EnerSys (ENS) 10-Q 9 Aug 17 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Jul. 02, 2017	Aug. 04, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 2, 2017
Document Fiscal Year Focus	2,018
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		43,401,255

Consolidated Condensed Balance

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Jul. 02, 2017	Mar. 31, 2017
Current assets:
Cash and cash equivalents	$ 543,039	$ 500,329
Accounts receivable, net of allowance for doubtful accounts: July 2, 2017 - $12,953; March 31, 2017 - $12,662	502,159	486,646
Total	383,365	360,694
Prepaid and other current assets	77,842	71,246
Total current assets	1,506,405	1,418,915
Property, plant, and equipment, net	356,297	348,549
Goodwill	340,894	328,657
Other intangible assets, net	152,879	153,960
Deferred taxes	34,864	31,587
Other assets	11,515	11,361
Total assets	2,402,854	2,293,029
Current liabilities:
Short-term debt	25,049	18,359
Accounts payable	223,580	222,493
Accrued expenses	218,435	226,579
Total current liabilities	467,064	467,431
Long-term Debt, Excluding Current Maturities	634,206	587,609
Deferred taxes	45,736	45,923
Other liabilities	88,054	83,697
Total liabilities	1,235,060	1,184,660
Commitments and contingencies
Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at July 2, 2017 and at March 31, 2017	0	0
Common Stock, $0.01 par value per share, 135,000,000 shares authorized; 54,585,646 shares issued and 43,401,255 shares outstanding at July 2, 2017; 54,370,810 shares issued and 43,447,536 shares outstanding at March 31, 2017	546	544
Additional paid-in capital	462,295	464,092
Treasury stock, at cost, 11,184,391 shares held as of July 2, 2017; 10,923,274 shares held as of March 31, 2017	(460,991)	(439,800)
Retained earnings	1,271,743	1,231,444
Accumulated other comprehensive income	(110,799)	(152,824)
Total EnerSys stockholders' equity	1,162,794	1,103,456
Noncontrolling interests	5,000	4,913
Total equity	1,167,794	1,108,369
Total liabilities and equity	$ 2,402,854	$ 2,293,029

Consolidated Condensed Balance3

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jul. 02, 2017	Mar. 31, 2017
Accounts receivable, allowance for doubtful accounts	$ 12,953	$ 12,662
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, par value	$ 0.01	$ 0.01
Common Stock, shares authorized	135,000,000	135,000,000
Common Stock, shares issued	54,585,646	54,370,810
Common stock, shares outstanding	43,401,255	43,447,536
Treasury stock, shares	11,184,391	10,923,274

Consolidated Condensed Statemen

Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Income Statement [Abstract]
Net sales	$ 622,625	$ 600,603
Cost of goods sold	459,528	434,269
Gross profit	163,097	166,334
Operating expenses	92,653	99,005
Restructuring charges	833	1,297
Gain on sale of facility	3	(59)
Operating earnings	69,611	66,032
Interest expense	5,734	5,661
Other (income) expense, net	2,911	1,333
Earnings before income taxes	60,966	59,038
Income tax expense	12,644	14,419
Net earnings	48,322	44,619
Net earnings attributable to noncontrolling interests	121	46
Net earnings attributable to EnerSys stockholders	$ 48,201	$ 44,573
Net earnings per common share attributable to EnerSys stockholders:
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.11	$ 1.03
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	1.09	1.02
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175
Weighted average shares of common stock outstanding:
Basic	43,450,082	43,269,942
Diluted	44,163,074	43,829,813

Consolidated Condensed Stateme5

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 48,322	$ 44,619
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments, net of tax	(3,053)	670
Pension funded status adjustment, net of tax	327	281
Foreign currency translation adjustments	44,717	(23,340)
Total other comprehensive gain (loss), net of tax	41,991	(22,389)
Total comprehensive income	90,313	22,230
Comprehensive loss attributable to noncontrolling interests	87	(209)
Comprehensive income attributable to EnerSys stockholders	$ 90,226	$ 22,439

Consolidated Condensed Stateme6

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Cash flows from operating activities
Net earnings	$ 48,322	$ 44,619
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	13,199	13,768
Write-off of assets relating to restructuring charges	0	718
Non-cash write-off of property, plant and equipment	0	6,300
Derivatives not designated in hedging relationships:
Net (gains) losses	(48)	302
Cash settlements	(313)	(352)
Provision for doubtful accounts	545	921
Deferred income taxes	(243)	(204)
Non-cash interest expense	347	347
Stock-based compensation	5,230	5,067
Gain on sale of facility	3	(59)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	(3,891)	29,038
Inventories	(18,280)	(22,116)
Prepaid and other current assets	(4,160)	(2,889)
Other assets	(500)	510
Accounts payable	(3,352)	(4,431)
Accrued expenses	(15,171)	(5,286)
Other liabilities	(69)	1,304
Net cash provided by operating activities	21,619	67,557
Cash flows from investing activities
Capital expenditures	(13,102)	(7,487)
Purchase of businesses	(2,964)	(12,392)
Proceeds from disposal of property, plant, and equipment	64	82
Net cash used in investing activities	(16,002)	(19,797)
Cash flows from financing activities
Net increase (decrease) in short-term debt	6,729	(9,499)
Proceeds from revolving credit borrowings	112,050	84,300
Repayments of revolving credit borrowings	(62,050)	(79,300)
Repayments of long-term debt	(3,750)	(3,750)
Option proceeds	575	5
Payment of taxes related to net share settlement of equity awards	(7,367)	(7,644)
Purchase of treasury stock	(21,191)	0
Dividends paid to stockholders	(7,595)	(7,600)
Other	(17)	(29)
Net cash provided by (used in) financing activities	17,384	(23,517)
Effect of exchange rate changes on cash and cash equivalents	19,709	(7,991)
Net increase in cash and cash equivalents	42,710	16,252
Cash and cash equivalents at beginning of period	500,329	397,307
Cash and cash equivalents at end of period	$ 543,039	$ 413,559

Basis of Presentation

Basis of Presentation	3 Months Ended
	Jul. 02, 2017
Text Block [Abstract]
Basis of Presentation	Basis of Presentation The accompanying interim unaudited consolidated condensed financial statements of EnerSys (the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all the information and notes required for complete financial statements. In the opinion of management, the unaudited consolidated condensed financial statements include all normal recurring adjustments considered necessary for the fair presentation of the financial position, results of operations, and cash flows for the interim periods presented. The financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s 2017 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on May 30, 2017 (the “ 2017 Annual Report ”). 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 2018 end on July 2, 2017, October 1, 2017, December 31, 2017, and March 31, 2018, respectively. The four quarters in fiscal 2017 ended on July 3, 2016, October 2, 2016, January 1, 2017, and March 31, 2017, 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 Issued 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 will supersede 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 has developed an implementation plan, which is currently in the assessment phase. The Company has not selected a transition method and is currently evaluating the impact that adoption of the standard will have on the financial condition, results of operations and cash flows. In February 2016, the FASB issued ASU 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 reporting 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 October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other than Inventory. ASU 2016-16 requires that an entity recognize the income tax consequences of an intra-entity transfer of assets other than inventory when the transfer occurs. This update is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods. The Company early adopted the standard on a modified retrospective basis during the first quarter of fiscal 2018 through a cumulative-effect adjustment directly to retained earnings of $137 , as of the beginning of the period of adoption. 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. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements.

