EnerSys (ENS) 10-Q 8 Aug 18 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Jul. 01, 2018	Aug. 03, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 1, 2018
Document Fiscal Year Focus	2,019
Document Fiscal Period Focus	Q1
Trading Symbol	ENS
Entity Registrant Name	EnerSys
Entity Central Index Key	1,289,308
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		42,121,859

Consolidated Condensed Balance

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Jul. 01, 2018	Mar. 31, 2018
Current assets:
Cash and cash equivalents	$ 512,463	$ 522,118
Accounts receivable, net of allowance for doubtful accounts: July 1, 2018 - $12,064; March 31, 2018 - $12,643	518,362	546,325
Total	394,191	414,234
Prepaid and other current assets	86,029	56,910
Total current assets	1,511,045	1,539,587
Property, plant, and equipment, net	391,665	390,260
Goodwill	340,976	352,805
Other intangible assets, net	143,335	147,141
Deferred taxes	43,664	44,402
Other assets	12,615	12,730
Total assets	2,443,300	2,486,925
Current liabilities:
Short-term debt	19,936	18,341
Accounts payable	239,921	258,982
Accrued expenses	194,177	214,207
Total current liabilities	454,034	491,530
Long-term Debt, Excluding Current Maturities	589,348	579,535
Deferred taxes	35,193	33,607
Other liabilities	188,290	181,142
Total liabilities	1,266,865	1,285,814
Commitments and contingencies
Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at July 1, 2018 and at March 31, 2018	0	0
Common Stock, $0.01 par value per share, 135,000,000 shares authorized; 54,801,964 shares issued and 42,121,859 shares outstanding at July 1, 2018; 54,595,105 shares issued and 41,915,000 shares outstanding at March 31, 2018	548	546
Additional paid-in capital	484,960	477,288
Treasury stock, at cost, 12,680,105 shares held as of July 1, 2018 and as of March 31, 2018	(560,991)	(560,991)
Retained earnings	1,358,897	1,320,549
Accumulated other comprehensive income	(112,076)	(41,717)
Total EnerSys stockholders' equity	1,171,338	1,195,675
Noncontrolling interests	5,097	5,436
Total equity	1,176,435	1,201,111
Total liabilities and equity	$ 2,443,300	$ 2,486,925

Consolidated Condensed Balance3

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 01, 2018	Mar. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 12,064	$ 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)	54,801,964	54,595,105
Common stock, shares outstanding (in shares)	42,121,859	41,915,000
Treasury stock (in shares)	12,680,105	12,680,105

Consolidated Condensed Statemen

Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Income Statement [Abstract]
Net sales	$ 670,930	$ 622,625
Cost of goods sold	505,070	459,167
Inventory adjustment relating to exit activities	526	0
Gross profit	165,334	163,458
Operating expenses	99,416	92,653
Restructuring and other exit charges	1,739	833
Operating earnings	64,179	69,972
Interest expense	6,516	5,734
Other (income) expense, net	328	3,272
Earnings before income taxes	57,335	60,966
Income tax expense	11,315	12,644
Net earnings	$ 46,020	48,322
Net earnings attributable to noncontrolling interests		121
Net earnings attributable to EnerSys stockholders		$ 48,201
Net earnings per common share attributable to EnerSys stockholders:
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.09	$ 1.11
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	1.08	1.09
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175
Weighted average shares of common stock outstanding:
Basic weighted-average number of common shares outstanding (in shares)	42,012,546	43,450,082
Diluted weighted-average number of common shares outstanding (in shares)	42,573,981	44,163,074

Consolidated Condensed Stateme5

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 46,020	$ 48,322
Other comprehensive (loss) income:
Net unrealized gain (loss) on derivative instruments, net of tax	1,005	(3,053)
Pension funded status adjustment, net of tax	300	327
Foreign currency translation adjustment	(72,163)	44,717
Total other comprehensive (loss) gain, net of tax	(70,858)	41,991
Total comprehensive (loss) income	(24,838)	90,313
Comprehensive (loss) income attributable to noncontrolling interests	(339)	87
Comprehensive (loss) income attributable to EnerSys stockholders	$ (24,499)	$ 90,226

Consolidated Condensed Stateme6

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Cash flows from operating activities
Net earnings	$ 46,020	$ 48,322
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	13,696	13,199
Write-off of assets relating to exit activities	1,073	0
Derivatives not designated in hedging relationships:
Net losses (gains)	718	(48)
Cash settlements	(699)	(313)
Provision for doubtful accounts	254	545
Deferred income taxes	(195)	(243)
Non-cash interest expense	313	347
Stock-based compensation	4,341	5,230
(Gain) loss on disposal of property, plant, and equipment	(5)	3
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	3,284	(3,891)
Inventories	(20,345)	(18,280)
Prepaid and other current assets	488	(4,160)
Other assets	(334)	(500)
Accounts payable	(9,577)	(3,352)
Accrued expenses	(13,476)	(15,171)
Other liabilities	20	(69)
Net cash provided by operating activities	25,576	21,619
Cash flows from investing activities
Capital expenditures	(15,539)	(13,102)
Purchase of businesses	0	(2,964)
Proceeds from disposal of property, plant, and equipment	12	64
Net cash used in investing activities	(15,527)	(16,002)
Cash flows from financing activities
Net borrowings on short-term debt	2,953	6,729
Repayments of 2011 Term Loan	0	(3,750)
Option proceeds	6,797	575
Payment of taxes related to net share settlement of equity awards	(3,453)	(7,367)
Purchase of treasury stock	0	(21,191)
Dividends paid to stockholders	(7,371)	(7,595)
Other	54	(17)
Net cash provided by financing activities	8,480	17,384
Effect of exchange rate changes on cash and cash equivalents	(28,184)	19,709
Net (decrease) increase in cash and cash equivalents	(9,655)	42,710
Cash and cash equivalents at beginning of period	522,118	500,329
Cash and cash equivalents at end of period	512,463	543,039
2017 Credit Facility, due 2022
Cash flows from financing activities
Proceeds from 2011 Revolver borrowings	64,000	0
Repayments of 2011 Revolver borrowings	(54,500)	0
2011 Credit Facility, due 2018
Cash flows from financing activities
Proceeds from 2011 Revolver borrowings	0	112,050
Repayments of 2011 Revolver borrowings	$ 0	$ (62,050)

