue recognition by applying the following steps: 1. identify the contract with a customer; 2. identify the performance obligations in the contract; 3. determine the transaction price; 4. allocate the transaction price to the performance obligations; and 5. recognize revenue as the performance obligations are satisfied. The Company recognizes revenue when (or as) performance obligations are satisfied by transferring control of the performance obligation to a customer. Control of a performance obligation may transfer to the customer either at a point in time or over time depending on an evaluation of the specific facts and circumstances for each contract, including the terms and conditions of the contract as agreed with the customer, as well as the nature of the products or services to be provided. The Company's primary performance obligation to its customers is the delivery of finished goods and products, pursuant to purchase orders. Control of the products sold typically transfers to its customers at the point in time when the goods are shipped as this is also when title generally passes to its customers under the terms and conditions of our customer arrangements. Each customer purchase order sets forth the transaction price for the products and services purchased under that arrangement. Some customer arrangements include variable consideration, such as volume rebates, some of which depend upon our customers meeting specified performance criteria, such as a purchasing level over a period of time. The Company uses judgment to estimate the most likely amount of variable consideration at each reporting date. When estimating variable consideration the Company also applies judgment when considering the probability of whether a reversal of revenue could occur and only recognize revenue subject to this constraint. Service revenues related to the work performed for the Company’s customers by its maintenance technicians generally represent a separate and distinct performance obligation. Control for these services passes to the customer as the services are performed. Service revenues for the second quarter and six months of fiscal 2019 amounted to $37,105 and $69,200, respectively. A small portion of the Company's customer arrangements oblige the Company to create customized products for its customers that require the bundling of both products and services into a single performance obligation because the individual products and services that are required to fulfill the customer requirements do not meet the definitions for a distinct performance obligation. These customized products generally have no alternative use to the Company and the terms and conditions of these arrangements give the Company the enforceable right to payment for performance completed to date, including a reasonable profit margin. For these arrangements, control transfers over time and the Company measures progress towards completion by selecting the input or output method that best depicts the transfer of control of the underlying goods and services to the customer for each respective arrangement. Methods used by the Company to measure progress toward completion include labor hours, costs incurred and units of production. Revenues recognized over time for the second quarter and six months of fiscal 2019 amounted to $16,491 and $34,895, respectively. On September 30, 2018, the aggregate transaction price allocated to unsatisfied (or partially unsatisfied) performance obligations was approximately $75,420, of which, the Company estimates that approximately $33,076 will be recognized as revenue in fiscal 2019, $33,944 in fiscal 2020, $4,655 in fiscal 2021, $3,723 in fiscal 2022 and $22 in fiscal 2023. The Company's typical payment terms are 30 days and sales arrangements do not contain any significant financing component for its customers. Any payments that are received from a customer in advance, prior to the satisfaction of a related performance obligation and billings in excess of revenue recognized, are deferred and treated as a contract liability. Advance payments and billings in excess of revenue recognized are classified as current or non-current based on the timing of when recognition of revenue is expected. As of September 30, 2018, the current and non-current portion of contract liabilities were $9,518 and $7,009, respectively. As of March 31, 2018, the current and non-current portion of contract liabilities were $9,387 and $7,094, respectively. Amounts representing work completed and not billed to customers represent contract assets and were $22,805 and $24,810 as of September 30, 2018 and March 31, 2018, respectively. Revenues recognized during the second quarter and six months of fiscal 2019, that were included in the contract liability at the beginning of the current quarter and six months, amounted to $661 and $2,597, respectively. The Company uses historic customer product return data as a basis of estimation for customer returns and records the reduction of sales at the time revenue is recognized. At September 30, 2018, the right of return asset related to the value of inventory anticipated to be returned from customers was $2,647 and refund liability representing amounts estimated to be refunded to customers was $5,013. Freight charges billed to customers are included in sales and the related shipping costs are included in cost of sales in the Consolidated Condensed Statements of Income. If shipping activities are performed after a customer obtains control of a product, the Company applies a policy election to account for shipping as an activity to fulfill the promise to transfer the product to the customer. The Company applies a policy election to exclude transaction taxes collected from customers from sales when the tax is both imposed on and concurrent with a specific revenue-producing transaction. The Company generally provides customers with a product warranty that provides assurance that the products meet standard specifications and are free of defects. The Company maintains a reserve for claims incurred under standard product warranty programs. Performance obligations related to service warranties are not material to the consolidated financial statements. The Company pays sales commissions to its sales representatives which may be considered as incremental costs to obtain a contract. However, since the recoverability period is less than one year, the Company has utilized the practical expedient to record these costs of obtaining a contract as an expense as they are incurred. In March 2017, the FASB issued ASU No. 2017-07, “Compensation—Retirement Benefits (Topic 715)”, which requires an entity to report the service cost component of pension and other postretirement benefit costs in the same line item as other compensation costs. The other components of net (benefit) cost will be required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. This standard is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted and requires the retrospective method to be applied to all periods presented. The Company adopted this guidance effective April 1, 2018. The service cost component of pension expense continues to be recognized in cost of goods sold whereas other components of pension expense have been reclassified to “Other (income) expense, net” in the Condensed Consolidated Statements of Income. The Company reclassified $374 and $735, from “Cost of goods sold” relating to the second quarter and six months of 2018, respectively, to “Other (income) expense, net” in the Condensed Consolidated Statements of Income. Accounting Pronouncements Issued But Not Adopted as of September 30, 2018 In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). This update requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification will determine whether the lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. This update is effective for annual periods beginning after December 15, 2018, using a modified retrospective approach, with early adoption permitted. In order to evaluate the impact of ASU No. 2016-02, the Company has formed a project team and initiated the process of assessing critical components of this new guidance and the potential impact that the guidance will have on its financial position, results of operations and cash flows. This evaluation process includes a review of the Company's leasing contracts and an assessment of the completeness of the Company's lease population. The Company is also assessing the need for potential changes to its business processes, systems and controls to support the adoption of the new standard. Based upon the assessment to date, the Company believes that a key change upon adoption of the lease standard will be the recognition of leased assets and liabilities on its balance sheet but has not yet determined the impact on its results of operations or statement of cash flows. In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815)”: Targeted Improvements to Accounting for Hedging Activities, which amends and simplifies existing guidance in order to allow companies to more accurately present the economic effects of risk management activities in the financial statements. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted in any interim period or fiscal year before the effective date. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220)”. The new standard will allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (“Tax Act”). The amendments eliminate the stranded tax effects resulting from the Tax Act and will improve the usefulness of information reported to financial statements users. However, because the amendment only relates to the reclassification of the income tax effects of the Tax Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The guidance is effective for fiscal years beginning after December 15, 2018 with early adoption permitted, including the interim periods within those years. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements.

Inventories

6 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories, net consist of:



	September 30, 2018		March 31, 2018
Raw materials	$	100,318	$	92,216
Work-in-process	113,554		136,068
Finished goods	182,532		185,950
Total	$	396,404	$	414,234

Fair Value of Financial Instruments

6 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Recurring Fair Value Measurements

The following tables represent the financial assets and (liabilities) measured at fair value on a recurring basis as of September 30, 2018 and March 31, 2018, and the basis for that measurement:



	Total Fair Value Measurement September 30, 2018			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Lead forward contracts	$	(4,032	)	$	—	$	(4,032	)	$	—
Foreign currency forward contracts	(121		)	—		(121		)	—
Total derivatives	$	(4,153	)	$	—	$	(4,153	)	$	—



	Total Fair Value Measurement March 31, 2018			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Lead forward contracts	$	(3,877	)	$	—	$	(3,877	)	$	—
Foreign currency forward contracts	22			—		22			—
Total derivatives	$	(3,855	)	$	—	$	(3,855	)	$	—

The fair values of lead forward contracts are calculated using observable prices for lead as quoted on the London Metal Exchange (“LME”) and, therefore, were classified as Level 2 within the fair value hierarchy, as described in Note 1, Summary of Significant Accounting Policies to the Company's consolidated financial statements included in its 2018 Annual Report.

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

Financial Instruments

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

The fair value of the Company’s short-term debt and borrowings under the 2017 Credit Facility (as defined in Note 9), approximate their respective carrying value, as they are variable rate debt and the terms are comparable to market terms as of the balance sheet dates and are classified as Level 2.

The Company's 5.00% Senior Notes due 2023 (the “Notes”), with an original face value of $300,000, were issued in April 2015. The fair value of the Notes represent the trading values based upon quoted market prices and are classified as Level 2. The Notes were trading at approximately 100% and 102% of face value on September 30, 2018 and March 31, 2018, respectively.

The carrying amounts and estimated fair values of the Company’s derivatives and Notes at September 30, 2018 and March 31, 2018 were as follows:



	September 30, 2018				March 31, 2018
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial assets:
Derivatives ⁽¹⁾	$	—	$	—	$	22	$	22
Financial liabilities:
Notes ⁽²⁾	$	300,000	$	300,000	$	300,000	$	304,500
Derivatives ⁽¹⁾	4,153		4,153		3,877		3,877


(1)	Represents lead and foreign currency forward contracts (see Note 4 for asset and liability positions of the lead and foreign currency forward contracts at September 30, 2018 and March 31, 2018).

(2)

The fair value amount of the Notes at September 30, 2018 and March 31, 2018 represent the trading value of the instruments.

- 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 + Details

Derivative Financial Instruments

6 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

The Company utilizes derivative instruments to reduce its exposure to fluctuations in commodity prices and foreign exchange 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 Forward Contracts

The Company enters into lead forward contracts to fix the price for a portion of its lead purchases. Management considers the lead forward contracts to be effective against changes in the cash flows of the underlying lead purchases. The vast majority of such contracts are for a period not extending beyond one year. At September 30, 2018 and March 31, 2018, the Company has hedged the price to purchase approximately 68.9 million pounds and 62.9 million pounds of lead, respectively, for a total purchase price of $67,543 and $72,207, respectively.