Inventories

Inventories	3 Months Ended
	Jul. 02, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories, net consist of: July 2, 2017 March 31, 2017 Raw materials $ 84,094 $ 85,604 Work-in-process 119,747 107,177 Finished goods 179,524 167,913 Total $ 383,365 $ 360,694

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 and March 31, 2017 , and the basis for that measurement: Total Fair Value Measurement July 2, 2017 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ 2,806 $ — $ 2,806 $ — Foreign currency forward contracts (1,372 ) — (1,372 ) — Total derivatives $ 1,434 $ — $ 1,434 $ — Total Fair Value Measurement March 31, 2017 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ 1,163 $ — $ 1,163 $ — Foreign currency forward contracts (313 ) — (313 ) — Total derivatives $ 850 $ — $ 850 $ — 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 2017 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, accounts receivable and accounts payable approximate carrying value due to their short maturities. The fair value of the Company’s short-term debt and borrowings under the 2011 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 103% and 101% of face value on July 2, 2017 and March 31, 2017 , respectively. The carrying amounts and estimated fair values of the Company’s derivatives and Notes at July 2, 2017 and March 31, 2017 were as follows: July 2, 2017 March 31, 2017 Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Derivatives (1) $ 2,806 $ 2,806 $ 1,163 $ 1,163 Financial liabilities: Notes (2) $ 300,000 $ 309,000 $ 300,000 $ 303,000 Derivatives (1) 1,372 1,372 313 313 (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 2, 2017 and March 31, 2017 ). (2) The fair value amount of the Notes at July 2, 2017 and March 31, 2017 represent the trading value of the instruments.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 and March 31, 2017 , the Company has hedged the price to purchase approximately 61.5 million pounds and 45.0 million pounds of lead, respectively, for a total purchase price of $61,038 and $46,550 , 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 2, 2017 and March 31, 2017 , the Company had entered into a total of $44,073 and $30,751 , respectively, of such contracts. In the coming twelve months, the Company anticipates that $1,722 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 Statement 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 2, 2017 and March 31, 2017 , the notional amount of these contracts was $13,018 and $13,560 , 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 2, 2017 and March 31, 2017 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments July 2, 2017 March 31, 2017 July 2, 2017 March 31, 2017 Prepaid and other current assets Lead forward contracts $ 2,806 $ 1,163 $ — $ — Foreign currency forward contracts $ — $ 11 $ 37 $ — Total assets $ 2,806 $ 1,174 $ 37 $ — Accrued expenses Lead forward contracts $ — $ — $ — $ — Foreign currency forward contracts 1,409 — — 324 Total liabilities $ 1,409 $ — $ — $ 324 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 Derivative (Effective Portion) Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Lead forward contracts $ (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 Derivative Pretax Gain (Loss) Foreign currency forward contracts Other (income) expense, net $ 48 Total $ 48 The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended July 3, 2016 Derivatives Designated as Cash Flow Hedges Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Lead forward contracts $ 1,813 Cost of goods sold $ 1,059 Foreign currency forward contracts 128 Cost of goods sold (180 ) Total $ 1,941 $ 879 Derivatives Not Designated as Hedging Instruments Location of Gain (Loss) Recognized in Income on Derivative Pretax Gain (Loss) Foreign currency forward contracts Other (income) expense, net $ (302 ) Total $ (302 )

Income Taxes

Income Taxes	3 Months Ended
	Jul. 02, 2017
Text Block [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 quarters of fiscal 2018 and 2017 was based on the estimated effective tax rates applicable for the full years ending March 31, 2018 and March 31, 2017 , 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 and the amount of the Company's consolidated income before taxes. The consolidated effective income tax rates were 20.7% and 24.4% , respectively, for the first quarters of fiscal 2018 and 2017 . The rate decrease in the first quarter of fiscal 2018 compared to the first quarter of fiscal 2017 is primarily due to changes in the mix of earnings among tax jurisdictions. Foreign income as a percentage of worldwide income is estimated to be 61% for fiscal 2018 compared to 55% for fiscal 2017 . The foreign effective income tax rates for the first quarter of fiscal 2018 and 2017 were 11.6% and 14.4% , respectively. The rate decrease compared to the prior year period is primarily due to changes in the mix of earnings among tax jurisdictions. Income from the Company's Swiss subsidiary comprised a substantial portion of the Company's overall foreign mix of income and is taxed at an effective income tax rate of approximately 6% .

Warranties

Warranties	3 Months Ended
	Jul. 02, 2017
Disclosure Analysis Of Changes In Liability For Product Warranties [Abstract]
Warranties	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 differ from amounts provided. An analysis of changes in the liability for product warranties is as follows: Quarter ended July 2, 2017 July 3, 2016 Balance at beginning of period $ 46,116 $ 48,422 Current period provisions 3,091 5,236 Costs incurred (3,196 ) (2,359 ) Foreign currency translation adjustment 666 (3,224 ) Balance at end of period $ 46,677 $ 48,075

Commitments, Contingencies and

Commitments, Contingencies and Litigation	3 Months Ended
	Jul. 02, 2017
Text Block [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 many 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, such 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 have 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 is responding to inquiries related to these matters. 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. As of July 2, 2017 and March 31, 2017 , the Company had a reserve balance of $1,955 and $1,830 , respectively, relating to the Belgian regulatory proceeding. The change in the reserve balance between July 2, 2017 and March 31, 2017 was solely due to foreign currency translation impact. 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 $14,393 , which was paid on July 11, 2017. As of July 2, 2017 and March 31, 2017, the Company had a reserve balance of $14,393 and 13,463 , respectively, 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, 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 $10,785 , which is payable by August 11, 2017. For the Dutch regulatory proceeding, the Company had reserved $10,785 and $10,258 , respectively, as of July 2, 2017 and March 31, 2017. As of July 2, 2017 and March 31, 2017 , the Company had a total reserve balance of $27,133 and $25,551 , respectively, in connection with these remaining 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 $1,117 and $1,123 as of July 2, 2017 and March 31, 2017 . Based on current information, the Company’s management believes this reserve is adequate to satisfy the Company’s environmental liabilities at this facility. This facility is separate from the Company’s current metal fabrication facility in Sumter. Lead and Foreign Currency Forward Contracts To stabilize its lead costs and reduce volatility from currency movements, the Company enters into contracts with financial institutions. The vast majority of such contracts are for a period not extending beyond one year. Please refer to Note 4 - Derivative Financial Instruments for more details.