Basis of Presentation

Basis of Presentation	3 Months Ended
	Jul. 01, 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 ended July 1, 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. In July 2015, the FASB voted to delay the effective date for interim and annual reporting periods beginning after December 15, 2017, with early adoption permissible one year earlier. The standard permits the use of either modified retrospective or full retrospective transition methods. 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 we also apply 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 first quarter of fiscal 2019 amounted to $35,482 . 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 first quarter of fiscal 2019 amounted to $18,404 . On July 1, 2018, the aggregate transaction price allocated to unsatisfied (or partially unsatisfied) performance obligations was approximately $65,885 , of which, the Company estimates that approximately $45,945 will be recognized as revenue in fiscal 2019, $19,072 in fiscal 2020, $734 in fiscal 2021, $112 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 July 1, 2018, the current and non-current portion of contract liabilities were $9,526 and $6,815 , respectively. As of March 31, 2018, the current and non-current portion of contract liabilities were $9,387 and $7,094 , respectively. The movement in the balances between March 31, 2018 and July 1, 2018 was not significant. Amounts representing work completed and not billed to customers represent contract assets and were $28,920 and $24,810 as of July 1, 2018 and March 31, 2018, 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 July 1, 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 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 $323 and $361 from “Cost of goods sold” relating to the first quarter of fiscal 2019 and 2018, respectively, to “Other (income) expense, net” in the Condensed Consolidated Statements of Income. Accounting Pronouncements Issued But Not Adopted as of July 1, 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. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements. 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.

Inventories

Inventories	3 Months Ended
	Jul. 01, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories, net consist of: July 1, 2018 March 31, 2018 Raw materials $ 93,767 $ 92,216 Work-in-process 115,976 136,068 Finished goods 184,448 185,950 Total $ 394,191 $ 414,234

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Jul. 01, 2018
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	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 July 1, 2018 and March 31, 2018 , and the basis for that measurement: Total Fair Value Measurement July 1, 2018 Quoted Price in Significant Significant Lead forward contracts $ (102 ) $ — $ (102 ) $ — Foreign currency forward contracts 230 — 230 — Total derivatives $ 128 $ — $ 128 $ — 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 these Notes represent the trading values based upon quoted market prices and are classified as Level 2. The Notes were trading at approximately 99% and 102% of face value on July 1, 2018 and March 31, 2018 , respectively. The carrying amounts and estimated fair values of the Company’s derivatives and Notes at July 1, 2018 and March 31, 2018 were as follows: July 1, 2018 March 31, 2018 Carrying Fair Value Carrying Fair Value Financial assets: Derivatives (1) $ 230 $ 230 $ 22 $ 22 Financial liabilities: Notes (2) $ 300,000 $ 297,000 $ 300,000 $ 304,500 Derivatives (1) 102 102 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 July 1, 2018 and March 31, 2018 ). (2) The fair value amount of the Notes at July 1, 2018 and March 31, 2018

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Jul. 01, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	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 July 1, 2018 and March 31, 2018 , the Company has hedged the price to purchase approximately 58.8 million pounds and 62.9 million pounds of lead, respectively, for a total purchase price of $64,320 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 July 1, 2018 and March 31, 2018 , the Company had entered into a total of $57,383 and $54,164 , respectively, of such contracts. In the coming twelve months, the Company anticipates that $3,038 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 July 1, 2018 and March 31, 2018 , the notional amount of these contracts was $27,258 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 July 1, 2018 and March 31, 2018 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments July 1, 2018 March 31, 2018 July 1, 2018 March 31, 2018 Prepaid and other current assets Foreign currency forward contracts $ 436 $ 209 $ — $ — Total assets $ 436 $ 209 $ — $ — Accrued expenses Lead forward contracts $ 102 $ 3,877 $ — $ — Foreign currency forward contracts — — 206 187 Total liabilities $ 102 $ 3,877 $ 206 $ 187 The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended July 1, 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 $ 515 Cost of goods sold $ 1,023 Foreign currency forward contracts 582 Cost of goods sold (1,237 ) Total $ 1,097 $ (214 ) 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 $ (718 ) Total $ (718 ) The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended July 2, 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 $ (814 ) Cost of goods sold $ 1,803 Foreign currency forward contracts (2,059 ) Cost of goods sold 164 Total $ (2,873 ) $ 1,967 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 $ 48 Total $ 48

Income Taxes

Income Taxes	3 Months Ended
	Jul. 01, 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 first 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 July 1, 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 E&P 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 first 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 2.7% . 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 first quarter of fiscal 2019 and 2018 were 19.7% and 20.7% , respectively. The rate decrease in the first quarter of fiscal 2019 compared to the first quarter 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 2.6% comprised of a 4.8% decrease for the rate change, a 0.5% decrease for the FDII deduction and a 2.7% increase for GILTI inclusion. Foreign income as a percentage of worldwide income is estimated to be 66% for fiscal 2019 compared to 69% for fiscal 2018 . The foreign effective income tax rates for the first quarter of fiscal 2019 and 2018 were 11.8% and 11.6% , respectively. The rate increase 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