Foreign Currency Forward Contracts

The Company uses foreign currency forward contracts and options to hedge a portion of the Company’s foreign currency exposures for lead, as well as other foreign currency exposures so that gains and losses on these contracts offset changes in the underlying foreign currency denominated exposures. The vast majority of such contracts are for a period not extending beyond one year. As of September 30, 2018 and March 31, 2018, the notional amount of these contracts was $54,742 and $54,164, respectively.

In the coming twelve months, the Company anticipates that $11,114 of pretax loss relating to lead and foreign currency forward contracts will be reclassified from accumulated other comprehensive income (“AOCI”) as part of cost of goods sold. This amount represents the current net 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 Consolidated Condensed Statements of Income 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

Foreign Currency Forward Contracts

The Company also enters into foreign currency forward contracts to economically hedge foreign currency fluctuations on intercompany loans and foreign currency denominated receivables and payables. These are not designated as hedging instruments and changes in fair value of these instruments are recorded directly in the Consolidated Condensed Statements of Income. As of September 30, 2018 and March 31, 2018, the notional amount of these contracts was $31,128 and $28,486, respectively.

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

September 30, 2018 and March 31, 2018



	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging Instruments
	September 30, 2018		March 31, 2018		September 30, 2018		March 31, 2018
Prepaid and other current assets
Foreign currency forward contracts	$	—	$	209	$	—	$	—
Total assets	$	—	$	209	$	—	$	—
Accrued expenses
Lead forward contracts	$	4,032	$	3,877	$	—	$	—
Foreign currency forward contracts	71		—		50		187
Total liabilities	$	4,103	$	3,877	$	50	$	187

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

For the quarter ended September 30, 2018



Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts	$	(11,524	)	Cost of goods sold	$	(3,742	)
Foreign currency forward contracts	138			Cost of goods sold	434
Total	$	(11,386	)		$	(3,308	)



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	96
Total		$	96

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

For the quarter ended October 1, 2017



Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts	$	3,896		Cost of goods sold	$	(1,892	)
Foreign currency forward contracts	(1,029		)	Cost of goods sold	(1,067		)
Total	$	2,867			$	(2,959	)



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	(36	)
Total		$	(36	)

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

For the six months ended September 30, 2018



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 forward contracts	$	(11,009	)	Cost of goods sold	$	(2,719	)
Foreign currency forward contracts	720			Cost of goods sold	(803		)
Total	$	(10,289	)		$	(3,522	)



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	(622	)
Total		$	(622	)

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

For the six months ended October 1, 2017



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 forward contracts	$	3,082		Cost of goods sold	$	(89	)
Foreign currency forward contracts	(3,088		)	Cost of goods sold	(903		)
Total	$	(6	)		$	(992	)



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	12
Total		$	12

Income Taxes	6 Months Ended
Income Taxes	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s income tax provision consists of federal, state and foreign income taxes. The tax provision for the second quarter of fiscal 2019 and 2018 was based on the estimated effective tax rates applicable for the full years ending March 31, 2019 and March 31, 2018, respectively, after giving effect to items specifically related to the interim periods. The Company’s effective income tax rate with respect to any period may be volatile based on the mix of income in the tax jurisdictions in which the Company operates, change in tax laws and the amount of the Company's consolidated income before taxes. On December 22, 2017, the Tax Cuts and Jobs Act (“Tax Act”) was enacted into law. Among the significant changes resulting from the law, the Tax Act reduced the U.S. federal income tax rate from 35% to 21% effective January 1, 2018, and required companies to pay a one-time transition tax on unrepatriated cumulative non-U.S. earnings of foreign subsidiaries and created new taxes on certain foreign sourced earnings. The U.S. federal statutory tax rate for fiscal 2019 is 21.0%. As of September 30, 2018, the Company has not completed its accounting for the tax effects of enactment of the Tax Act; however, it has made a reasonable estimate of the effects on its existing deferred tax balances and the one-time transition tax. The Company did not obtain additional information during the quarter affecting the provisional amounts initially recorded for the year ended March 31, 2018. In accordance with Staff Accounting Bulletin 118, these amounts are considered provisional and may be affected by future guidance, if and when issued. The Company’s estimate of its transition tax liability may change when the Company finalizes both the calculation of post-1986 foreign earnings and profits previously deferred from U.S. federal taxation and the amounts held in cash or other specified assets. Beginning in fiscal 2019, the global intangible low-taxed income (“GILTI”), foreign derived intangible income (“FDII”), and base-erosion and anti-abuse (“BEAT”) provisions became effective. The GILTI provisions require the Company to include in its US income tax return foreign subsidiary earnings in excess of an allowable return on the foreign subsidiary’s tangible assets. Due to the complexities of the GILTI tax rules, the Company is continuing to evaluate the application of ASC 740. Under US GAAP, the Company is allowed to make an accounting policy choice of either (1) treating the taxes due on future US inclusions in taxable income as a current-period expense when incurred (“period cost method”) or (2) factoring amounts into a Company’s measurement of its deferred taxes (“deferred method”). As of the second quarter of fiscal 2019, the Company has not elected an accounting policy treatment for which method the Company will utilize for GILTI. Based on existing legislative guidance and interpretation, the Company has estimated the impact on the tax provision of the GILTI inclusion, offset by the related foreign tax credit, and expects the annual effective tax rate to be increased by approximately 2.8%. FDII allows a new deduction for U.S. corporations up to 37.5% of foreign derived intangible income. This is an export incentive that reduces the tax on foreign derived sales and service income in excess of a base amount to 13.125%. Based upon the existing legislative guidance and interpretation, the Company has estimated the impact on the annual effective tax rate to be decreased by approximately 0.5%. The BEAT provisions eliminate the deductions of certain base-erosion payments to related foreign corporations and impose a minimum tax if greater than regular tax. The Company does not expect to be subject to BEAT in fiscal 2019. The consolidated effective income tax rates for the second quarter of fiscal 2019 and 2018 were 18.6% and 21.7%, respectively, and for the six months of fiscal 2019 and 2018 were 19.1% and 21.2%, respectively. The rate decrease in the second quarter and six months of fiscal 2019 compared to the comparable prior year periods of fiscal 2018 is primarily due to changes in the mix of earnings among tax jurisdictions and items related to the Tax Act. The Tax Act items accounted for a net decrease of 2.2% comprising a 4.5% decrease for the rate change, a 0.5% decrease for the FDII deduction and a 2.8% increase for GILTI inclusion. Foreign income as a percentage of worldwide income is estimated to be 68% for fiscal 2019 compared to 63% for fiscal 2018. The foreign effective income tax rates for the six months of fiscal 2019 and 2018 were 11.1% and 11.2%, respectively. The rate decrease compared to the prior year period is primarily due to changes in the mix of earnings among tax jurisdictions. Income from the Company's Swiss subsidiary comprised a substantial portion of the Company's overall foreign mix of income and is taxed at an effective income tax rate of approximately 6%.

Warranty

6 Months Ended

Sep. 30, 2018

Product Warranties Disclosures [Abstract]

Warranty

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



	Quarter ended						Six months ended
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Balance at beginning of period	$	49,689		$	46,677		$	50,602		$	46,116
Current period provisions	6,181			3,717			11,017			6,808
Costs incurred	(7,920		)	(3,841		)	(12,301		)	(7,037		)
Foreign currency translation adjustment	(217		)	560			(1,585		)	1,226
Balance at end of period	$	47,733		$	47,113		$	47,733		$	47,113

Commitments, Contingencies and Litigation	6 Months Ended
Commitments, Contingencies and Litigation	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Litigation	Commitments, Contingencies and Litigation Litigation and Other Legal Matters In the ordinary course of business, the Company and its subsidiaries are routinely defendants in or parties to pending and threatened legal actions and proceedings, including actions brought on behalf of various classes of claimants. These actions and proceedings are generally based on alleged violations of environmental, anticompetition, employment, contract and other laws. In some of these actions and proceedings, claims for substantial monetary damages are asserted against the Company and its subsidiaries. In the ordinary course of business, the Company and its subsidiaries are also subject to regulatory and governmental examinations, information gathering requests, inquiries, investigations, and threatened legal actions and proceedings. In connection with formal and informal inquiries by federal, state, local and foreign agencies, the Company and its subsidiaries receive numerous requests, subpoenas and orders for documents, testimony and information in connection with various aspects of their activities. European Competition Investigations Certain of the Company’s European subsidiaries had received subpoenas and requests for documents and, in some cases, interviews from, and have had on-site inspections conducted by, the competition authorities of Belgium, Germany and the Netherlands relating to conduct and anticompetitive practices of certain industrial battery participants. The Company settled the Belgian regulatory proceeding in February 2016 by acknowledging certain anticompetitive practices and conduct and agreeing to pay a fine of $1,962, which was paid in March 2016. During the first quarter of fiscal 2019, the Company paid $1,272 towards certain aspects of this matter, which are under appeal. As of September 30, 2018 and March 31, 2018, the Company had a reserve balance of $928 and $2,326, respectively. In June 2017, the Company settled a portion of its previously disclosed proceeding involving the German competition authority relating to conduct involving the Company's motive power battery business and agreed to pay a fine of $14,811, which was paid in July 2017. As of September 30, 2018 and March 31, 2018, the Company had a reserve balance of $0 relating to this matter. Also in June 2017, the German competition authority issued a fining decision related to the Company's reserve power battery business, which constitutes the remaining portion of the previously disclosed German proceeding. The Company is appealing this decision, including payment of the proposed fine of $11,415, and believes that the reserve power matter does not, based on current facts and circumstances known to management, require an accrual. The Company is not required to escrow any portion of this fine during the appeal process. In July 2017, the Company settled the Dutch regulatory proceeding and agreed to pay a fine of $11,229, which was paid in August 2017. As of September 30, 2018 and March 31, 2018, the Company had a reserve balance of $0 relating to the Dutch regulatory proceeding. As of September 30, 2018 and March 31, 2018, the Company had a total reserve balance of $928 and $2,326, respectively, in connection with these investigations and other related legal matters, included in accrued expenses on the Consolidated Condensed Balance Sheets. The foregoing estimate of losses is based upon currently available information for these proceedings. However, the precise scope, timing and time period at issue, as well as the final outcome of the investigations or customer claims, remain uncertain. Accordingly, the Company’s estimate may change from time to time, and actual losses could vary. Environmental Issues As a result of its operations, the Company is subject to various federal, state, and local, as well as international environmental laws and regulations and is exposed to the costs and risks of registering, handling, processing, storing, transporting, and disposing of hazardous substances, especially lead and acid. The Company’s operations are also subject to federal, state, local and international occupational safety and health regulations, including laws and regulations relating to exposure to lead in the workplace. The Company is responsible for certain cleanup obligations at the former Yuasa battery facility in Sumter, South Carolina, that predates its ownership of this facility. This manufacturing facility was closed in 2001 and the Company established a reserve for this facility, which was $1,082 and $1,109, as of September 30, 2018 and March 31, 2018, respectively. Based on current information, the Company’s management believes this reserve is adequate to satisfy the Company’s environmental liabilities at this facility. This facility is separate from the Company’s current metal fabrication facility in Sumter. Lead and Foreign Currency Forward Contracts To stabilize its lead costs and reduce volatility from currency movements, the Company enters into contracts with financial institutions. The vast majority of such contracts are for a period not extending beyond one year. Please refer to Note 4 - Derivative Financial Instruments for more details.