Restructuring Plans

Restructuring Plans	3 Months Ended
	Jul. 02, 2017
Text Block [Abstract]
Restructuring Plans	Restructuring and Other Exit Charges During fiscal 2016, the Company announced restructurings to improve efficiencies primarily related to its motive power assembly and distribution center in Italy and its sales and administration organizations in EMEA. In addition, the Company announced a further restructuring related to its manufacturing operations in Europe. The Company estimates that the total charges for these actions will amount to approximately $6,600 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 130 employees upon completion. In fiscal 2016, the Company recorded restructuring charges of $5,232 and recorded an additional $1,251 during fiscal 2017. The Company incurred $2,993 in costs against the accrual in fiscal 2016 and incurred an additional $3,037 against the accrual during fiscal 2017. During the first quarter of fiscal 2018 , the Company recorded restructuring charges of $100 and incurred $133 against the accrual. As of July 2, 2017 , the reserve balance associated with these actions is $379 . The Company expects no further restructuring charges related to these actions and expects to complete the program during fiscal 2018. 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 $4,800 , 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 incurred $749 in costs against the accrual. During the first quarter of fiscal 2018 , the Company recorded restructuring charges of $733 and incurred $930 against the accrual. As of July 2, 2017 , the reserve balance associated with these actions is $2,218 . The Company expects to be committed to an additional $1,000 in restructuring charges related to this action in fiscal 2018, when it expects to complete this program. During the first quarter of fiscal 2017, the Company announced a restructuring primarily to complete the transfer of equipment and clean-up of its manufacturing facility located in Jiangdu, the People’s Republic of China, which stopped production during fiscal 2016. This program was completed during the first quarter of fiscal 2018. The total cash charges for these actions amounted to $779 . During fiscal 2017, the Company recorded charges of $779 and incurred $648 in costs against the accrual. During the first quarter of fiscal 2018 , the Company recorded charges of $0 and incurred $129 in costs against the accrual. A roll-forward of the restructuring reserve is as follows: Employee Severance Other Total Balance as of March 31, 2017 $ 2,668 $ 144 $ 2,812 Accrued 738 95 833 Costs incurred (1,034 ) (158 ) (1,192 ) Foreign currency impact 141 3 144 Balance as of July 2, 2017 $ 2,513 $ 84 $ 2,597

Debt

Debt	3 Months Ended
	Jul. 02, 2017
Text Block [Abstract]
Debt	Debt The following summarizes the Company’s long-term debt as of July 2, 2017 and March 31, 2017 : July 2, 2017 March 31, 2017 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs 5.00% Senior Notes due 2023 $ 300,000 $ 3,590 $ 300,000 $ 3,746 2011 Credit Facility, due 2018 338,750 954 292,500 1,145 $ 638,750 $ 4,544 $ 592,500 $ 4,891 Less: Unamortized issuance costs 4,544 4,891 Long-term debt, net of unamortized issuance costs $ 634,206 $ 587,609 5.00% Senior Notes The Company's $300,000 5.00% Senior Notes due 2023 bear interest at a rate of 5.00% per annum. Interest is payable semiannually in arrears on April 30 and October 30 of each year, commencing 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 each of its subsidiaries that are guarantors under the 2011 Credit Facility (the “Guarantors”). The Guarantees are unsecured and unsubordinated obligations of the Guarantors. 2011 Credit Facility The Company is party to a $500,000 senior secured revolving credit facility and a $150,000 senior secured incremental term loan (the “Term Loan”) that matures on September 30, 2018, comprising the “2011 Credit Facility”. The quarterly installments payable on the Term Loan were $1,875 beginning June 30, 2015 and $3,750 beginning June 30, 2016 with a final payment of $108,750 on September 30, 2018. The 2011 Credit Facility may be increased by an aggregate amount of $300,000 in revolving commitments and/or one or more new tranches of term loans, under certain conditions. Both revolver loans and the Term Loan under the 2011 Credit Facility 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 1.75% (currently 1.25% and based on the Company's consolidated net leverage ratio) or (ii) the Base Rate (which is the highest of (a) the Bank of America prime rate, and (b) the Federal Funds Effective Rate) plus between 0.25% and 0.75% (based on the Company’s consolidated net leverage ratio). Obligations under the 2011 Credit Facility are secured by substantially all of the Company’s existing and future acquired assets, including substantially all of the capital stock of the Company’s United States subsidiaries that are guarantors under the credit facility and 65% of the capital stock of certain of the Company’s foreign subsidiaries that are owned by the Company’s United States subsidiaries. The current portion of the Term Loan of $15,000 is classified as long-term debt as the Company expects to refinance the future quarterly payments with revolver borrowings under its 2011 Credit Facility. As of July 2, 2017 , the Company had $215,000 outstanding in revolver borrowings and $123,750 under its Term Loan borrowings. Short-Term Debt As of July 2, 2017 and March 31, 2017 , the Company had $25,049 and $18,359 , respectively, of short-term borrowings. The weighted-average interest rate on these borrowings was approximately 6% and 7% at July 2, 2017 and March 31, 2017 , respectively. Letters of Credit As of July 2, 2017 and March 31, 2017 , the Company had $3,383 and $2,189 , respectively, of standby letters of credit. Debt Issuance Costs Amortization expense, relating to debt issuance costs, included in interest expense was $347 , for the quarters ended July 2, 2017 and July 3, 2016 . Debt issuance costs, net of accumulated amortization, totaled $4,544 and $ 4,891 , respectively, at July 2, 2017 and March 31, 2017 . Available Lines of Credit As of July 2, 2017 and March 31, 2017 , the Company had available and undrawn, under all its lines of credit, $421,725 and $475,947 , respectively, including $138,650 and $142,872 , respectively, of uncommitted lines of credit as of July 2, 2017 and March 31, 2017 .