Warranty	3 Months Ended
	Jul. 01, 2018
Product Warranties Disclosures [Abstract]
Warranty	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 July 1, 2018 July 2, 2017 Balance at beginning of period $ 50,602 $ 46,116 Current period provisions 4,836 3,091 Costs incurred (4,381 ) (3,196 ) Foreign currency translation adjustment (1,368 ) 666 Balance at end of period $ 49,689 $ 46,677

Commitments, Contingencies and

Commitments, Contingencies and Litigation	3 Months Ended
	Jul. 01, 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 July 1, 2018 and March 31, 2018 , the Company had a reserve balance of $933 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 July 1, 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 July 1, 2018 and March 31, 2018 , the Company had a reserve balance of $0 relating to the Dutch regulatory proceeding. As of July 1, 2018 and March 31, 2018 , the Company had a total reserve balance of $933 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 $1,109 as of July 1, 2018 and March 31, 2018 . 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

Restructuring Plans

Restructuring Plans	3 Months Ended
	Jul. 01, 2018
Restructuring and Related Activities [Abstract]
Restructuring Plans	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 first quarter of fiscal 2019 , the Company incurred $491 against the accrual. As of July 1, 2018 , the reserve balance associated with these actions is $1,211 . 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 $7,000 , 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 70 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 first quarter of fiscal 2019 , the Company recorded restructuring charges of $1,169 and incurred $309 in costs against the accrual. As of July 1, 2018 , the reserve balance associated with these actions is $1,727 . The Company expects to be committed to an additional $3,500 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. The Company estimates that the total charges for these actions will amount to approximately $1,000 , 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 first quarter of fiscal 2019 , the Company incurred $95 in costs against the accrual. As of July 1, 2018 , the reserve balance associated with this action is $112 . The Company expects to complete this action in fiscal 2019. 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 first quarter of fiscal 2019, the Company recorded restructuring charges of $23 and incurred $11 in costs against the accrual. As of July 1, 2018, the reserve balance associated with this action is $11 . The Company expects to complete this action in fiscal 2019. 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 1,160 32 1,192 Costs incurred (863 ) (43 ) (906 ) Foreign currency impact (134 ) — (134 ) Balance as of July 1, 2018 $ 3,056 $ 5 $ 3,061 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, the Company recorded a non-cash write off of reserve power inventories of $526 , which was reported in cost of goods sold. In addition, the Company recorded a $547

Debt

Debt	3 Months Ended
	Jul. 01, 2018
Debt Disclosure [Abstract]
Debt	Debt The following summarizes the Company’s long-term debt as of July 1, 2018 and March 31, 2018 : July 1, 2018 March 31, 2018 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs 5.00% Senior Notes due 2023 $ 300,000 $ 2,965 $ 300,000 $ 3,122 2017 Credit Facility, due 2022 295,000 2,687 285,500 2,843 $ 595,000 $ 5,652 $ 585,500 $ 5,965 Less: Unamortized issuance costs 5,652 5,965 Long-term debt, net of unamortized issuance costs $ 589,348 $ 579,535 5.00% Senior Notes The Company's $300,000 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 July 1, 2018 , the Company had $145,000 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 $3,750 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 July 1, 2018 and March 31, 2018 , the Company had $19,936 and $18,341 , respectively, of short-term borrowings. The weighted average interest rate on these borrowings was approximately 3% and 7% at July 1, 2018 and March 31, 2018 , respectively. Letters of Credit As of July 1, 2018 and March 31, 2018 , the Company had $3,074 of standby letters of credit. Debt Issuance Costs Amortization expense, relating to debt issuance costs, included in interest expense was $313 and $347 , respectively, for the quarters ended July 1, 2018 and July 2, 2017 . Debt issuance costs, net of accumulated amortization, totaled $5,652 and $ 5,965 , respectively, at July 1, 2018 and March 31, 2018 . Available Lines of Credit As of July 1, 2018 and March 31, 2018 , the Company had available and undrawn, under all its lines of credit, $540,241 and $613,234 , respectively, including $86,966 and $150,459 , respectively, of uncommitted lines of credit as of July 1, 2018 and March 31, 2018

Retirement Plans

Retirement Plans	3 Months Ended
	Jul. 01, 2018
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The following tables present the components of the Company’s net periodic benefit cost related to its defined benefit pension plans: United States Plans International Plans Quarter ended Quarter ended July 1, 2018 July 2, 2017 July 1, 2018 July 2, 2017 Service cost $ — $ — $ 255 $ 243 Interest cost 159 167 470 432 Expected return on plan assets (122 ) (120 ) (552 ) (548 ) Amortization and deferral 56 79 312 351 Net periodic benefit cost $ 93 $ 126 $ 485 $ 478

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Jul. 01, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of July 1, 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 share units and other forms of equity-based compensation. The Company recognized stock-based compensation expense associated with its equity incentive plans of $4,341 for the first quarter of fiscal 2019 and $5,230 for the first quarter of fiscal 2018 . The Company recognizes compensation expense using the straight-line method over the vesting period of the awards. During the first quarter of fiscal 2019 , the Company granted to non-employee directors 2,502 restricted stock units, pursuant to the 2017 EIP. Common stock activity during the first quarter of fiscal 2019 included the vesting of 146,521 restricted stock units and 1,588 market condition-based share units and the exercise of 105,259 stock options. As of July 1, 2018 , there were 440,331 non-qualified stock options, 490,485 restricted stock units and 318,377