Restructuring Plans

6 Months Ended

Sep. 30, 2018

Restructuring and Related Activities [Abstract]

Restructuring Plans

During fiscal 2017, the Company announced restructuring programs to improve efficiencies primarily related to its motive power production in EMEA. The Company estimates that the total charges for these actions will amount to approximately $4,700, primarily from cash charges for employee severance-related payments and other charges. The Company estimates that these actions will result in the reduction of approximately 45 employees upon completion. During fiscal 2017, the Company recorded restructuring charges of $3,104 and an additional $1,610 during fiscal 2018. The Company incurred $749 in costs against the accrual in fiscal 2017 and an additional $2,403 during fiscal 2018. During the six months of fiscal 2019, the Company incurred $1,021 against the accrual. As of September 30, 2018, the reserve balance associated with these actions is $675. The Company does not expect to be committed to additional restructuring charges related to this action, which is expected to be completed in fiscal 2019.

During fiscal 2018, the Company announced restructuring programs to improve efficiencies primarily related to supply chain and general operations in EMEA. The Company estimates that the total charges for these actions will amount to approximately $7,700, primarily from cash charges for employee severance-related payments and other charges. The Company estimates that these actions will result in the reduction of approximately 75 employees upon completion. During fiscal 2018, the Company recorded non-cash restructuring charges of $69 and cash charges of $2,260 and incurred $1,350 in costs against the accrual. During the six months of fiscal 2019, the Company recorded restructuring charges of $2,176 and incurred $879 in costs against the accrual. As of September 30, 2018, the reserve balance associated with these actions is $2,159. The Company expects to be committed to an additional $3,100 in restructuring charges related to this action, which it expects to complete in fiscal 2020.

During fiscal 2018, the Company announced a restructuring program to improve efficiencies of its general operations in the Americas. This program was completed during the second quarter of fiscal 2019. The total charges for these actions were $960, from cash charges for employee severance-related payments to approximately 60 salaried employees. During fiscal 2018, the Company recorded restructuring charges of $960 and incurred $755 in costs against the accrual. During the six months of fiscal 2019, the Company incurred $207 in costs against the accrual.

During fiscal 2019, the Company announced a restructuring program to improve efficiencies of its reserve power operations in EMEA. The Company estimates that the total charges for these actions will amount to approximately $200, from charges primarily for employee severance-related payments to two employees. During the six months of fiscal 2019, the Company recorded restructuring charges of $23 and incurred $22 in costs against the accrual. As of September 30, 2018, the reserve balance associated with this action is $1. The Company expects to complete this action in fiscal 2019.

Other Exit Charges

During the first quarter of fiscal 2019, in an effort to improve profitability, the Company converted its India operations from mainly reserve power production to motive power production. As a result of the Company’s exit from reserve power, during the six months of fiscal 2019, the Company recorded a non-cash write off of reserve power inventories of $526, which was reported in cost of goods sold and a $547 non-cash write-off related to reserve power fixed assets in restructuring charges. In addition, during the six months of fiscal 2019, the Company also recorded a cash charge of $114 in restructuring charges.

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



	Employee Severance			Other			Total
Balance as of March 31, 2018	$	2,893		$	16		$	2,909
Accrued	2,174			139			2,313
Costs incurred	(2,091		)	(152		)	(2,243		)
Foreign currency impact	(143		)	(1		)	(144		)
Balance as of September 30, 2018	$	2,833		$	2		$	2,835

Debt

6 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Debt

The following summarizes the Company’s long-term debt as of September 30, 2018 and March 31, 2018:



	September 30, 2018				March 31, 2018
	Principal		Unamortized Issuance Costs		Principal		Unamortized Issuance Costs
5.00% Senior Notes, due 2023	$	300,000	$	2,809	$	300,000	$	3,122
2017 Credit Facility, due 2022	305,000		2,529		285,500		2,843
	$	605,000	$	5,338	$	585,500	$	5,965
Less: Unamortized issuance costs	5,338				5,965
Long-term debt, net of unamortized issuance costs	$	599,662			$	579,535

5.00% Senior Notes

The Notes bear interest at a rate of 5.00% per annum and have an original face value of $300,000. Interest is payable semiannually in arrears on April 30 and October 30 of each year and commenced on October 30, 2015. The Notes will mature on April 30, 2023, unless earlier redeemed or repurchased in full. The Notes are unsecured and unsubordinated obligations of the Company. The Notes are fully and unconditionally guaranteed (the “Guarantees”), jointly and severally, by certain of its subsidiaries that are guarantors (the “Guarantors”) under the 2017 Credit Facility. The Guarantees are unsecured and unsubordinated obligations of the Guarantors.

2017 Credit Facility

On August 4, 2017, the Company entered into a credit facility (“2017 Credit Facility”). The 2017 Credit Facility matures on September 30, 2022 and comprises a $600,000 senior secured revolving credit facility (“2017 Revolver”) and a $150,000 senior secured term loan (“2017 Term Loan”). The Company's previous credit facility (“2011 Credit Facility”) comprised a $500,000 senior secured revolving credit facility (“2011 Revolver”) and a $150,000 senior secured incremental term loan (the “2011 Term Loan”) with a maturity date of September 30, 2018. On August 4, 2017, the outstanding balance on the 2011 Revolver and the 2011 Term Loan of $240,000 and $123,750, respectively, was repaid utilizing borrowings from the 2017 Credit Facility.

As of September 30, 2018, the Company had $155,000 outstanding on the 2017 Revolver and $150,000 under the 2017 Term Loan.

The quarterly installments payable on the 2017 Term Loan are $1,875 beginning December 31, 2018, $2,813 beginning December 31, 2019 and $3,750 beginning December 31, 2020 with a final payment of $105,000 on September 30, 2022. The 2017 Credit Facility may be increased by an aggregate amount of $325,000 in revolving commitments and / or one or more new tranches of term loans, under certain conditions. Both the 2017 Revolver and the 2017 Term Loan bear interest, at the Company's option, at a rate per annum equal to either (i) the London Interbank Offered Rate (“LIBOR”) plus between 1.25% and 2.00% (currently 1.25% and based on the Company's consolidated net leverage ratio) or (ii) the Base Rate (which equals, for any day a fluctuating rate per annum equal to the highest of (a) the Federal Funds Effective Rate plus 0.50%, (b) Bank of America “Prime Rate” and (c) the Eurocurrency Base Rate plus 1%; provided that, if the Base Rate shall be less than zero, such rate shall be deemed zero). Obligations under the 2017 Credit Facility are secured by substantially all of the Company’s existing and future acquired assets, including substantially all of the capital stock of the Company’s United States subsidiaries that are guarantors under the 2017 Credit Facility and 65% of the capital stock of certain of the Company’s foreign subsidiaries that are owned by the Company’s United States subsidiaries.

The current portion of the 2017 Term Loan of $7,500 is classified as long-term debt as the Company expects to refinance the future quarterly payments with revolver borrowings under its 2017 Credit Facility.

Short-Term Debt

As of September 30, 2018 and March 31, 2018, the Company had $14,071 and $18,341, respectively, of short-term borrowings. The weighted average interest rate on these borrowings was approximately 4% and 7% at September 30, 2018 and March 31, 2018, respectively.

Letters of Credit

As of September 30, 2018 and March 31, 2018, the Company had standby letters of credit of $3,422 and $3,074, respectively.

Debt Issuance Costs

Amortization expense, relating to debt issuance costs, included in interest expense was $314 and $327, respectively, for the quarters ended September 30, 2018 and October 1, 2017 and $627 and $674 for the six months ended September 30, 2018 and October 1, 2017. Debt issuance costs, net of accumulated amortization, totaled $5,338 and $5,965, respectively, at September 30, 2018 and March 31, 2018.

Available Lines of Credit

As of September 30, 2018 and March 31, 2018, the Company had available and undrawn, under all its lines of credit, $531,132 and $613,234, respectively, including $87,857 and $150,459, respectively, of uncommitted lines of credit as of September 30, 2018 and March 31, 2018.