Retirement Plans

Retirement Plans	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 July 3, 2016 July 2, 2017 July 3, 2016 Service cost $ — $ 91 $ 243 $ 223 Interest cost 167 170 432 494 Expected return on plan assets (120 ) (204 ) (548 ) (510 ) Amortization and deferral 79 132 351 265 Net periodic benefit cost $ 126 $ 189 $ 478 $ 472

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Jul. 02, 2017
Text Block [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of July 2, 2017 , the Company maintains the Second Amended and Restated EnerSys 2010 Equity Incentive Plan, (“2010 EIP”). The 2010 EIP reserved 3,177,477 shares of common stock for the grant of various classes of nonqualified stock options, restricted stock units, market 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 $5,230 for the first quarter of fiscal 2018 and $5,067 for the first quarter of fiscal 2017 . The Company recognizes compensation expense using the straight-line method over the vesting period of the awards. During the first quarter fiscal 2018 , the Company granted to non-employee directors 1,783 restricted stock units, pursuant to the 2010 EIP. During the first quarter fiscal 2018 , the Company granted to management and other key employees 169,703 non-qualified stock options and 60,008 market condition-based share units that vest three years from the date of grant, and 160,313 restricted stock units that vest 25% each year over four years from the date of grant. Common stock activity during the first quarter fiscal 2018 included the vesting of 147,123 restricted stock units and 142,426 market condition-based share units and the exercise of 55,422 stock options. As of July 2, 2017 , there were 563,860 non-qualified stock options, 615,804 restricted stock units and 357,431 market condition-based share units outstanding.

Stockholders' Equity

Stockholders' Equity	3 Months Ended
	Jul. 02, 2017
Text Block [Abstract]
Stockholders' Equity	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 2, 2017 : Shares outstanding as of March 31, 2017 43,447,536 Purchase of treasury stock (261,117 ) Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes 214,836 Shares outstanding as of July 2, 2017 43,401,255 Treasury Stock During the first quarter ended July 2, 2017 , the Company purchased 261,117 shares for $21,191 . At July 2, 2017 and March 31, 2017 , the Company held 11,184,391 and 10,923,274 shares as treasury stock, respectively. Accumulated Other Comprehensive Income ("AOCI") The components of AOCI, net of tax, as of July 2, 2017 and March 31, 2017 , are as follows: March 31, 2017 Before Reclassifications Amounts Reclassified from AOCI July 2, 2017 Pension funded status adjustment $ (25,555 ) $ — $ 327 $ (25,228 ) Net unrealized gain (loss) on derivative instruments 1,975 (1,814 ) (1,239 ) (1,078 ) Foreign currency translation adjustment (129,244 ) 44,751 — (84,493 ) Accumulated other comprehensive loss $ (152,824 ) $ 42,937 $ (912 ) $ (110,799 ) 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 operating expenses - See Note 10 Tax benefit (103 ) Net periodic benefit cost, net of tax $ 327 The following table presents reclassifications from AOCI during the first quarter ended July 3, 2016 : 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 $ (879 ) Cost of goods sold Tax expense 324 Net gain on derivative instruments, net of tax $ (555 ) Defined benefit pension costs: Prior service costs and deferrals $ 397 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (116 ) Net periodic benefit cost, net of tax $ 281 The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the first quarter ended July 2, 2017 : Equity Attributable to EnerSys Stockholders Nonredeemable Noncontrolling Interests Total Equity Balance as of March 31, 2017 $ 1,103,456 $ 4,913 $ 1,108,369 Total comprehensive income: Net earnings 48,201 121 48,322 Net unrealized loss on derivative instruments, net of tax (3,053 ) — (3,053 ) Pension funded status adjustment, net of tax 327 — 327 Foreign currency translation adjustment 44,751 (34 ) 44,717 Total other comprehensive gain (loss), net of tax 42,025 (34 ) 41,991 Total comprehensive income 90,226 87 90,313 Other changes in equity: Purchase of treasury stock (21,191 ) (21,191 ) Cash dividends - common stock ($0.175 per share) (7,595 ) — (7,595 ) Other, including activity related to equity awards (2,102 ) — (2,102 ) Balance as of July 2, 2017 $ 1,162,794 $ 5,000 $ 1,167,794

Earnings Per Share

Earnings Per Share	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 July 3, 2016 Net earnings attributable to EnerSys stockholders $ 48,201 $ 44,573 Weighted-average number of common shares outstanding: Basic 43,450,082 43,269,942 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 712,992 559,871 Diluted weighted-average number of common shares outstanding 44,163,074 43,829,813 Basic earnings per common share attributable to EnerSys stockholders $ 1.11 $ 1.03 Diluted earnings per common share attributable to EnerSys stockholders $ 1.09 $ 1.02 Anti-dilutive equity awards not included in diluted weighted-average common shares 230,811 389,956

Business Segments

Business Segments	3 Months Ended
	Jul. 02, 2017
Disclosure Schedule Of Financial Data For Company Reportable Business Segments And Product Lines [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 2, 2017 and July 3, 2016 is shown below: Quarter ended July 2, 2017 July 3, 2016 Net sales by segment to unaffiliated customers Americas $ 354,603 $ 329,720 EMEA 199,077 197,130 Asia 68,945 73,753 Total net sales $ 622,625 $ 600,603 Net sales by product line Reserve power $ 305,177 $ 296,041 Motive power 317,448 304,562 Total net sales $ 622,625 $ 600,603 Intersegment sales Americas $ 7,237 $ 6,004 EMEA 28,817 22,163 Asia 5,133 3,697 Total intersegment sales (1) $ 41,187 $ 31,864 Operating earnings by segment Americas $ 53,661 $ 43,310 EMEA 13,539 19,836 Asia 3,244 4,183 Restructuring charges - Americas — (892 ) Restructuring charges - EMEA (833 ) (269 ) Restructuring charges - Asia — (136 ) Total operating earnings (2) $ 69,611 $ 66,032 (1 ) Intersegment sales are presented on a cost-plus basis, which takes into consideration the effect of transfer prices between legal entities. (2 ) The Company does not allocate interest expense or other (income) expense to the reportable segments.

Subsequent Events

Subsequent Events	3 Months Ended
	Jul. 02, 2017
Text Block [Abstract]
Subsequent Events	Subsequent Events On August 2, 2017, the Board of Directors approved a quarterly cash dividend of $0.175 per share of common stock to be paid on September 29, 2017, to stockholders of record as of September 15, 2017. On August 4, 2017, the Company refinanced its existing 2011 Credit Facility comprising of a $500,000 senior secured revolving credit facility and a $150,000 senior secured incremental term loan that matures on September 30, 2018, with a new facility that includes a $600,000 senior secured revolving credit facility and a $150,000 senior secured term loan, with a maturity date of September 30, 2022. On August 9, 2017, the Company also announced the establishment of a new $100,000 stock repurchase authorization, with no expiration date. This authorization is in addition to the existing stock repurchase program, established in connection with the dilutive effects of previously granted equity-based awards.