Stockholders' Equity and Noncon

Stockholders' Equity and Noncontrolling Interests	3 Months Ended
	Jul. 01, 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 first quarter ended July 1, 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 206,859 Shares outstanding as of July 1, 2018 42,121,859 Treasury Stock At July 1, 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 July 1, 2018 and March 31, 2018 , are as follows: March 31, 2018 Before Reclassifications Amounts Reclassified from AOCI July 1, 2018 Pension funded status adjustment $ (22,503 ) $ — $ 300 $ (22,203 ) Net unrealized gain (loss) on derivative instruments (3,425 ) 841 164 (2,420 ) Foreign currency translation adjustment (15,789 ) (71,664 ) — (87,453 ) Accumulated other comprehensive (loss) income $ (41,717 ) $ (70,823 ) $ 464 $ (112,076 ) The following table presents reclassifications from AOCI during the first quarter ended July 1, 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 $ 214 Cost of goods sold Tax benefit (50 ) Net loss on derivative instruments, net of tax $ 164 Defined benefit pension costs: Prior service costs and deferrals $ 368 Net periodic benefit cost, included in cost of goods sold and other (income) expense, net - See Note 1 and 10 Tax benefit (68 ) Net periodic benefit cost, net of tax $ 300 The following table presents reclassifications from AOCI during the first quarter ended July 2, 2017 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in cash flow hedging relationships: Net gain on cash flow hedging derivative instruments $ (1,967 ) Cost of goods sold Tax expense 728 Net gain on derivative instruments, net of tax $ (1,239 ) Defined benefit pension costs: Prior service costs and deferrals $ 430 Net periodic benefit cost, included in cost of goods sold and other (income) expense, net - See Note 1 and 10 Tax benefit (103 ) Net periodic benefit cost, net of tax $ 327 The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the first quarter ended July 1, 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 45,860 160 46,020 Net unrealized gain on derivative instruments, net of tax 1,005 — 1,005 Pension funded status adjustment, net of tax 300 — 300 Foreign currency translation adjustment (71,664 ) (499 ) (72,163 ) Total other comprehensive loss, net of tax (70,359 ) (499 ) (70,858 ) Total comprehensive loss (24,499 ) (339 ) (24,838 ) Other changes in equity: Cash dividends - common stock ($0.175 per share) (7,371 ) — (7,371 ) Other, including activity related to equity awards 7,533 — 7,533 Balance as of July 1, 2018 $ 1,171,338 $ 5,097 $ 1,176,435

Earnings Per Share

Earnings Per Share	3 Months Ended
	Jul. 01, 2018
Earnings Per Share [Abstract]
Earnings Per Share	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 July 1, 2018 July 2, 2017 Net earnings attributable to EnerSys stockholders $ 45,860 $ 48,201 Weighted-average number of common shares outstanding: Basic 42,012,546 43,450,082 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 561,435 712,992 Diluted weighted-average number of common shares outstanding 42,573,981 44,163,074 Basic earnings per common share attributable to EnerSys stockholders $ 1.09 $ 1.11 Diluted earnings per common share attributable to EnerSys stockholders $ 1.08 $ 1.09 Anti-dilutive equity awards not included in diluted weighted-average common shares 164,085 230,811

Business Segments

Business Segments	3 Months Ended
	Jul. 01, 2018
Segment Reporting [Abstract]
Business Segments	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 first quarter ended July 1, 2018 and July 2, 2017 is shown below: Quarter ended July 1, 2018 July 2, 2017 Net sales by segment to unaffiliated customers Americas $ 392,574 $ 354,603 EMEA 210,494 199,077 Asia 67,862 68,945 Total net sales $ 670,930 $ 622,625 Net sales by product line Reserve power $ 324,018 $ 305,177 Motive power 346,912 317,448 Total net sales $ 670,930 $ 622,625 Intersegment sales Americas $ 5,858 $ 7,237 EMEA 32,087 28,817 Asia 7,614 5,133 Total intersegment sales (1) $ 45,559 $ 41,187 Operating earnings by segment Americas $ 47,736 $ 53,788 EMEA 17,203 13,773 Asia 1,505 3,244 Restructuring charges - EMEA (1,192 ) (833 ) Inventory adjustment relating to exit activities - Asia (526 ) — Fixed asset write-off relating to exit activities - Asia (547 ) — Total operating earnings (2) $ 64,179 $ 69,972 (1 ) Intersegment sales are presented on a cost-plus basis, which takes into consideration the effect of transfer prices between legal entities. (2 )

Subsequent Events

Subsequent Events	3 Months Ended
	Jul. 01, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On August 8, 2018, the Board of Directors approved a quarterly cash dividend of $0.175 per share of common stock to be paid on

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Jul. 01, 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 ended July 1, 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.
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. In July 2015, the FASB voted to delay the effective date for interim and annual reporting periods beginning after December 15, 2017, with early adoption permissible one year earlier. The standard permits the use of either modified retrospective or full retrospective transition methods. 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 we also apply 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 first quarter of fiscal 2019 amounted to $35,482 . 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 first quarter of fiscal 2019 amounted to $18,404 . On July 1, 2018, the aggregate transaction price allocated to unsatisfied (or partially unsatisfied) performance obligations was approximately $65,885 , of which, the Company estimates that approximately $45,945 will be recognized as revenue in fiscal 2019, $19,072 in fiscal 2020, $734 in fiscal 2021, $112 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 July 1, 2018, the current and non-current portion of contract liabilities were $9,526 and $6,815 , respectively. As of March 31, 2018, the current and non-current portion of contract liabilities were $9,387 and $7,094 , respectively. The movement in the balances between March 31, 2018 and July 1, 2018 was not significant. Amounts representing work completed and not billed to customers represent contract assets and were $28,920 and $24,810 as of July 1, 2018 and March 31, 2018, 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 July 1, 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 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 $323 and $361 from “Cost of goods sold” relating to the first quarter of fiscal 2019 and 2018, respectively, to “Other (income) expense, net” in the Condensed Consolidated Statements of Income. Accounting Pronouncements Issued But Not Adopted as of July 1, 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. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements. 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.