Retirement Plans

6 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

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
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Service cost	$	—		$	—		$	252		$	256
Interest cost	157			167			457			444
Expected return on plan assets	(135		)	(120		)	(535		)	(557		)
Amortization and deferral	36			80			304			360
Net periodic benefit cost	$	58		$	127		$	478		$	503



	United States Plans						International Plans
	Six months ended						Six months ended
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Service cost	$	—		$	—		$	507		$	499
Interest cost	316			334			927			876
Expected return on plan assets	(257		)	(240		)	(1,087		)	(1,105		)
Amortization and deferral	92			159			616			711
Net periodic benefit cost	$	151		$	253		$	963		$	981

Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of September 30, 2018, the Company maintains the 2017 Equity Incentive Plan (“2017 EIP”). The 2017 EIP reserved 4,173,554 shares of common stock for the grant of various classes of nonqualified stock options, restricted stock units, market condition-based and performance condition-based share units and other forms of equity-based compensation. The Company recognized stock-based compensation expense associated with its equity incentive plans of $4,788 for the second quarter of fiscal 2019 and $4,293 for the second quarter of fiscal 2018. Stock-based compensation expense was $9,129 for the six months of fiscal 2019 and $9,523 for the six months of fiscal 2018. The Company recognizes compensation expense using the straight-line method over the vesting period of the awards. During the six months of fiscal 2019, the Company granted to non-employee directors 32,567 restricted stock units, pursuant to the 2017 EIP. During the six months of fiscal 2019, the Company granted to management and other key employees 192,700 non-qualified stock options that vest ratably over three years from the date of grant, 45,883 performance condition-based share units and 36,646 market condition-based share units that cliff vest three years from the date of grant, and 180,132 restricted stock units that vest ratably over four years from the date of grant. Common stock activity during the six months of fiscal 2019 included the vesting of 147,977 restricted stock units and 3,507 market condition-based share units and the exercise of 130,638 stock options. As of September 30, 2018, there were 607,652 non-qualified stock options, 700,513 restricted stock units, 353,623 market condition-based share units and 45,975 performance condition-based share units outstanding.

Stockholders' Equity and Noncontrolling Interests

6 Months Ended

Sep. 30, 2018

Equity [Abstract]

Stockholders' Equity and Noncontrolling Interests

Stockholders’ Equity and Noncontrolling Interests

Common Stock

The following demonstrates the change in the number of shares of common stock outstanding during the six months ended September 30, 2018:



Shares outstanding as of March 31, 2018		41,915,000
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes		233,391
Shares outstanding as of September 30, 2018		42,148,391

Treasury Stock

At September 30, 2018 and March 31, 2018, the Company held 12,680,105 shares as treasury stock.

Accumulated Other Comprehensive Income (“AOCI ”)

The components of AOCI, net of tax, as of September 30, 2018 and March 31, 2018, are as follows:



	March 31, 2018			Before Reclassifications			Amounts Reclassified from AOCI		September 30, 2018
Pension funded status adjustment	$	(22,503	)	$	—		$	600	$	(21,903	)
Net unrealized gain (loss) on derivative instruments	(3,425		)	(7,869		)	2,695		(8,599		)
Foreign currency translation adjustment	(15,789		)	(85,591		)	—		(101,380		)
Accumulated other comprehensive (loss) income	$	(41,717	)	$	(93,460	)	$	3,295	$	(131,882	)

The following table presents reclassifications from AOCI during the second quarter ended September 30, 2018:



Components of AOCI	Amounts Reclassified from AOCI			Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships:
Net loss on cash flow hedging derivative instruments	$	3,308		Cost of goods sold
Tax benefit	(777		)
Net loss on derivative instruments, net of tax	$	2,531

Defined benefit pension costs:
Prior service costs and deferrals	$	340		Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit	(40		)
Net periodic benefit cost, net of tax	$	300

The following table presents reclassifications from AOCI during the second quarter ended October 1, 2017:



Components of AOCI	Amounts Reclassified from AOCI			Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships:
Net loss on cash flow hedging derivative instruments	$	2,959		Cost of goods sold
Tax benefit	(1,095		)
Net loss on derivative instruments, net of tax	$	1,864

Defined benefit pension costs:
Prior service costs and deferrals	$	440		Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit	(102		)
Net periodic benefit cost, net of tax	$	338

The following table presents reclassifications from AOCI during the six months ended September 30, 2018:




Components of AOCI	Amounts Reclassified from AOCI			Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships:
Net unrealized loss on derivative instruments	$	3,522		Cost of goods sold
Tax benefit	(827		)
Net unrealized loss on derivative instruments, net of tax	$	2,695

Defined benefit pension costs:
Prior service costs and deferrals	$	708		Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit	(108		)
Net periodic benefit cost, net of tax	$	600

The following table presents reclassifications from AOCI during the six months quarter ended October 1, 2017:




Components of AOCI	Amounts Reclassified from AOCI			Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships:
Net loss on cash flow hedging derivative instruments	$	992		Cost of goods sold
Tax benefit	(367		)
Net loss on derivative instruments, net of tax	$	625

Defined benefit pension costs:
Prior service costs and deferrals	$	870		Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit	(205		)
Net periodic benefit cost, net of tax	$	665

The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the six months ended September 30, 2018:



	Equity Attributable to EnerSys Stockholders			Nonredeemable Noncontrolling Interests			Total Equity
Balance as of March 31, 2018	$	1,195,675		$	5,436		$	1,201,111
Total comprehensive income:
Net earnings	93,284			183			93,467
Net unrealized loss on derivative instruments, net of tax	(5,174		)	—			(5,174		)
Pension funded status adjustment, net of tax	600			—			600
Foreign currency translation adjustment	(85,591		)	(722		)	(86,313		)
Total other comprehensive loss, net of tax	(90,165		)	(722		)	(90,887		)
Total comprehensive income (loss)	3,119			(539		)	2,580
Other changes in equity:
Cash dividends - common stock ($0.35 per share)	(14,747		)	—			(14,747		)
Other, including activity related to equity awards	13,858			—			13,858
Balance as of September 30, 2018	$	1,197,905		$	4,897		$	1,202,802

Earnings Per Share

6 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

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



	Quarter ended				Six months ended
	September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017
Net earnings attributable to EnerSys stockholders	$	47,424	$	43,222	$	93,284	$	91,423
Weighted-average number of common shares outstanding:
Basic	42,133,484		42,938,131		42,073,015		43,194,107
Dilutive effect of:
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired	640,222		389,230		600,829		551,111
Diluted weighted-average number of common shares outstanding	42,773,706		43,327,361		42,673,844		43,745,218
Basic earnings per common share attributable to EnerSys stockholders	$	1.13	$	1.01	$	2.22	$	2.12
Diluted earnings per common share attributable to EnerSys stockholders	$	1.11	$	1.00	$	2.19	$	2.09
Anti-dilutive equity awards not included in diluted weighted-average common shares	409,425		283,674		286,755		257,243

Business Segments

6 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

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;


•	EMEA, which includes Europe, the Middle East and Africa, with segment headquarters in Zug, Switzerland; and


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

Summarized financial information related to the Company's reportable segments for the second quarter and six months ended September 30, 2018 and October 1, 2017 is shown below:



	Quarter ended						Six months ended
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Net sales by segment to unaffiliated customers
Americas	$	388,574		$	341,504		$	781,148		$	696,107
EMEA	203,997			197,856			414,491			396,933
Asia	67,891			77,929			135,753			146,874
Total net sales	$	660,462		$	617,289		$	1,331,392		$	1,239,914
Net sales by product line
Reserve power	$	313,338		$	292,238		$	637,356		$	597,415
Motive power	347,124			325,051			694,036			642,499
Total net sales	$	660,462		$	617,289		$	1,331,392		$	1,239,914
Intersegment sales
Americas	$	7,888		$	8,979		$	13,746		$	16,216
EMEA	35,039			38,563			67,126			67,380
Asia	8,055			5,178			15,669			10,311
Total intersegment sales ⁽¹⁾	$	50,982		$	52,720		$	96,541		$	93,907
Operating earnings by segment
Americas	$	48,306		$	44,156		$	96,042		$	97,943
EMEA	13,829			17,802			31,032			31,576
Asia	2,343			4,182			3,848			7,426
Restructuring charges - Americas	—			(285		)	—			(285		)
Restructuring charges - EMEA	(1,007		)	(1,491		)	(2,199		)	(2,324		)
Inventory adjustment relating to exit activities - Asia	—			—			(526		)	—
Restructuring charges - Asia	(114		)	—			(661		)	—
Total operating earnings ⁽²⁾	$	63,357		$	64,364		$	127,536		$	134,336

(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.

Subsequent Events	6 Months Ended
Subsequent Events	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 29, 2018, the Company entered into an agreement to acquire all issued and outstanding shares and certain assets of select entities belonging to the Alpha Group (“Alpha”). Based in Bellingham, Washington, Alpha is a global industry leader in the comprehensive commercial-grade energy solutions for broadband, telecom, renewable, industrial and traffic customers around the world. Of the total purchase consideration of $750 million, $650 million will be payable in cash, with the remaining $100 million being payable in either cash or the Company's shares. The cash consideration will be funded using cash, existing credit facilities and new debt while any consideration payable in shares will be issued from the Company's treasury stock. The transaction is estimated to close in the next thirty (30) to sixty (60) days, subject to the satisfaction of customary closing conditions. On November 7, 2018, the Board of Directors approved a quarterly cash dividend of $0.175 per share of common stock to be paid on December 28, 2018, to stockholders of record as of December 14, 2018.