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Jul. 02, 2017
Inventory Disclosure [Abstract]
Summary Of Inventories	Inventories, net consist of: July 2, 2017 March 31, 2017 Raw materials $ 84,094 $ 85,604 Work-in-process 119,747 107,177 Finished goods 179,524 167,913 Total $ 383,365 $ 360,694

Fair Value of Financial Instr23

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 and March 31, 2017 , and the basis for that measurement: Total Fair Value Measurement July 2, 2017 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ 2,806 $ — $ 2,806 $ — Foreign currency forward contracts (1,372 ) — (1,372 ) — Total derivatives $ 1,434 $ — $ 1,434 $ — Total Fair Value Measurement March 31, 2017 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ 1,163 $ — $ 1,163 $ — Foreign currency forward contracts (313 ) — (313 ) — Total derivatives $ 850 $ — $ 850 $ —
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 2, 2017 and March 31, 2017 were as follows: July 2, 2017 March 31, 2017 Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Derivatives (1) $ 2,806 $ 2,806 $ 1,163 $ 1,163 Financial liabilities: Notes (2) $ 300,000 $ 309,000 $ 300,000 $ 303,000 Derivatives (1) 1,372 1,372 313 313 (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 2, 2017 and March 31, 2017 ). (2) The fair value amount of the Notes at July 2, 2017 and March 31, 2017 represent the trading value of the instruments.

Derivative Financial Instrume24

Derivative Financial Instruments (Tables)	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 and March 31, 2017 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments July 2, 2017 March 31, 2017 July 2, 2017 March 31, 2017 Prepaid and other current assets Lead forward contracts $ 2,806 $ 1,163 $ — $ — Foreign currency forward contracts $ — $ 11 $ 37 $ — Total assets $ 2,806 $ 1,174 $ 37 $ — Accrued expenses Lead forward contracts $ — $ — $ — $ — Foreign currency forward contracts 1,409 — — 324 Total liabilities $ 1,409 $ — $ — $ 324
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 2, 2017 Derivatives Designated as Cash Flow Hedges Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Lead forward contracts $ (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 Derivative Pretax Gain (Loss) Foreign currency forward contracts Other (income) expense, net $ 48 Total $ 48 The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended July 3, 2016 Derivatives Designated as Cash Flow Hedges Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Lead forward contracts $ 1,813 Cost of goods sold $ 1,059 Foreign currency forward contracts 128 Cost of goods sold (180 ) Total $ 1,941 $ 879 Derivatives Not Designated as Hedging Instruments Location of Gain (Loss) Recognized in Income on Derivative Pretax Gain (Loss) Foreign currency forward contracts Other (income) expense, net $ (302 ) Total $ (302 )

Warranties (Tables)

Warranties (Tables)	3 Months Ended
	Jul. 02, 2017
Disclosure Analysis Of Changes In Liability For Product Warranties [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 2, 2017 July 3, 2016 Balance at beginning of period $ 46,116 $ 48,422 Current period provisions 3,091 5,236 Costs incurred (3,196 ) (2,359 ) Foreign currency translation adjustment 666 (3,224 ) Balance at end of period $ 46,677 $ 48,075

Restructuring Plans (Tables)

Restructuring Plans (Tables)	3 Months Ended
	Jul. 02, 2017
Text Block [Abstract]
Reconciliation of Restructuring Reserve	A roll-forward of the restructuring reserve is as follows: Employee Severance Other Total Balance as of March 31, 2017 $ 2,668 $ 144 $ 2,812 Accrued 738 95 833 Costs incurred (1,034 ) (158 ) (1,192 ) Foreign currency impact 141 3 144 Balance as of July 2, 2017 $ 2,513 $ 84 $ 2,597

Debt (Tables)

Debt (Tables)	3 Months Ended
	Jul. 02, 2017
Text Block [Abstract]
Long-Term Debt And Capital Lease Obligations	The following summarizes the Company’s long-term debt as of July 2, 2017 and March 31, 2017 : July 2, 2017 March 31, 2017 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs 5.00% Senior Notes due 2023 $ 300,000 $ 3,590 $ 300,000 $ 3,746 2011 Credit Facility, due 2018 338,750 954 292,500 1,145 $ 638,750 $ 4,544 $ 592,500 $ 4,891 Less: Unamortized issuance costs 4,544 4,891 Long-term debt, net of unamortized issuance costs $ 634,206 $ 587,609

Retirement Plans (Tables)

Retirement Plans (Tables)	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 July 3, 2016 July 2, 2017 July 3, 2016 Service cost $ — $ 91 $ 243 $ 223 Interest cost 167 170 432 494 Expected return on plan assets (120 ) (204 ) (548 ) (510 ) Amortization and deferral 79 132 351 265 Net periodic benefit cost $ 126 $ 189 $ 478 $ 472

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 : Shares outstanding as of March 31, 2017 43,447,536 Purchase of treasury stock (261,117 ) Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes 214,836 Shares outstanding as of July 2, 2017 43,401,255
Components Of Accumulated Other Comprehensive Income	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 operating expenses - See Note 10 Tax benefit (103 ) Net periodic benefit cost, net of tax $ 327 The following table presents reclassifications from AOCI during the first quarter ended July 3, 2016 : 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 $ (879 ) Cost of goods sold Tax expense 324 Net gain on derivative instruments, net of tax $ (555 ) Defined benefit pension costs: Prior service costs and deferrals $ 397 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (116 ) Net periodic benefit cost, net of tax $ 281 The components of AOCI, net of tax, as of July 2, 2017 and March 31, 2017 , are as follows: March 31, 2017 Before Reclassifications Amounts Reclassified from AOCI July 2, 2017 Pension funded status adjustment $ (25,555 ) $ — $ 327 $ (25,228 ) Net unrealized gain (loss) on derivative instruments 1,975 (1,814 ) (1,239 ) (1,078 ) Foreign currency translation adjustment (129,244 ) 44,751 — (84,493 ) Accumulated other comprehensive loss $ (152,824 ) $ 42,937 $ (912 ) $ (110,799 )
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 2, 2017 : Equity Attributable to EnerSys Stockholders Nonredeemable Noncontrolling Interests Total Equity Balance as of March 31, 2017 $ 1,103,456 $ 4,913 $ 1,108,369 Total comprehensive income: Net earnings 48,201 121 48,322 Net unrealized loss on derivative instruments, net of tax (3,053 ) — (3,053 ) Pension funded status adjustment, net of tax 327 — 327 Foreign currency translation adjustment 44,751 (34 ) 44,717 Total other comprehensive gain (loss), net of tax 42,025 (34 ) 41,991 Total comprehensive income 90,226 87 90,313 Other changes in equity: Purchase of treasury stock (21,191 ) (21,191 ) Cash dividends - common stock ($0.175 per share) (7,595 ) — (7,595 ) Other, including activity related to equity awards (2,102 ) — (2,102 ) Balance as of July 2, 2017 $ 1,162,794 $ 5,000 $ 1,167,794