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Jul. 01, 2018
Inventory Disclosure [Abstract]
Summary Of Inventories	Inventories, net consist of: July 1, 2018 March 31, 2018 Raw materials $ 93,767 $ 92,216 Work-in-process 115,976 136,068 Finished goods 184,448 185,950 Total $ 394,191 $ 414,234

Fair Value of Financial Instr24

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Jul. 01, 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 July 1, 2018 and March 31, 2018 , and the basis for that measurement: Total Fair Value Measurement July 1, 2018 Quoted Price in Significant Significant Lead forward contracts $ (102 ) $ — $ (102 ) $ — Foreign currency forward contracts 230 — 230 — Total derivatives $ 128 $ — $ 128 $ — 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 July 1, 2018 and March 31, 2018 were as follows: July 1, 2018 March 31, 2018 Carrying Fair Value Carrying Fair Value Financial assets: Derivatives (1) $ 230 $ 230 $ 22 $ 22 Financial liabilities: Notes (2) $ 300,000 $ 297,000 $ 300,000 $ 304,500 Derivatives (1) 102 102 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 July 1, 2018 and March 31, 2018 ). (2) The fair value amount of the Notes at July 1, 2018 and March 31, 2018 represent the trading value of the instruments.

Derivative Financial Instrume25

Derivative Financial Instruments (Tables)	3 Months Ended
	Jul. 01, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	Presented below in tabular form is information on the location and amounts of derivative fair values in the Consolidated Condensed Balance Sheets and derivative gains and losses in the Consolidated Condensed Statements of Income: Fair Value of Derivative Instruments July 1, 2018 and March 31, 2018 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments July 1, 2018 March 31, 2018 July 1, 2018 March 31, 2018 Prepaid and other current assets Foreign currency forward contracts $ 436 $ 209 $ — $ — Total assets $ 436 $ 209 $ — $ — Accrued expenses Lead forward contracts $ 102 $ 3,877 $ — $ — Foreign currency forward contracts — — 206 187 Total liabilities $ 102 $ 3,877 $ 206 $ 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 July 1, 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 $ 515 Cost of goods sold $ 1,023 Foreign currency forward contracts 582 Cost of goods sold (1,237 ) Total $ 1,097 $ (214 ) 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 $ (718 ) Total $ (718 ) The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended July 2, 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 $ (814 ) Cost of goods sold $ 1,803 Foreign currency forward contracts (2,059 ) Cost of goods sold 164 Total $ (2,873 ) $ 1,967 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 $ 48 Total $ 48

Warranty (Tables)

Warranty (Tables)	3 Months Ended
	Jul. 01, 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 July 1, 2018 July 2, 2017 Balance at beginning of period $ 50,602 $ 46,116 Current period provisions 4,836 3,091 Costs incurred (4,381 ) (3,196 ) Foreign currency translation adjustment (1,368 ) 666 Balance at end of period $ 49,689 $ 46,677

Restructuring Plans (Tables)

Restructuring Plans (Tables)	3 Months Ended
	Jul. 01, 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 1,160 32 1,192 Costs incurred (863 ) (43 ) (906 ) Foreign currency impact (134 ) — (134 ) Balance as of July 1, 2018 $ 3,056 $ 5 $ 3,061

Debt (Tables)

Debt (Tables)	3 Months Ended
	Jul. 01, 2018
Debt Disclosure [Abstract]
Long-Term Debt And Capital Lease Obligations	The following summarizes the Company’s long-term debt as of July 1, 2018 and March 31, 2018 : July 1, 2018 March 31, 2018 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs 5.00% Senior Notes due 2023 $ 300,000 $ 2,965 $ 300,000 $ 3,122 2017 Credit Facility, due 2022 295,000 2,687 285,500 2,843 $ 595,000 $ 5,652 $ 585,500 $ 5,965 Less: Unamortized issuance costs 5,652 5,965 Long-term debt, net of unamortized issuance costs $ 589,348 $ 579,535

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Jul. 01, 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 July 1, 2018 July 2, 2017 July 1, 2018 July 2, 2017 Service cost $ — $ — $ 255 $ 243 Interest cost 159 167 470 432 Expected return on plan assets (122 ) (120 ) (552 ) (548 ) Amortization and deferral 56 79 312 351 Net periodic benefit cost $ 93 $ 126 $ 485 $ 478

Stockholders' Equity and Nonc30

Stockholders' Equity and Noncontrolling Interests (Tables)	3 Months Ended
	Jul. 01, 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 first quarter ended July 1, 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 206,859 Shares outstanding as of July 1, 2018 42,121,859
Components Of Accumulated Other Comprehensive Income	The components of AOCI, net of tax, as of July 1, 2018 and March 31, 2018 , are as follows: March 31, 2018 Before Reclassifications Amounts Reclassified from AOCI July 1, 2018 Pension funded status adjustment $ (22,503 ) $ — $ 300 $ (22,203 ) Net unrealized gain (loss) on derivative instruments (3,425 ) 841 164 (2,420 ) Foreign currency translation adjustment (15,789 ) (71,664 ) — (87,453 ) Accumulated other comprehensive (loss) income $ (41,717 ) $ (70,823 ) $ 464 $ (112,076 )
Reclassification from Accumulated Other Comprehensive Income	The following table presents reclassifications from AOCI during the first quarter ended July 1, 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 $ 214 Cost of goods sold Tax benefit (50 ) Net loss on derivative instruments, net of tax $ 164 Defined benefit pension costs: Prior service costs and deferrals $ 368 Net periodic benefit cost, included in cost of goods sold and other (income) expense, net - See Note 1 and 10 Tax benefit (68 ) Net periodic benefit cost, net of tax $ 300 The following table presents reclassifications from AOCI during the first quarter ended July 2, 2017 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in cash flow hedging relationships: Net gain on cash flow hedging derivative instruments $ (1,967 ) Cost of goods sold Tax expense 728 Net gain on derivative instruments, net of tax $ (1,239 ) Defined benefit pension costs: Prior service costs and deferrals $ 430 Net periodic benefit cost, included in cost of goods sold and other (income) expense, net - See Note 1 and 10 Tax benefit (103 ) Net periodic benefit cost, net of tax $ 327
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 first quarter ended July 1, 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 45,860 160 46,020 Net unrealized gain on derivative instruments, net of tax 1,005 — 1,005 Pension funded status adjustment, net of tax 300 — 300 Foreign currency translation adjustment (71,664 ) (499 ) (72,163 ) Total other comprehensive loss, net of tax (70,359 ) (499 ) (70,858 ) Total comprehensive loss (24,499 ) (339 ) (24,838 ) Other changes in equity: Cash dividends - common stock ($0.175 per share) (7,371 ) — (7,371 ) Other, including activity related to equity awards 7,533 — 7,533 Balance as of July 1, 2018 $ 1,171,338 $ 5,097 $ 1,176,435