Basis of Presentation (Policies)	6 Months Ended
Basis of Presentation (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated condensed financial statements have been prepared in accordance with generally accepted accounting principles 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 of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation have been included, unless otherwise disclosed. Operating results for the three months and six months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2019. The Consolidated Condensed Balance Sheet at March 31, 2018 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. The financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s 2018 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on May 30, 2018 (the “2018 Annual Report”). EnerSys (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 2019 end on July 1, 2018, September 30, 2018, December 30, 2018, and March 31, 2019, respectively. The four quarters in fiscal 2018 ended on July 2, 2017, October 1, 2017, December 31, 2017, and March 31, 2018, 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.
Recently Adopted Accounting Pronouncements and Accounting Pronouncements Issued But Not Yet Adopted	Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” providing guidance on revenue from contracts with customers that supersedes most current revenue recognition guidance, including industry-specific guidance. The underlying principle is that an entity will recognize revenue to depict the transfer of goods or services to customers at an amount that the entity expects to be entitled to in exchange for those goods or services. The Company adopted the ASU on April 1, 2018 using the modified retrospective transition method. Under the modified retrospective transition method, the cumulative effect of applying Topic 606 to all contracts where all revenue has not been completely recognized under previously existing accounting principles that are not completed as of the date of adoption is recorded as an adjustment to the opening balance of retained earnings (if applicable) while the comparative periods are not restated and continue to be reported under the accounting standards in effect for those periods. There was no cumulative effect of adopting the standard at the date of initial application in retained earnings. Concurrent with the adoption of the ASU, the Company has updated its revenue recognition policy as follows: The Company determines revenue recognition by applying the following steps: 1. identify the contract with a customer; 2. identify the performance obligations in the contract; 3. determine the transaction price; 4. allocate the transaction price to the performance obligations; and 5. recognize revenue as the performance obligations are satisfied. The Company recognizes revenue when (or as) performance obligations are satisfied by transferring control of the performance obligation to a customer. Control of a performance obligation may transfer to the customer either at a point in time or over time depending on an evaluation of the specific facts and circumstances for each contract, including the terms and conditions of the contract as agreed with the customer, as well as the nature of the products or services to be provided. The Company's primary performance obligation to its customers is the delivery of finished goods and products, pursuant to purchase orders. Control of the products sold typically transfers to its customers at the point in time when the goods are shipped as this is also when title generally passes to its customers under the terms and conditions of our customer arrangements. Each customer purchase order sets forth the transaction price for the products and services purchased under that arrangement. Some customer arrangements include variable consideration, such as volume rebates, some of which depend upon our customers meeting specified performance criteria, such as a purchasing level over a period of time. The Company uses judgment to estimate the most likely amount of variable consideration at each reporting date. When estimating variable consideration the Company also applies judgment when considering the probability of whether a reversal of revenue could occur and only recognize revenue subject to this constraint. Service revenues related to the work performed for the Company’s customers by its maintenance technicians generally represent a separate and distinct performance obligation. Control for these services passes to the customer as the services are performed. Service revenues for the second quarter and six months of fiscal 2019 amounted to $37,105 and $69,200, respectively. A small portion of the Company's customer arrangements oblige the Company to create customized products for its customers that require the bundling of both products and services into a single performance obligation because the individual products and services that are required to fulfill the customer requirements do not meet the definitions for a distinct performance obligation. These customized products generally have no alternative use to the Company and the terms and conditions of these arrangements give the Company the enforceable right to payment for performance completed to date, including a reasonable profit margin. For these arrangements, control transfers over time and the Company measures progress towards completion by selecting the input or output method that best depicts the transfer of control of the underlying goods and services to the customer for each respective arrangement. Methods used by the Company to measure progress toward completion include labor hours, costs incurred and units of production. Revenues recognized over time for the second quarter and six months of fiscal 2019 amounted to $16,491 and $34,895, respectively. On September 30, 2018, the aggregate transaction price allocated to unsatisfied (or partially unsatisfied) performance obligations was approximately $75,420, of which, the Company estimates that approximately $33,076 will be recognized as revenue in fiscal 2019, $33,944 in fiscal 2020, $4,655 in fiscal 2021, $3,723 in fiscal 2022 and $22 in fiscal 2023. The Company's typical payment terms are 30 days and sales arrangements do not contain any significant financing component for its customers. Any payments that are received from a customer in advance, prior to the satisfaction of a related performance obligation and billings in excess of revenue recognized, are deferred and treated as a contract liability. Advance payments and billings in excess of revenue recognized are classified as current or non-current based on the timing of when recognition of revenue is expected. As of September 30, 2018, the current and non-current portion of contract liabilities were $9,518 and $7,009, respectively. As of March 31, 2018, the current and non-current portion of contract liabilities were $9,387 and $7,094, respectively. Amounts representing work completed and not billed to customers represent contract assets and were $22,805 and $24,810 as of September 30, 2018 and March 31, 2018, respectively. Revenues recognized during the second quarter and six months of fiscal 2019, that were included in the contract liability at the beginning of the current quarter and six months, amounted to $661 and $2,597, respectively. The Company uses historic customer product return data as a basis of estimation for customer returns and records the reduction of sales at the time revenue is recognized. At September 30, 2018, the right of return asset related to the value of inventory anticipated to be returned from customers was $2,647 and refund liability representing amounts estimated to be refunded to customers was $5,013. Freight charges billed to customers are included in sales and the related shipping costs are included in cost of sales in the Consolidated Condensed Statements of Income. If shipping activities are performed after a customer obtains control of a product, the Company applies a policy election to account for shipping as an activity to fulfill the promise to transfer the product to the customer. The Company applies a policy election to exclude transaction taxes collected from customers from sales when the tax is both imposed on and concurrent with a specific revenue-producing transaction. The Company generally provides customers with a product warranty that provides assurance that the products meet standard specifications and are free of defects. The Company maintains a reserve for claims incurred under standard product warranty programs. Performance obligations related to service warranties are not material to the consolidated financial statements. The Company pays sales commissions to its sales representatives which may be considered as incremental costs to obtain a contract. However, since the recoverability period is less than one year, the Company has utilized the practical expedient to record these costs of obtaining a contract as an expense as they are incurred. In March 2017, the FASB issued ASU No. 2017-07, “Compensation—Retirement Benefits (Topic 715)”, which requires an entity to report the service cost component of pension and other postretirement benefit costs in the same line item as other compensation costs. The other components of net (benefit) cost will be required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations. This standard is effective for interim and annual reporting periods beginning after December 15, 2017, with early adoption permitted and requires the retrospective method to be applied to all periods presented. The Company adopted this guidance effective April 1, 2018. The service cost component of pension expense continues to be recognized in cost of goods sold whereas other components of pension expense have been reclassified to “Other (income) expense, net” in the Condensed Consolidated Statements of Income. The Company reclassified $374 and $735, from “Cost of goods sold” relating to the second quarter and six months of 2018, respectively, to “Other (income) expense, net” in the Condensed Consolidated Statements of Income. Accounting Pronouncements Issued But Not Adopted as of September 30, 2018 In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). This update requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification will determine whether the lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. This update is effective for annual periods beginning after December 15, 2018, using a modified retrospective approach, with early adoption permitted. In order to evaluate the impact of ASU No. 2016-02, the Company has formed a project team and initiated the process of assessing critical components of this new guidance and the potential impact that the guidance will have on its financial position, results of operations and cash flows. This evaluation process includes a review of the Company's leasing contracts and an assessment of the completeness of the Company's lease population. The Company is also assessing the need for potential changes to its business processes, systems and controls to support the adoption of the new standard. Based upon the assessment to date, the Company believes that a key change upon adoption of the lease standard will be the recognition of leased assets and liabilities on its balance sheet but has not yet determined the impact on its results of operations or statement of cash flows. In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815)”: Targeted Improvements to Accounting for Hedging Activities, which amends and simplifies existing guidance in order to allow companies to more accurately present the economic effects of risk management activities in the financial statements. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those years. Early adoption is permitted in any interim period or fiscal year before the effective date. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements. In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220)”. The new standard will allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (“Tax Act”). The amendments eliminate the stranded tax effects resulting from the Tax Act and will improve the usefulness of information reported to financial statements users. However, because the amendment only relates to the reclassification of the income tax effects of the Tax Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The guidance is effective for fiscal years beginning after December 15, 2018 with early adoption permitted, including the interim periods within those years. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements.

Inventories (Tables)

6 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Summary Of Inventories

Inventories, net consist of:



	September 30, 2018		March 31, 2018
Raw materials	$	100,318	$	92,216
Work-in-process	113,554		136,068
Finished goods	182,532		185,950
Total	$	396,404	$	414,234

Fair Value of Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2018

Fair Value Disclosures [Abstract]

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 September 30, 2018 and March 31, 2018, and the basis for that measurement:



	Total Fair Value Measurement September 30, 2018			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Lead forward contracts	$	(4,032	)	$	—	$	(4,032	)	$	—
Foreign currency forward contracts	(121		)	—		(121		)	—
Total derivatives	$	(4,153	)	$	—	$	(4,153	)	$	—



	Total Fair Value Measurement March 31, 2018			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Lead forward contracts	$	(3,877	)	$	—	$	(3,877	)	$	—
Foreign currency forward contracts	22			—		22			—
Total derivatives	$	(3,855	)	$	—	$	(3,855	)	$	—

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

The carrying amounts and estimated fair values of the Company’s derivatives and Notes at September 30, 2018 and March 31, 2018 were as follows:



	September 30, 2018				March 31, 2018
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial assets:
Derivatives ⁽¹⁾	$	—	$	—	$	22	$	22
Financial liabilities:
Notes ⁽²⁾	$	300,000	$	300,000	$	300,000	$	304,500
Derivatives ⁽¹⁾	4,153		4,153		3,877		3,877


(1)	Represents lead and foreign currency forward contracts (see Note 4 for asset and liability positions of the lead and foreign currency forward contracts at September 30, 2018 and March 31, 2018).


(2)	The fair value amount of the Notes at September 30, 2018 and March 31, 2018 represent the trading value of the instruments.