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Jul. 02, 2017
Text Block [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 2, 2017 July 3, 2016 Net earnings attributable to EnerSys stockholders $ 48,201 $ 44,573 Weighted-average number of common shares outstanding: Basic 43,450,082 43,269,942 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 712,992 559,871 Diluted weighted-average number of common shares outstanding 44,163,074 43,829,813 Basic earnings per common share attributable to EnerSys stockholders $ 1.11 $ 1.03 Diluted earnings per common share attributable to EnerSys stockholders $ 1.09 $ 1.02 Anti-dilutive equity awards not included in diluted weighted-average common shares 230,811 389,956

Business Segments Business Segm

Business Segments Business Segments (Tables)	3 Months Ended
	Jul. 02, 2017
Segment Reporting [Abstract]
Selected Financial Data for Reportable Business Segments and Product Lines	: Quarter ended July 2, 2017 July 3, 2016 Net sales by segment to unaffiliated customers Americas $ 354,603 $ 329,720 EMEA 199,077 197,130 Asia 68,945 73,753 Total net sales $ 622,625 $ 600,603 Net sales by product line Reserve power $ 305,177 $ 296,041 Motive power 317,448 304,562 Total net sales $ 622,625 $ 600,603 Intersegment sales Americas $ 7,237 $ 6,004 EMEA 28,817 22,163 Asia 5,133 3,697 Total intersegment sales (1) $ 41,187 $ 31,864 Operating earnings by segment Americas $ 53,661 $ 43,310 EMEA 13,539 19,836 Asia 3,244 4,183 Restructuring charges - Americas — (892 ) Restructuring charges - EMEA (833 ) (269 ) Restructuring charges - Asia — (136 ) Total operating earnings (2) $ 69,611 $ 66,032 (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 Basis of

Basis of Presentation Basis of Presentation (Details)	3 Months Ended
	Jul. 02, 2017USD ($)
Basis of Presentation [Abstract]
Excess tax benefits	$ 137

Inventories - (Details)

Inventories - (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Mar. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 84,094	$ 85,604
Work-in-process	119,747	107,177
Finished goods	179,524	167,913
Total	$ 383,365	$ 360,694

Fair Value of Financial Instr34

Fair Value of Financial Instruments - Financial Assets and (Liabilities) (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Mar. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ 1,434	$ 850
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	1,434	850
Lead hedge forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	2,806	1,163
Lead hedge forward contracts | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	2,806	1,163
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(1,372)	(313)
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	$ (1,372)	$ (313)

Fair Value of Financial Instr35

Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Mar. 31, 2017
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	$ 2,806	$ 1,163
Notes	300,000	300,000
Derivative liability	1,372	313
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	2,806	1,163
Notes	309,000	303,000
Derivative liability	$ 1,372	$ 313

Fair Value of Financial Instr36

Fair Value of Financial Instruments - (Additional Information) (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Mar. 31, 2017	Apr. 23, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Notes, Face Value Of Trade, Percentage	103.00%	101.00%
5.00% Senior Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument Interest Rate	5.00%		5.00%
Long-term debt	$ 300,000	$ 300,000	$ 300,000

Derivative Financial Instrume37

Derivative Financial Instruments - Location and Amounts of Derivative Fair Values (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Mar. 31, 2017
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	$ 2,806	$ 1,174
Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	1,409	0
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	37	0
Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	0	324
Foreign currency forward contracts | Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	0	11
Foreign currency forward contracts | Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	1,409	0
Foreign currency forward contracts | Not Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	37	0
Foreign currency forward contracts | Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	0	324
Lead hedge forward contracts | Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	2,806	1,163
Lead hedge forward contracts | Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	0	0
Lead hedge forward contracts | Not Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	0	0
Lead hedge forward contracts | Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	$ 0	$ 0

Derivative Financial Instrume38

Derivative Financial Instruments - Derivatives Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 1,967	$ 879
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(2,873)	1,941
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	1,967	879
Designated as Hedging Instrument | Lead hedge forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(814)	1,813
Designated as Hedging Instrument | Lead hedge forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	1,803	1,059
Designated as Hedging Instrument | Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(2,059)	128
Designated as Hedging Instrument | Foreign currency forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 164	$ (180)

Derivative Financial Instrume39

Derivative Financial Instruments - Derivatives Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ 48	$ (302)
Foreign currency forward contracts | Other Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ 48	$ (302)

- Derivative Financial Instrume

- Derivative Financial Instruments (Additional Information) (Details) $ in Thousands, lb in Millions	3 Months Ended
	Jul. 02, 2017USD ($)lb	Jul. 03, 2016USD ($)	Mar. 31, 2017USD ($)lb
Derivatives, Fair Value [Line Items]
Recorded expense in the consolidated condensed statements of income	$ (2,911)	$ (1,333)
Cost of Sales
Derivatives, Fair Value [Line Items]
Foreign currency cash flow hedge loss to be reclassified during next 12 months	1,722
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	44,073		$ 30,751
Foreign currency forward contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount	$ 13,018		$ 13,560
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Notional amount in pounds | lb	61.5		45
Fair Value Hedges, Net	$ 61,038		$ 46,550
Maximum | Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Derivative, remaining maturity	1 year

- (Additional Information) (Det

- (Additional Information) (Details) - USD ($)	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Disclosure Income Taxes Additional Information [Abstract]
Effective income tax rates	20.70%	24.40%
Deferred Income Tax Expense (Benefit)	$ (243,000)	$ (204,000)
Income (Loss) from Continuing Operations before Income Taxes, Foreign	$ 0.61	$ 0.55
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent	11.60%	14.40%
Tax Rate of Swiss Subsidiary	6.00%

Warranties - Analysis of Change

Warranties - Analysis of Changes in the Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Disclosure Analysis Of Changes In Liability For Product Warranties [Abstract]
Balance at beginning of period	$ 46,116	$ 48,422
Current period provisions	3,091	5,236
Costs incurred	(3,196)	(2,359)
Foreign currency translation adjustment	666	(3,224)
Balance at end of period	$ 46,677	$ 48,075