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Jul. 01, 2018
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	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 July 1, 2018 July 2, 2017 Net earnings attributable to EnerSys stockholders $ 45,860 $ 48,201 Weighted-average number of common shares outstanding: Basic 42,012,546 43,450,082 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 561,435 712,992 Diluted weighted-average number of common shares outstanding 42,573,981 44,163,074 Basic earnings per common share attributable to EnerSys stockholders $ 1.09 $ 1.11 Diluted earnings per common share attributable to EnerSys stockholders $ 1.08 $ 1.09 Anti-dilutive equity awards not included in diluted weighted-average common shares 164,085 230,811

Business Segments Business Segm

Business Segments Business Segments (Tables)	3 Months Ended
	Jul. 01, 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 first quarter ended July 1, 2018 and July 2, 2017 is shown below: Quarter ended July 1, 2018 July 2, 2017 Net sales by segment to unaffiliated customers Americas $ 392,574 $ 354,603 EMEA 210,494 199,077 Asia 67,862 68,945 Total net sales $ 670,930 $ 622,625 Net sales by product line Reserve power $ 324,018 $ 305,177 Motive power 346,912 317,448 Total net sales $ 670,930 $ 622,625 Intersegment sales Americas $ 5,858 $ 7,237 EMEA 32,087 28,817 Asia 7,614 5,133 Total intersegment sales (1) $ 45,559 $ 41,187 Operating earnings by segment Americas $ 47,736 $ 53,788 EMEA 17,203 13,773 Asia 1,505 3,244 Restructuring charges - EMEA (1,192 ) (833 ) Inventory adjustment relating to exit activities - Asia (526 ) — Fixed asset write-off relating to exit activities - Asia (547 ) — Total operating earnings (2) $ 64,179 $ 69,972 (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)

Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Mar. 31, 2018
Revenue from External Customer [Line Items]
Revenue	$ 670,930	$ 622,625
Typical payment terms	30 days
Current contract liability	$ 9,526		$ 9,387
Noncurrent contract liability	6,815		7,094
Unbilled contracts receivable	28,920		$ 24,810
Right of return asset related to value of inventory	2,647
Refund liability	5,013
Cost of goods sold	505,070	459,167
Other (income) expense, net	328	3,272
ASU No. 2017-07
Revenue from External Customer [Line Items]
Cost of goods sold	(323)	(361)
Other (income) expense, net	323	$ 361
Transferred over Time
Revenue from External Customer [Line Items]
Revenue	18,404
Service Revenue
Revenue from External Customer [Line Items]
Revenue	$ 35,482

Basis of Presentation - Remaini

Basis of Presentation - Remaining Performance Obligation (Details) $ in Thousands	Jul. 01, 2018USD ($)
Accounting Policies [Abstract]
Remaining performance obligation	$ 65,885
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 45,945
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]: 2019-04-01
Accounting Policies [Abstract]
Remaining performance obligation	$ 19,072
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	$ 734
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	$ 112
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)

Inventories - (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Mar. 31, 2018
Inventory Disclosure [Abstract]
Raw materials	$ 93,767	$ 92,216
Work-in-process	115,976	136,068
Finished goods	184,448	185,950
Total	$ 394,191	$ 414,234

Fair Value of Financial Instr36

Fair Value of Financial Instruments - Financial Assets and (Liabilities) (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ 128	$ (3,855)
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	128	(3,855)
Lead forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(102)	(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	(102)	(3,877)
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	230	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	$ 230	$ 22

Fair Value of Financial Instr37

Fair Value of Financial Instruments - (Additional Information) (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Mar. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of trades, percentage	99.00%	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 Instr38

Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Mar. 31, 2018
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	$ 230	$ 22
Notes	300,000	300,000
Derivative liability	102	3,877
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	230	22
Notes	297,000	304,500
Derivative liability	$ 102	$ 3,877

- Derivative Financial Instrume

- Derivative Financial Instruments (Additional Information) (Details) $ in Thousands, lb in Millions	3 Months Ended
	Jul. 01, 2018USD ($)lb	Mar. 31, 2018USD ($)lb
Cost of Sales
Derivatives, Fair Value [Line Items]
Foreign currency cash flow hedge loss to be reclassified during next 12 months	$ 3,038
Lead forward contracts
Derivatives, Fair Value [Line Items]
Notional amount in pounds | lb	58.8	62.9
Fair value of hedges, net	$ 64,320	$ 72,207
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	57,383	54,164
Foreign currency forward contracts | Derivatives and Hedging Activities Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional amount	$ 27,258	$ 28,486
Maximum | Lead forward contracts
Derivatives, Fair Value [Line Items]
Derivative, remaining maturity	1 year