Derivative Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Derivative Instruments

September 30, 2018 and March 31, 2018



	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging Instruments
	September 30, 2018		March 31, 2018		September 30, 2018		March 31, 2018
Prepaid and other current assets
Foreign currency forward contracts	$	—	$	209	$	—	$	—
Total assets	$	—	$	209	$	—	$	—
Accrued expenses
Lead forward contracts	$	4,032	$	3,877	$	—	$	—
Foreign currency forward contracts	71		—		50		187
Total liabilities	$	4,103	$	3,877	$	50	$	187

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 September 30, 2018



Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts	$	(11,524	)	Cost of goods sold	$	(3,742	)
Foreign currency forward contracts	138			Cost of goods sold	434
Total	$	(11,386	)		$	(3,308	)



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	96
Total		$	96

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

For the quarter ended October 1, 2017



Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts	$	3,896		Cost of goods sold	$	(1,892	)
Foreign currency forward contracts	(1,029		)	Cost of goods sold	(1,067		)
Total	$	2,867			$	(2,959	)



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	(36	)
Total		$	(36	)

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

For the six months ended September 30, 2018



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 forward contracts	$	(11,009	)	Cost of goods sold	$	(2,719	)
Foreign currency forward contracts	720			Cost of goods sold	(803		)
Total	$	(10,289	)		$	(3,522	)



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	(622	)
Total		$	(622	)

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

For the six months ended October 1, 2017



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 forward contracts	$	3,082		Cost of goods sold	$	(89	)
Foreign currency forward contracts	(3,088		)	Cost of goods sold	(903		)
Total	$	(6	)		$	(992	)



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	12
Total		$	12

- 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

Warranty (Tables)

6 Months Ended

Sep. 30, 2018

Product Warranties Disclosures [Abstract]

Analysis Of Changes In Liability For Product Warranties

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



	Quarter ended						Six months ended
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Balance at beginning of period	$	49,689		$	46,677		$	50,602		$	46,116
Current period provisions	6,181			3,717			11,017			6,808
Costs incurred	(7,920		)	(3,841		)	(12,301		)	(7,037		)
Foreign currency translation adjustment	(217		)	560			(1,585		)	1,226
Balance at end of period	$	47,733		$	47,113		$	47,733		$	47,113

Restructuring Plans (Tables)

6 Months Ended

Sep. 30, 2018

Restructuring and Related Activities [Abstract]

Reconciliation of Restructuring Reserve

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



	Employee Severance			Other			Total
Balance as of March 31, 2018	$	2,893		$	16		$	2,909
Accrued	2,174			139			2,313
Costs incurred	(2,091		)	(152		)	(2,243		)
Foreign currency impact	(143		)	(1		)	(144		)
Balance as of September 30, 2018	$	2,833		$	2		$	2,835

Debt (Tables)

6 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Long-Term Debt And Capital Lease Obligations

The following summarizes the Company’s long-term debt as of September 30, 2018 and March 31, 2018:



	September 30, 2018				March 31, 2018
	Principal		Unamortized Issuance Costs		Principal		Unamortized Issuance Costs
5.00% Senior Notes, due 2023	$	300,000	$	2,809	$	300,000	$	3,122
2017 Credit Facility, due 2022	305,000		2,529		285,500		2,843
	$	605,000	$	5,338	$	585,500	$	5,965
Less: Unamortized issuance costs	5,338				5,965
Long-term debt, net of unamortized issuance costs	$	599,662			$	579,535

Retirement Plans (Tables)

6 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

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
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Service cost	$	—		$	—		$	252		$	256
Interest cost	157			167			457			444
Expected return on plan assets	(135		)	(120		)	(535		)	(557		)
Amortization and deferral	36			80			304			360
Net periodic benefit cost	$	58		$	127		$	478		$	503



	United States Plans						International Plans
	Six months ended						Six months ended
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Service cost	$	—		$	—		$	507		$	499
Interest cost	316			334			927			876
Expected return on plan assets	(257		)	(240		)	(1,087		)	(1,105		)
Amortization and deferral	92			159			616			711
Net periodic benefit cost	$	151		$	253		$	963		$	981

Stockholders' Equity and Noncontrolling Interests (Tables)

6 Months Ended

Sep. 30, 2018

Equity [Abstract]

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 six months ended September 30, 2018:



Shares outstanding as of March 31, 2018		41,915,000
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes		233,391
Shares outstanding as of September 30, 2018		42,148,391

Components Of Accumulated Other Comprehensive Income

The components of AOCI, net of tax, as of September 30, 2018 and March 31, 2018, are as follows:



	March 31, 2018			Before Reclassifications			Amounts Reclassified from AOCI		September 30, 2018
Pension funded status adjustment	$	(22,503	)	$	—		$	600	$	(21,903	)
Net unrealized gain (loss) on derivative instruments	(3,425		)	(7,869		)	2,695		(8,599		)
Foreign currency translation adjustment	(15,789		)	(85,591		)	—		(101,380		)
Accumulated other comprehensive (loss) income	$	(41,717	)	$	(93,460	)	$	3,295	$	(131,882	)

Reclassification from Accumulated Other Comprehensive Income

The following table presents reclassifications from AOCI during the second quarter ended September 30, 2018:



Components of AOCI	Amounts Reclassified from AOCI			Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships:
Net loss on cash flow hedging derivative instruments	$	3,308		Cost of goods sold
Tax benefit	(777		)
Net loss on derivative instruments, net of tax	$	2,531

Defined benefit pension costs:
Prior service costs and deferrals	$	340		Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit	(40		)
Net periodic benefit cost, net of tax	$	300

The following table presents reclassifications from AOCI during the second quarter ended October 1, 2017:



Components of AOCI	Amounts Reclassified from AOCI			Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships:
Net loss on cash flow hedging derivative instruments	$	2,959		Cost of goods sold
Tax benefit	(1,095		)
Net loss on derivative instruments, net of tax	$	1,864

Defined benefit pension costs:
Prior service costs and deferrals	$	440		Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit	(102		)
Net periodic benefit cost, net of tax	$	338

The following table presents reclassifications from AOCI during the six months ended September 30, 2018:




Components of AOCI	Amounts Reclassified from AOCI			Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships:
Net unrealized loss on derivative instruments	$	3,522		Cost of goods sold
Tax benefit	(827		)
Net unrealized loss on derivative instruments, net of tax	$	2,695

Defined benefit pension costs:
Prior service costs and deferrals	$	708		Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit	(108		)
Net periodic benefit cost, net of tax	$	600

The following table presents reclassifications from AOCI during the six months quarter ended October 1, 2017:




Components of AOCI	Amounts Reclassified from AOCI			Location of (Gain) Loss Recognized on Income Statement
Derivatives in Cash Flow Hedging Relationships:
Net loss on cash flow hedging derivative instruments	$	992		Cost of goods sold
Tax benefit	(367		)
Net loss on derivative instruments, net of tax	$	625

Defined benefit pension costs:
Prior service costs and deferrals	$	870		Net periodic benefit cost, included in other (income) expense, net - See Note 1 and 10
Tax benefit	(205		)
Net periodic benefit cost, net of tax	$	665

Equity Attributable To Parent And Noncontrolling Interests [Table Text Block]

The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the six months ended September 30, 2018:



	Equity Attributable to EnerSys Stockholders			Nonredeemable Noncontrolling Interests			Total Equity
Balance as of March 31, 2018	$	1,195,675		$	5,436		$	1,201,111
Total comprehensive income:
Net earnings	93,284			183			93,467
Net unrealized loss on derivative instruments, net of tax	(5,174		)	—			(5,174		)
Pension funded status adjustment, net of tax	600			—			600
Foreign currency translation adjustment	(85,591		)	(722		)	(86,313		)
Total other comprehensive loss, net of tax	(90,165		)	(722		)	(90,887		)
Total comprehensive income (loss)	3,119			(539		)	2,580
Other changes in equity:
Cash dividends - common stock ($0.35 per share)	(14,747		)	—			(14,747		)
Other, including activity related to equity awards	13,858			—			13,858
Balance as of September 30, 2018	$	1,197,905		$	4,897		$	1,202,802

Earnings Per Share (Tables)

6 Months Ended

Sep. 30, 2018

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares



	Quarter ended				Six months ended
	September 30, 2018		October 1, 2017		September 30, 2018		October 1, 2017
Net earnings attributable to EnerSys stockholders	$	47,424	$	43,222	$	93,284	$	91,423
Weighted-average number of common shares outstanding:
Basic	42,133,484		42,938,131		42,073,015		43,194,107
Dilutive effect of:
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired	640,222		389,230		600,829		551,111
Diluted weighted-average number of common shares outstanding	42,773,706		43,327,361		42,673,844		43,745,218
Basic earnings per common share attributable to EnerSys stockholders	$	1.13	$	1.01	$	2.22	$	2.12
Diluted earnings per common share attributable to EnerSys stockholders	$	1.11	$	1.00	$	2.19	$	2.09
Anti-dilutive equity awards not included in diluted weighted-average common shares	409,425		283,674		286,755		257,243

Business Segments Business Segments (Tables)

6 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Selected Financial Data for Reportable Business Segments and Product Lines

Summarized financial information related to the Company's reportable segments for the second quarter and six months ended September 30, 2018 and October 1, 2017 is shown below:



	Quarter ended						Six months ended
	September 30, 2018			October 1, 2017			September 30, 2018			October 1, 2017
Net sales by segment to unaffiliated customers
Americas	$	388,574		$	341,504		$	781,148		$	696,107
EMEA	203,997			197,856			414,491			396,933
Asia	67,891			77,929			135,753			146,874
Total net sales	$	660,462		$	617,289		$	1,331,392		$	1,239,914
Net sales by product line
Reserve power	$	313,338		$	292,238		$	637,356		$	597,415
Motive power	347,124			325,051			694,036			642,499
Total net sales	$	660,462		$	617,289		$	1,331,392		$	1,239,914
Intersegment sales
Americas	$	7,888		$	8,979		$	13,746		$	16,216
EMEA	35,039			38,563			67,126			67,380
Asia	8,055			5,178			15,669			10,311
Total intersegment sales ⁽¹⁾	$	50,982		$	52,720		$	96,541		$	93,907
Operating earnings by segment
Americas	$	48,306		$	44,156		$	96,042		$	97,943
EMEA	13,829			17,802			31,032			31,576
Asia	2,343			4,182			3,848			7,426
Restructuring charges - Americas	—			(285		)	—			(285		)
Restructuring charges - EMEA	(1,007		)	(1,491		)	(2,199		)	(2,324		)
Inventory adjustment relating to exit activities - Asia	—			—			(526		)	—
Restructuring charges - Asia	(114		)	—			(661		)	—
Total operating earnings ⁽²⁾	$	63,357		$	64,364		$	127,536		$	134,336

(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.

Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Basis of Presentation (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Mar. 31, 2018
Revenue from External Customer [Line Items]
Revenue	$ 660,462	$ 617,289	$ 1,331,392	$ 1,239,914
Typical payment terms			30 days
Current contract liability	9,518		$ 9,518		$ 9,387
Noncurrent contract liability	7,009		7,009		7,094
Unbilled contracts receivable	22,805		22,805		$ 24,810
Revenue recognized	661		2,597
Right of return asset related to value of inventory	2,647		2,647
Refund liability	5,013		5,013
Cost of goods sold	499,582	457,041	1,004,652	916,208
Other (income) expense, net	(1,325)	2,756	(997)	6,028
ASU No. 2017-07
Revenue from External Customer [Line Items]
Cost of goods sold	(284)	(374)	(607)	(735)
Other (income) expense, net	284	$ 374	607	$ 735
Transferred over Time
Revenue from External Customer [Line Items]
Revenue	16,491		34,895
Service Revenue
Revenue from External Customer [Line Items]
Revenue	$ 37,105		$ 69,200

Basis of Presentation - Remaining Performance Obligation (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Accounting Policies [Abstract]
Remaining performance obligation	$ 75,420
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 33,076
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected timing of satisfaction	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 33,944
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 4,655
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 3,723
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 22
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, expected timing of satisfaction	1 year

Inventories - (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 100,318	$ 92,216
Work-in-process	113,554	136,068
Finished goods	182,532	185,950
Total	$ 396,404	$ 414,234

Fair Value of Financial Instruments - Financial Assets and (Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ (4,153)	$ (3,855)
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(4,153)	(3,855)
Lead forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(4,032)	(3,877)
Lead forward contracts \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(4,032)	(3,877)
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(121)	22
Foreign currency forward contracts \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ (121)	$ 22

Fair Value of Financial Instruments - (Additional Information) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of trades, percentage	100.00%	102.00%
5.00% Senior Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	5.00%
Long-term debt	$ 300,000

Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	$ 0	$ 22
Notes	300,000	300,000
Derivative liability	4,153	3,877
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	0	22
Notes	300,000	304,500
Derivative liability	$ 4,153	$ 3,877

- Derivative Financial Instruments (Additional Information) (Details) $ in Thousands, lb in Millions	6 Months Ended
	Sep. 30, 2018 USD ($) lb	Mar. 31, 2018 USD ($) lb
Cost of Sales
Derivatives, Fair Value [Line Items]
Foreign currency cash flow hedge loss to be reclassified during next 12 months	$ 11,114
Lead forward contracts
Derivatives, Fair Value [Line Items]
Notional amount in pounds \| lb	68.9	62.9
Fair value of hedges, net	$ 67,543	$ 72,207
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	54,742	54,164
Foreign currency forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional amount	$ 31,128	$ 28,486
Maximum \| Lead forward contracts
Derivatives, Fair Value [Line Items]
Derivative, remaining maturity	1 year

Derivative Financial Instruments - Location and Amounts of Derivative Fair Values (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018
Derivatives and Hedging Activities Designated as Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	$ 0	$ 209
Derivatives liabilities, fair value	4,103	3,877
Derivatives and Hedging Activities Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	0	0
Derivatives liabilities, fair value	50	187
Foreign currency forward contracts \| Derivatives and Hedging Activities Designated as Cash Flow Hedges \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	0	209
Foreign currency forward contracts \| Derivatives and Hedging Activities Designated as Cash Flow Hedges \| Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	71	0
Foreign currency forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	0	0
Foreign currency forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments \| Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	50	187
Lead forward contracts \| Derivatives and Hedging Activities Designated as Cash Flow Hedges \| Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	4,032	3,877
Lead forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments \| Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	$ 0	$ 0

Derivative Financial Instruments - Derivatives Designated as Cash Flow Hedges (Details) - Derivatives Designated as Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (11,386)	$ 2,867	$ (10,289)	$ (6)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(3,308)	(2,959)	(3,522)	(992)
Lead forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(11,524)	3,896	(11,009)	3,082
Lead forward contracts \| Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(3,742)	(1,892)	(2,719)	(89)
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	138	(1,029)	720	(3,088)
Foreign currency forward contracts \| Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 434	$ (1,067)	$ (803)	$ (903)

Derivative Financial Instruments - Derivatives Not Designated as Hedging Instruments (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ 96	$ (36)	$ (622)	$ 12
Foreign currency forward contracts \| Other Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ 96	$ (36)	$ (622)	$ 12

- (Additional Information) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
- (Additional Information) (Details) - USD ($)	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Mar. 31, 2019	Mar. 31, 2018
Income Tax Contingency [Line Items]
Increase in effective tax rate due to GILTI inclusion	2.80%
Decrease in effective tax rate due to FDII guidance	(0.50%)
Effective income tax rates	18.60%	21.70%	19.10%	21.20%
Net decrease in effective tax rate due to Tax Act	2.20%
Decrease in effective tax rate due to change in enacted tax rate	(4.50%)
Foreign income as a percentage or worldwide income						$ 0.63
Foreign effective income tax rates			11.10%	11.20%
Tax rate of Swiss subsidiary			6.00%
Scenario, Forecast
Income Tax Contingency [Line Items]
Blended federal statutory tax rate					21.00%
Foreign income as a percentage or worldwide income					$ 0.68

Warranty - Analysis of Changes in the Liability (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Product Warranties Disclosures [Abstract]
Balance at beginning of period	$ 49,689	$ 46,677	$ 50,602	$ 46,116
Current period provisions	6,181	3,717	11,017	6,808
Costs incurred	(7,920)	(3,841)	(12,301)	(7,037)
Foreign currency translation adjustment	(217)	560	(1,585)	1,226
Balance at end of period	$ 47,733	$ 47,113	$ 47,733	$ 47,113

Commitments, Contingencies and Litigation - (Additional Information) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		12 Months Ended
	Jul. 31, 2017	Jun. 30, 2017	Feb. 29, 2016	Sep. 30, 2018	Jul. 01, 2018	Mar. 31, 2018
Commitments, Contingencies And Litigation [Line Items]
Reserves for anti-competition investigations				$ 928		$ 2,326
Provision for environmental liabilities					$ 1,082	1,109
Belgium Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations			$ 1,962	1,272
Reserves for anti-competition investigations				928		2,326
Germany Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations		$ 14,811
Reserves for anti-competition investigations				0		0
Estimate of possible loss				11,415
Dutch Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations	$ 11,229
Reserves for anti-competition investigations				$ 0		$ 0

Restructuring Plans - (Additional Information) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($) Employee	Oct. 01, 2017 USD ($)	Sep. 30, 2018 USD ($)	Oct. 01, 2017 USD ($)	Mar. 31, 2018 USD ($) Employee	Mar. 31, 2017 USD ($) Employee
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities			$ 1,073	$ 210
Restructuring and other exit (credits)	$ 1,121	$ 1,776	2,860	$ 2,609
Restructuring costs incurred			2,243
Restructuring reserve	2,835		2,835		$ 2,909
EMEA \| Restructurings Related to Improving Efficiency Related to Motive Power Assembly and Distribution Center
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities						$ 4,700
Expected reduction in number of employees \| Employee						45
Restructuring and other exit (credits)					1,610	$ 3,104
Restructuring costs incurred			1,021		2,403	$ 749
Restructuring reserve	675		675
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities					$ 7,700
Expected reduction in number of employees \| Employee					75
Restructuring and other exit (credits)			2,176
Restructuring costs incurred			879		$ 1,350
Restructuring reserve	2,159		2,159
Expected additional restructuring charges	3,100		3,100
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					69
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations \| Cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					2,260
EMEA \| Restructurings Related to Improving Efficiencies of Reserve Power Operations in EMEA
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities			200
Restructuring and other exit (credits)			23
Restructuring costs incurred			22
Restructuring reserve	1		1
Americas \| Restructurings Related to Improving Efficiencies of General Operations in the Americas
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities	$ 960
Expected reduction in number of employees \| Employee	60
Restructuring and other exit (credits)					960
Restructuring costs incurred			207		$ 755
Asia \| Restructuring Related to Improving Profitability in India
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities			547
Restructuring and other exit (credits)			114
Cost of Sales \| Asia \| Restructuring Related to Improving Profitability in India \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)			$ 526

Restructuring Plans - Roll-forward of Restructuring Reserve (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 2,909
Accrued	2,313
Costs incurred	(2,243)
Foreign currency impact	(144)
Restructuring reserve, ending balance	2,835
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	2,893
Accrued	2,174
Costs incurred	(2,091)
Foreign currency impact	(143)
Restructuring reserve, ending balance	2,833
Other
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	16
Accrued	139
Costs incurred	(152)
Foreign currency impact	(1)
Restructuring reserve, ending balance	$ 2

Debt - Long-term Debt Including Capital Lease Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Mar. 31, 2018	Apr. 23, 2015
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 605,000	$ 585,500
Unamortized Issuance Costs	5,338	5,965
Long-term debt, net of unamortized issuance costs	599,662	579,535
5.00% Senior Notes, due 2023
Debt Instrument [Line Items]
Long-term debt	300,000	300,000	$ 300,000
Unamortized Issuance Costs	2,809	3,122
Secured Debt \| Incremental Commitment Agreement \| 2017 Credit Facility, due 2022
Debt Instrument [Line Items]
Incremental term loan commitment	305,000	285,500
Unamortized Issuance Costs	$ 2,529	$ 2,843