Commitments, Contingencies an43

Commitments, Contingencies and Litigation - (Additional Information) (Details) $ in Thousands, lb in Millions	1 Months Ended			3 Months Ended	12 Months Ended
	Jul. 31, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2016USD ($)	Jul. 02, 2017USD ($)lb	Mar. 31, 2017USD ($)lb
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations		$ 14,393
Reserves for anti-competition investigations				$ 27,133	$ 25,551
Provision For Environmental Liabilities				$ 1,117	$ 1,123
Lead hedge forward contracts
Commitments, Contingencies And Litigation [Line Items]
Notional amount in pounds | lb				61.5	45
Purchase price of hedges				$ 61,038	$ 46,550
Belgium Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations			$ 1,962
Reserves for anti-competition investigations				1,955	1,830
Germany Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Reserves for anti-competition investigations				14,393	13,463
Estimate of possible loss				11,415
Dutch Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Reserves for anti-competition investigations				$ 10,785	$ 10,258
Subsequent Event | Dutch Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations	$ 10,785

Restructuring Plans - Roll-forw

Restructuring Plans - Roll-forward of Restructuring Reserve (Details) $ in Thousands	3 Months Ended
	Jul. 02, 2017USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 2,812
Accrued	833
Costs incurred	(1,192)
Foreign currency impact	144
Restructuring reserve, ending balance	2,597
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	2,668
Accrued	738
Costs incurred	(1,034)
Foreign currency impact	141
Restructuring reserve, ending balance	2,513
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	144
Accrued	95
Costs incurred	(158)
Foreign currency impact	3
Restructuring reserve, ending balance	$ 84

Restructuring Plans - (Addition

Restructuring Plans - (Additional Information) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Jul. 02, 2017USD ($)Employee	Jul. 03, 2016USD ($)Employee	Mar. 31, 2017USD ($)	Mar. 31, 2016USD ($)
Restructuring Cost and Reserve [Line Items]
Charges related to restructuring plan	$ 833
Restructuring reserve	2,597		$ 2,812
Restructuring and other exit (credits)	833	$ 1,297
Restructuring charges	1,192
Non-cash restructuring charges	0	$ (718)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Charges related to restructuring plan	738
Restructuring reserve	2,513		2,668
Restructuring charges	$ 1,034
European Operations | Restructurings Related To Improving Efficiency Of Manufacturing Operations In Emea [Member]
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees | Employee	130
Charges related to restructuring plan	$ 133		3,037	$ 2,993
Restructuring reserve	379
Restructuring and other exit (credits)	100		1,251	$ 5,232
European Operations | Restructurings Related To Improving Efficiency Of Manufacturing Operations In Emea [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash restructuring charges	$ (6,600)
European Operations | Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member]
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees | Employee	45	45
Restructuring reserve	$ 2,218
Restructuring and other exit (credits)	733		3,104
Restructuring charges	930		749
Non-cash restructuring charges	(4,800)	$ (4,500)
Expected additional restructuring charges	1,000
Asia | Restructurings Related To Manufacturing Facility in Jiangdu [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)	0		779
Restructuring charges	129		$ 648
Asia | Restructurings Related To Manufacturing Facility in Jiangdu [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash restructuring charges	$ (779)

Debt - Long-term Debt Including

Debt - Long-term Debt Including Capital Lease Obligations (Details) - USD ($) $ in Thousands	Jul. 02, 2017	Mar. 31, 2017	Apr. 23, 2015
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 638,750	$ 592,500
Unamortized Issuance Costs	4,544	4,891
Long-term Debt, Excluding Current Maturities	634,206	587,609
5.00% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt	300,000	300,000	$ 300,000
Unamortized Issuance Costs	3,590	3,746
Secured Debt | Incremental Commitment Agreement | 2011 Credit Facility, due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment	338,750	292,500
Unamortized Issuance Costs	954	$ 1,145
Secured Debt | Incremental Commitment Agreement
Debt Instrument [Line Items]
Long-term debt	215,000
Secured Debt | Secured Debt | Incremental Commitment Agreement | 2011 Credit Facility, due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment	$ 123,750

Debt - (Additional Information)

Debt - (Additional Information) (Details) - USD ($)	Jul. 08, 2014	Jul. 02, 2017	Jul. 03, 2016	Mar. 31, 2015	Mar. 31, 2017	Apr. 23, 2015
Debt Instrument [Line Items]
Short-term debt		$ 25,049,000			$ 18,359,000
Short-term Debt, Weighted Average Interest Rate		6.00%			7.00%
Company Owned Capital Stock Percentage Securing Senior Secured Credit Facility				65.00%
Amortization of Other Deferred Charges		$ 347,000	$ 347
Deferred Finance Costs, Net		4,544,000			$ 4,891,000
5.00% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt		$ 300,000,000			300,000,000	$ 300,000,000
Debt Instrument Interest Rate		5.00%				5.00%
Convertible Notes Payable
Debt Instrument [Line Items]
Available lines of credit		$ 421,725,000			475,947,000
Outstanding amount		138,650,000			142,872,000
Stand by letters of credit		3,383,000			$ 2,189,000
Incremental Commitment Agreement | Revolving Commitments and/or Term Loans
Debt Instrument [Line Items]
Line of Credit Facility, Increase in Borrowing Capacity Limit	$ 300,000,000
Incremental Commitment Agreement | Secured Debt
Debt Instrument [Line Items]
Long-term debt		215,000,000
Incremental Commitment Agreement | Secured Debt | Secured Debt
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months		$ 15,000,000
LIBOR | Incremental Commitment Agreement | Revolving Commitments and/or Term Loans | Minimum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.25%
LIBOR | Incremental Commitment Agreement | Revolving Commitments and/or Term Loans | Maximum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.75%
Base Rate | Incremental Commitment Agreement | Revolving Commitments and/or Term Loans | Minimum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.25%
Base Rate | Incremental Commitment Agreement | Revolving Commitments and/or Term Loans | Maximum
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.75%
Debt Instrument Quarterly Installments Beginning June 30, 2015 through June 30, 2016
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	$ 1,875,000
Debt Instrument Quarterly Installments Beginning June 30, 2016 through September 30, 2018
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	3,750,000
Debt Instrument Final Installments Payable on September 30, 2018
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment	$ 108,750,000

Retirement Plans -Net Periodic

Retirement Plans -Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 91
Interest cost	167	170
Expected return on plan assets	(120)	(204)
Amortization and deferral	79	132
Net periodic benefit cost	126	189
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	243	223
Interest cost	432	494
Expected return on plan assets	(548)	(510)
Amortization and deferral	351	265
Net periodic benefit cost	$ 478	$ 472