Derivative Financial Instrume40

Derivative Financial Instruments - Location and Amounts of Derivative Fair Values (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Mar. 31, 2018
Derivatives and Hedging Activities Designated as Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	$ 436	$ 209
Derivatives liabilities, fair value	102	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	206	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	436	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	0	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	206	187
Lead forward contracts | Derivatives and Hedging Activities Designated as Cash Flow Hedges | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	102	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 Instrume41

Derivative Financial Instruments - Derivatives Designated as Cash Flow Hedges (Details) - Derivatives Designated as Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 1,097	$ (2,873)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(214)	1,967
Lead forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	515	(814)
Lead forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	1,023	1,803
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	582	(2,059)
Foreign currency forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (1,237)	$ 164

Derivative Financial Instrume42

Derivative Financial Instruments - Derivatives Not Designated as Hedging Instruments (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ (718)	$ 48
Foreign currency forward contracts | Other Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ (718)	$ 48

- (Additional Information) (Det

- (Additional Information) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jul. 01, 2018	Jul. 02, 2017	Mar. 31, 2019
Income Tax Contingency [Line Items]
Increase in effective tax rate due to GILTI inclusion	2.70%
Decrease in effective tax rate due to FDII guidance	(0.50%)
Effective income tax rates	19.70%	20.70%
Net decrease in effective tax rate due to Tax Act	(2.60%)
Decrease in effective tax rate due to change in enacted tax rate	(4.80%)
Foreign income as a percentage or worldwide income	$ 0.66	$ 0.69
Foreign effective income tax rates	11.80%	11.60%
Tax rate of Swiss subsidiary	6.00%
Scenario, Forecast
Income Tax Contingency [Line Items]
Blended federal statutory tax rate			21.00%

Warranty - Analysis of Changes

Warranty - Analysis of Changes in the Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Product Warranties Disclosures [Abstract]
Balance at beginning of period	$ 50,602	$ 46,116
Current period provisions	4,836	3,091
Costs incurred	(4,381)	(3,196)
Foreign currency translation adjustment	(1,368)	666
Balance at end of period	$ 49,689	$ 46,677

Commitments, Contingencies an45

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	Jul. 01, 2018	Mar. 31, 2018
Commitments, Contingencies And Litigation [Line Items]
Reserves for anti-competition investigations				$ 933	$ 2,326
Provision for environmental liabilities				1,109	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				933	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 - (Addition

Restructuring Plans - (Additional Information) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Jul. 01, 2018USD ($)Employee	Jul. 02, 2017USD ($)	Mar. 31, 2018USD ($)Employee	Mar. 31, 2017USD ($)
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities	$ 1,073	$ 0
Restructuring and other exit (credits)	1,739	$ 833
Restructuring costs incurred	906
Restructuring reserve	3,061		$ 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	491		2,403	$ 749
Restructuring reserve	1,211
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	$ 7,000
Expected reduction in number of employees | Employee	70
Restructuring and other exit (credits)	$ 1,169
Restructuring costs incurred	309		1,350
Restructuring reserve	1,727
Expected additional restructuring charges	3,500
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	11
Restructuring reserve	11
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	$ 1,000
Expected reduction in number of employees | Employee	60
Restructuring and other exit (credits)			960
Restructuring costs incurred	$ 95		$ 755
Restructuring reserve	112
Asia | Restructuring Related to Improving Profitability in India
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)	547
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-forw

Restructuring Plans - Roll-forward of Restructuring Reserve (Details) $ in Thousands	3 Months Ended
	Jul. 01, 2018USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 2,909
Accrued	1,192
Costs incurred	(906)
Foreign currency impact	(134)
Restructuring reserve, ending balance	3,061
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	2,893
Accrued	1,160
Costs incurred	(863)
Foreign currency impact	(134)
Restructuring reserve, ending balance	3,056
Other
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	16
Accrued	32
Costs incurred	(43)
Foreign currency impact	0
Restructuring reserve, ending balance	$ 5

Debt - Long-term Debt Including

Debt - Long-term Debt Including Capital Lease Obligations (Details) - USD ($) $ in Thousands	Jul. 01, 2018	Mar. 31, 2018	Apr. 23, 2015
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 595,000	$ 585,500
Unamortized Issuance Costs	5,652	5,965
Long-term debt, net of unamortized issuance costs	589,348	579,535
5.00% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt	300,000	300,000	$ 300,000
Unamortized Issuance Costs	2,965	3,122
Secured Debt | Incremental Commitment Agreement | 2017 Credit Facility, due 2022
Debt Instrument [Line Items]
Incremental term loan commitment	295,000	285,500
Unamortized Issuance Costs	$ 2,687	$ 2,843

Debt - (Additional Information)

Debt - (Additional Information) (Details) - USD ($)	Aug. 04, 2017	Jul. 01, 2018	Jul. 02, 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		$ 19,936,000		$ 18,341,000
Short-term debt, weighted average interest rate		3.00%		7.00%
Amortization expense relating to debt issuance costs and included in interest expense		$ 313,000	$ 347,000
Deferred issuance costs, net of accumulated amortization		5,652,000		$ 5,965,000
5.00% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt		300,000,000		300,000,000		$ 300,000,000
Interest rate						5.00%
Standby Letters of Credit
Debt Instrument [Line Items]
Available lines of credit		540,241,000		613,234,000
Stand by letters of credit		3,074,000		3,074,000
Outstanding amount		86,966,000		$ 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		145,000,000
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
Current portion of long-term debt		$ 3,750,000
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

Retirement Plans -Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	159	167
Expected return on plan assets	(122)	(120)
Amortization and deferral	56	79
Net periodic benefit cost	93	126
International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	255	243
Interest cost	470	432
Expected return on plan assets	(552)	(548)
Amortization and deferral	312	351
Net periodic benefit cost	$ 485	$ 478