Debt - (Additional Information) (Details) - USD ($)		3 Months Ended		6 Months Ended
Debt - (Additional Information) (Details) - USD ($)	Aug. 04, 2017	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Mar. 31, 2018	Aug. 03, 2017	Apr. 23, 2015
Debt Instrument [Line Items]
Increase in borrowing capacity limit	$ 325,000,000
Company owned capital stock, percentage securing senior secured credit facility	65.00%
Short-term debt		$ 14,071,000		$ 14,071,000		$ 18,341,000
Short-term debt, weighted average interest rate		4.00%		4.00%		7.00%
Amortization expense relating to debt issuance costs and included in interest expense		$ 314,000	$ 327,000	$ 627,000	$ 674,000
Deferred issuance costs, net of accumulated amortization		5,338,000		5,338,000		$ 5,965,000
5.00% Senior Notes, due 2023
Debt Instrument [Line Items]
Interest rate								5.00%
Long-term debt		300,000,000		300,000,000		300,000,000		$ 300,000,000
Standby Letters of Credit
Debt Instrument [Line Items]
Available lines of credit		531,132,000		531,132,000		613,234,000
Stand by letters of credit		3,422,000		3,422,000		3,074,000
Outstanding amount		87,857,000		87,857,000		$ 150,459,000
2017 Credit Facility, due 2022 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000
Available lines of credit		155,000,000		155,000,000
2017 Credit Facility, due 2022 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, face amount	150,000,000
Available lines of credit		150,000,000		150,000,000
Current portion of long-term debt		$ 7,500,000		$ 7,500,000
2011 Credit Facility, due 2018 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 500,000
Available lines of credit	240,000,000
2011 Credit Facility, due 2018 \| Secured Debt
Debt Instrument [Line Items]
Debt instrument, face amount							$ 150,000
Available lines of credit	$ 123,750,000
LIBOR \| 2017 Revolver And 2017 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
LIBOR \| 2017 Revolver And 2017 Term Loan \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
LIBOR \| 2017 Revolver And 2017 Term Loan \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Federal Funds Effective Rate \| 2017 Revolver And 2017 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Eurocurrency Base Rate \| 2017 Revolver And 2017 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Debt Instrument Quarterly Installments Beginning December 31, 2018 Through December 30, 2019
Debt Instrument [Line Items]
Debt instrument, periodic payment	$ 1,875,000
Debt Instrument Quarterly Installments Beginning December 31, 2019 Through December 30, 2020
Debt Instrument [Line Items]
Debt instrument, periodic payment	2,813,000
Debt Instrument Quarterly Installments Beginning December 31, 2020 Through September 29, 2022
Debt Instrument [Line Items]
Debt instrument, periodic payment	3,750,000
Debt Instrument Final Installments Payable On September 30, 2022
Debt Instrument [Line Items]
Debt instrument, periodic payment	$ 105,000,000

Retirement Plans -Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	157	167	316	334
Expected return on plan assets	(135)	(120)	(257)	(240)
Amortization and deferral	36	80	92	159
Net periodic benefit cost	58	127	151	253
International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	252	256	507	499
Interest cost	457	444	927	876
Expected return on plan assets	(535)	(557)	(1,087)	(1,105)
Amortization and deferral	304	360	616	711
Net periodic benefit cost	$ 478	$ 503	$ 963	$ 981

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	4,173,554		4,173,554
Equity-based compensation expense	$ 4,788	$ 4,293	$ 9,129	$ 9,523
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and restricted stock units (in shares)			147,977,000
Stock option grants outstanding (in shares)	700,513,000		700,513,000
Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding (in shares)	607,652,000		607,652,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding (in shares)	45,975,000		45,975,000
Market Condition-Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and restricted stock units (in shares)			3,507,000
Stock option grants outstanding (in shares)	353,623,000		353,623,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised (in shares)			130,638,000
Non-employee Directors \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			32,567,000
Management and Other Key Employees \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			180,132,000
Management and Other Key Employees \| Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-qualified stock option grants during period (in shares)			192,700,000
Management and Other Key Employees \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			45,883,000
Management and Other Key Employees \| Market Condition-Based Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			36,646,000

Stockholders' Equity and Noncontrolling Interests - Change in the Number of Shares of Common Stock Outstanding (Details) - shares	6 Months Ended
	Sep. 30, 2018	Mar. 31, 2018
Common Stock Outstanding Roll Forward
Shares outstanding, beginning balance (in shares)	41,915,000
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes (in shares)	233,391
Shares outstanding, ending balance (in shares)	42,148,391
Treasury stock (in shares)	12,680,105	12,680,105

Stockholders' Equity and Noncontrolling Interests - Components of Accumulated Other Comprehensive Income (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	$ 1,201,111
Ending balance	1,202,802
Pension funded status adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	22,503
Before Reclassifications	0
Amounts Reclassified from AOCI	(600)
Ending balance	21,903
Net unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(3,425)
Before Reclassifications	7,869
Amounts Reclassified from AOCI	2,695
Ending balance	(8,599)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(15,789)
Before Reclassifications	85,591
Amounts Reclassified from AOCI	0
Ending balance	(101,380)
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(41,717)
Before Reclassifications	(93,460)
Amounts Reclassified from AOCI	3,295
Ending balance	$ (131,882)

Stockholders' Equity and Noncontrolling Interests - Reclassifications from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net loss on cash flow hedging derivative instruments	$ (499,582)	$ (457,041)	$ (1,004,652)	$ (916,208)
Derivatives in cash flow hedging relationships
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense (benefit)	(777)	(1,095)	(827)	(367)
Net of tax	2,531	1,864	2,695	625
Derivatives in cash flow hedging relationships \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net loss on cash flow hedging derivative instruments	3,308	2,959	3,522	992
Defined benefit pension costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs and deferrals	340	440	708	870
Tax expense (benefit)	(40)	(102)	(108)	(205)
Net of tax	$ 300	$ 338	$ 600	$ 665

Stockholders' Equity and Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 1,201,111
Net earnings attributable to EnerSys stockholders	$ 47,424	$ 43,222	93,284	$ 91,423
Net earnings (losses) attributable to noncontrolling interests	23	(71)	183	50
Net earnings	47,447	43,151	93,467	91,473
Net unrealized loss on derivative instruments, net of tax			(5,174)
Pension funded status adjustment, net of tax	300	338	600	665
Foreign currency translation adjustment			(86,313)
Total other comprehensive (loss) gain, net of tax	(20,029)	32,138	(90,887)	74,129
Total comprehensive income	27,418	$ 75,289	2,580	165,602
Dividends paid to stockholders			(14,747)	$ (14,967)
Other, including activity related to equity awards			13,858
Ending balance	$ 1,202,802		$ 1,202,802
Dividends declared (in dollars per share)	$ 0.175	$ 0.175	$ 0.35	$ 0.35
Equity Attributable to EnerSys Stockholders
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 1,195,675
Net earnings attributable to EnerSys stockholders			93,284
Net unrealized loss on derivative instruments, net of tax			(5,174)
Pension funded status adjustment, net of tax			600
Foreign currency translation adjustment			(85,591)
Total other comprehensive (loss) gain, net of tax			(90,165)
Total comprehensive income			3,119
Dividends paid to stockholders			(14,747)
Other, including activity related to equity awards			13,858
Ending balance	$ 1,197,905		1,197,905
Nonredeemable Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			5,436
Net earnings (losses) attributable to noncontrolling interests			183
Net unrealized loss on derivative instruments, net of tax			0
Pension funded status adjustment, net of tax			0
Foreign currency translation adjustment			(722)
Total other comprehensive (loss) gain, net of tax			(722)
Total comprehensive income			(539)
Dividends paid to stockholders			0
Other, including activity related to equity awards			0
Ending balance	$ 4,897		$ 4,897

Earnings Per Share - Reconciliation from Basic to Diluted Average Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 47,424	$ 43,222	$ 93,284	$ 91,423
Basic weighted-average number of common shares outstanding (in shares)	42,133,484	42,938,131	42,073,015	43,194,107
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	640,222	389,230	600,829	551,111
Diluted weighted-average number of common shares outstanding (in shares)	42,773,706	43,327,361	42,673,844	43,745,218
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.13	$ 1.01	$ 2.22	$ 2.12
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.11	$ 1.00	$ 2.19	$ 2.09
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	409,425	283,674	286,755	257,243

- 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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+ 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

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+ Details

- Definition

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

+ References + Details

Business Segments - (Details) $ in Thousands	3 Months Ended		6 Months Ended
Business Segments - (Details) $ in Thousands	Sep. 30, 2018 USD ($)	Oct. 01, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Oct. 01, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			3
Net sales	$ 660,462	$ 617,289	$ 1,331,392	$ 1,239,914
Intersegment sales	50,982	52,720	96,541	93,907
Operating earnings by segment	63,357	64,364	127,536	134,336
Restructuring charges	(1,121)	(1,776)	(2,860)	(2,609)
Reserve power
Segment Reporting Information [Line Items]
Net sales	313,338	292,238	637,356	597,415
Motive power
Segment Reporting Information [Line Items]
Net sales	347,124	325,051	694,036	642,499
Total net sales
Segment Reporting Information [Line Items]
Net sales	660,462	617,289	1,331,392	1,239,914
Americas
Segment Reporting Information [Line Items]
Net sales	388,574	341,504	781,148	696,107
Intersegment sales	7,888	8,979	13,746	16,216
Operating earnings by segment	48,306	44,156	96,042	97,943
Restructuring charges	0	(285)	0	(285)
EMEA
Segment Reporting Information [Line Items]
Net sales	203,997	197,856	414,491	396,933
Intersegment sales	35,039	38,563	67,126	67,380
Operating earnings by segment	13,829	17,802	31,032	31,576
Restructuring charges	(1,007)	(1,491)	(2,199)	(2,324)
Asia
Segment Reporting Information [Line Items]
Net sales	67,891	77,929	135,753	146,874
Intersegment sales	8,055	5,178	15,669	10,311
Operating earnings by segment	2,343	4,182	3,848	7,426
Restructuring charges	(114)	0	(661)	0
Non-cash charges \| Asia
Segment Reporting Information [Line Items]
Restructuring charges	$ 0	$ 0	$ (526)	$ 0

Subsequent Events - (Details) - Subsequent Event - USD ($) $ / shares in Units, $ in Millions	Dec. 28, 2018	Nov. 07, 2018	Oct. 29, 2018
Subsequent Event [Line Items]
Common stock dividends (in dollars per share)		$ 0.175
Scenario, Forecast \| Alpha
Subsequent Event [Line Items]
Total purchase consideration	$ 750
Portion of purchase consideration payable in cash	650
Portion of purchase consideration payable in Company's shares	$ 100
Minimum
Subsequent Event [Line Items]
Business Combination, Estimated Closing Period			30 days
Maximum
Subsequent Event [Line Items]
Business Combination, Estimated Closing Period			60 days