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	3,177,477
Equity-based compensation expense	$ 5,230	$ 5,067
Stock options granted	169,703,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	55,422,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and restricted stock units	147,123,000
Stock option grants outstanding	615,804,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period	60,008,000
Vesting period	3 years
Vested restricted stock and restricted stock units	142,426,000
Stock option grants outstanding	357,431,000
Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding	563,860,000
Non-employee Directors | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period	1,783,000
Management | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period	160,313,000
Percentage of restricted stock units granted, vested per year	25.00%
Vesting period	4 years

Stockholders' Equity - Change i

Stockholders' Equity - Change in the Number of Shares of Common Stock Outstanding (Details)	3 Months Ended
	Jul. 02, 2017shares
Equity [Abstract]
Shares outstanding, beginning balance	43,447,536
Purchase of treasury stock	(261,117)
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes	214,836
Shares outstanding, ending balance	43,401,255

Stockholders' Equity - Componen

Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Details) $ in Thousands	3 Months Ended
	Jul. 02, 2017USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	$ 1,108,369
Ending balance	1,167,794
Pension funded status adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	25,555
Before Reclassifications	0
Amounts Reclassified from AOCI	(327)
Ending balance	25,228
Net unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	1,975
Before Reclassifications	1,814
Amounts Reclassified from AOCI	(1,239)
Ending balance	(1,078)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(129,244)
Before Reclassifications	(44,751)
Amounts Reclassified from AOCI	0
Ending balance	(84,493)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(152,824)
Before Reclassifications	42,937
Amounts Reclassified from AOCI	(912)
Ending balance	$ (110,799)

Stockholders' Equity - Reclassi

Stockholders' Equity - Reclassifications from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Equity [Abstract]
Net gain on cash flow hedging derivative instruments	$ (1,967)	$ (879)
Tax expense	728	324
Net gain on derivative instruments, net of tax	(1,239)	(555)
Prior service costs and deferrals	430	397
Tax benefit	103	116
Net periodic benefit cost, net of tax	$ 327	$ 281

Stockholders' Equity - Noncontr

Stockholders' Equity - Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 02, 2017	Jul. 03, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 4,913
Net earnings	(121)	$ (46)
Net unrealized loss on derivative instruments, net of tax	1,239	555
Pension funded status adjustment, net of tax	327	281
Total other comprehensive gain (loss), net of tax	41,991	(22,389)
Total comprehensive income	90,313	22,230
Purchase of treasury stock	(21,191)
Dividends paid to stockholders	(7,595)	(7,600)
Other, including activity related to equity awards	575	$ 5
Ending balance	$ 5,000
Dividends declared (in dollars per share)	$ 0.175	$ 0.175
Equity Attributable to EnerSys Stockholders
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,103,456
Net earnings	48,201
Net unrealized loss on derivative instruments, net of tax	(3,053)
Pension funded status adjustment, net of tax	327
Foreign currency translation adjustment	44,751
Total other comprehensive gain (loss), net of tax	42,025
Total comprehensive income	90,226
Purchase of treasury stock	(21,191)
Dividends paid to stockholders	(7,595)
Other, including activity related to equity awards	(2,102)
Ending balance	1,162,794
Nonredeemable Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	4,913
Net earnings	121
Net unrealized loss on derivative instruments, net of tax	0
Pension funded status adjustment, net of tax	0
Foreign currency translation adjustment	(34)
Total other comprehensive gain (loss), net of tax	(34)
Total comprehensive income	87
Dividends paid to stockholders	0
Other, including activity related to equity awards	0
Ending balance	5,000
Total Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,108,369
Net earnings	48,322
Net unrealized loss on derivative instruments, net of tax	(3,053)
Pension funded status adjustment, net of tax	327
Foreign currency translation adjustment	44,717
Total other comprehensive gain (loss), net of tax	41,991
Total comprehensive income	90,313
Purchase of treasury stock	(21,191)
Dividends paid to stockholders	(7,595)
Other, including activity related to equity awards	(2,102)
Ending balance	$ 1,167,794

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 02, 2017	Mar. 31, 2017
Class of Stock [Line Items]
Treasury stock purchased (in shares)	261,117
Treasury stock purchased, value	$ 21,191
Treasury stock, shares	11,184,391	10,923,274

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. 02, 2017	Jul. 03, 2016
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 48,201	$ 44,573
Basic	43,450,082	43,269,942
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired	712,992	559,871
Diluted weighted-average number of common shares outstanding	44,163,074	43,829,813
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.11	$ 1.03
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.09	$ 1.02
Anti-dilutive equity awards not included in diluted weighted-average common shares	230,811	389,956

Business Segments - (Details)

Business Segments - (Details) $ in Thousands	3 Months Ended
	Jul. 02, 2017USD ($)segment	Jul. 03, 2016USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	3
Net sales by segment to unaffiliated customers	$ 622,625	$ 600,603
Net sales by product line	622,625	600,603
Intersegment sales	41,187	31,864
Operating earnings by segment	69,611	66,032
Restructuring charges	(833)	(1,297)
Reserve power
Segment Reporting Information [Line Items]
Net sales by product line	305,177	296,041
Motive power
Segment Reporting Information [Line Items]
Net sales by product line	317,448	304,562
Americas
Segment Reporting Information [Line Items]
Net sales by segment to unaffiliated customers	354,603	329,720
Intersegment sales	7,237	6,004
Operating earnings by segment	53,661	43,310
Restructuring charges	0	(892)
Europe
Segment Reporting Information [Line Items]
Net sales by segment to unaffiliated customers	199,077	197,130
Intersegment sales	28,817	22,163
Operating earnings by segment	13,539	19,836
Restructuring charges	(833)	(269)
Asia
Segment Reporting Information [Line Items]
Net sales by segment to unaffiliated customers	68,945	73,753
Intersegment sales	5,133	3,697
Operating earnings by segment	3,244	4,183
Restructuring charges	$ 0	$ (136)

Subsequent Events - (Details)

Subsequent Events - (Details) - Subsequent Event - USD ($)	Aug. 02, 2017	Aug. 09, 2017	Aug. 04, 2017	Aug. 03, 2017
Subsequent Event [Line Items]
Common stock dividends (in dollars per share)	$ 0.175
Stock repurchase authorization		$ 100,000
2011 Credit Facility, due 2018 | Revolving Credit Facility
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity				$ 500,000,000
2017 Credit Facility, due 2022 | Revolving Credit Facility
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity			$ 600,000
Secured Debt | 2011 Credit Facility, due 2018
Subsequent Event [Line Items]
Debt instrument, face amount				$ 150,000,000
Secured Debt | 2017 Credit Facility, due 2022
Subsequent Event [Line Items]
Debt instrument, face amount			$ 150,000