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	4,173,554
Equity-based compensation expense	$ 4,341	$ 5,230
Stock options exercised (in shares)	105,259,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and restricted stock units (in shares)	146,521,000
Stock option grants outstanding (in shares)	490,485,000
Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding (in shares)	440,331,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and restricted stock units (in shares)	1,588,000
Stock option grants outstanding (in shares)	318,377,000
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)	2,502,000

Stockholders' Equity and Nonc52

Stockholders' Equity and Noncontrolling Interests - Change in the Number of Shares of Common Stock Outstanding (Details)	3 Months Ended
	Jul. 01, 2018shares
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)	206,859
Shares outstanding, ending balance (in shares)	42,121,859

Stockholders' Equity and Nonc53

Stockholders' Equity and Noncontrolling Interests - Components of Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Jul. 01, 2018USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	$ 1,201,111
Ending balance	1,176,435
Pension funded status adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	22,503
Before Reclassifications	0
Amounts Reclassified from AOCI	(300)
Ending balance	22,203
Net unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(3,425)
Before Reclassifications	(841)
Amounts Reclassified from AOCI	164
Ending balance	(2,420)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(15,789)
Before Reclassifications	71,664
Amounts Reclassified from AOCI	0
Ending balance	(87,453)
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(41,717)
Before Reclassifications	(70,823)
Amounts Reclassified from AOCI	464
Ending balance	$ (112,076)

Stockholders' Equity and Nonc54

Stockholders' Equity and Noncontrolling Interests - Reclassifications from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net loss on cash flow hedging derivative instruments	$ (505,070)	$ (459,167)
Derivatives in cash flow hedging relationships
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense (benefit)	(50)	728
Net of tax	164	(1,239)
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	214	(1,967)
Defined benefit pension costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs and deferrals	368	430
Tax expense (benefit)	(68)	(103)
Net of tax	$ 300	$ 327

Stockholders' Equity and Nonc55

Stockholders' Equity and Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 5,436
Net earnings attributable to EnerSys stockholders		$ 48,201
Net earnings attributable to noncontrolling interests		121
Net earnings	46,020	48,322
Pension funded status adjustment, net of tax	300	327
Total other comprehensive (loss) gain, net of tax	(70,858)	41,991
Total comprehensive income	(24,838)	90,313
Dividends paid to stockholders	(7,371)	(7,595)
Other, including activity related to equity awards	6,797	$ 575
Ending balance	$ 5,097
Dividends declared (in dollars per share)	$ 0.175	$ 0.175
Equity Attributable to EnerSys Stockholders
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,195,675
Net earnings attributable to EnerSys stockholders	45,860
Net unrealized gain on derivative instruments, net of tax	1,005
Pension funded status adjustment, net of tax	300
Foreign currency translation adjustment	(71,664)
Total other comprehensive (loss) gain, net of tax	(70,359)
Total comprehensive income	(24,499)
Dividends paid to stockholders	(7,371)
Other, including activity related to equity awards	7,533
Ending balance	1,171,338
Nonredeemable Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	5,436
Net earnings attributable to noncontrolling interests	160
Net unrealized gain on derivative instruments, net of tax	0
Pension funded status adjustment, net of tax	0
Foreign currency translation adjustment	(499)
Total other comprehensive (loss) gain, net of tax	(499)
Total comprehensive income	(339)
Dividends paid to stockholders	0
Other, including activity related to equity awards	0
Ending balance	5,097
Total Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,201,111
Net earnings	46,020
Net unrealized gain on derivative instruments, net of tax	1,005
Pension funded status adjustment, net of tax	300
Foreign currency translation adjustment	(72,163)
Total other comprehensive (loss) gain, net of tax	(70,858)
Total comprehensive income	(24,838)
Dividends paid to stockholders	(7,371)
Other, including activity related to equity awards	7,533
Ending balance	$ 1,176,435

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation from Basic to Diluted Average Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 01, 2018	Jul. 02, 2017
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders		$ 48,201
Basic weighted-average number of common shares outstanding (in shares)	42,012,546	43,450,082
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	561,435	712,992
Diluted weighted-average number of common shares outstanding (in shares)	42,573,981	44,163,074
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.09	$ 1.11
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.08	$ 1.09
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	164,085	230,811

Business Segments - (Details)

Business Segments - (Details) $ in Thousands	3 Months Ended
	Jul. 01, 2018USD ($)segment	Jul. 02, 2017USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Net sales	$ 670,930	$ 622,625
Intersegment sales	45,559	41,187
Operating earnings by segment	64,179	69,972
Restructuring charges	(1,739)	(833)
Reserve power
Segment Reporting Information [Line Items]
Net sales	324,018	305,177
Motive power
Segment Reporting Information [Line Items]
Net sales	346,912	317,448
Total net sales
Segment Reporting Information [Line Items]
Net sales	670,930	622,625
Americas
Segment Reporting Information [Line Items]
Net sales	392,574	354,603
Intersegment sales	5,858	7,237
Operating earnings by segment	47,736	53,788
EMEA
Segment Reporting Information [Line Items]
Net sales	210,494	199,077
Intersegment sales	32,087	28,817
Operating earnings by segment	17,203	13,773
Restructuring charges	(1,192)	(833)
Asia
Segment Reporting Information [Line Items]
Net sales	67,862	68,945
Intersegment sales	7,614	5,133
Operating earnings by segment	1,505	3,244
Restructuring charges	(547)	0
Non-cash charges | Asia
Segment Reporting Information [Line Items]
Restructuring charges	$ (526)	$ 0

Subsequent Events - (Details)

Subsequent Events - (Details)	Aug. 08, 2018$ / shares
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends (in dollars per share)	$ 0.175