EnerSys (ENS) 10-Q 8 Feb 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Jan. 01, 2017	Feb. 03, 2017
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jan. 1, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
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		43,430,129

Consolidated Condensed Balance

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Jan. 01, 2017	Mar. 31, 2016
Current assets:
Cash and cash equivalents	$ 467,149	$ 397,307
Accounts receivable, net of allowance for doubtful accounts: January 1, 2017 - $12,594; March 31, 2016 - $11,393	444,265	490,799
Total	370,196	331,081
Prepaid and other current assets	84,262	77,052
Total current assets	1,365,872	1,296,239
Property, plant, and equipment, net	341,715	357,409
Goodwill	336,816	353,547
Other intangible assets, net	156,771	159,658
Deferred taxes	32,418	33,530
Other assets	12,421	14,105
Total assets	2,246,013	2,214,488
Current liabilities:
Short-term debt	35,879	22,144
Accounts payable	202,885	228,442
Accrued expenses	224,009	200,585
Total current liabilities	462,773	451,171
Long-term Debt, Excluding Current Maturities	600,562	606,221
Deferred taxes	45,243	46,008
Other liabilities	77,952	86,656
Total liabilities	1,186,530	1,190,056
Commitments and contingencies
Redeemable noncontrolling interests	0	5,997
Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at January 1, 2017 and at March 31, 2016	0	0
Common Stock, $0.01 par value per share, 135,000,000 shares authorized; 54,353,403 shares issued and 43,430,129 shares outstanding at January 1, 2017; 54,112,776 shares issued and 43,189,502 shares outstanding at March 31, 2016	544	541
Additional paid-in capital	459,065	452,097
Treasury stock, at cost, 10,923,274 shares held as of January 1, 2017 and as of March 31, 2016	(439,800)	(439,800)
Retained earnings	1,205,458	1,097,642
Accumulated other comprehensive income	(170,707)	(97,349)
Total EnerSys stockholders' equity	1,054,560	1,013,131
Noncontrolling interests	4,923	5,304
Total equity	1,059,483	1,018,435
Total liabilities and equity	$ 2,246,013	$ 2,214,488

Consolidated Condensed Balance3

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jan. 01, 2017	Mar. 31, 2016
Accounts receivable, allowance for doubtful accounts	$ 12,594	$ 11,393
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	54,353,403	54,112,776
Common stock, shares outstanding	43,430,129	43,189,502
Treasury stock, shares	10,923,274	10,923,274

Consolidated Condensed Statemen

Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Income Statement [Abstract]
Net sales	$ 563,697	$ 573,573	$ 1,740,348	$ 1,704,775
Cost of goods sold	408,315	427,691	1,254,678	1,253,539
Inventory write-off relating to exit activities - See Note 8	(502)	0	2,157	0
Gross profit	155,884	145,882	483,513	451,236
Operating expenses	85,014	87,217	277,512	261,286
Restructuring and other exit (credits) charges - See Note 8	(1,153)	3,204	5,037	7,051
Legal proceedings charge - See Note 7	17,000	0	17,000	3,201
Gain on sale of facility			0	(4,348)
Operating earnings	55,023	55,461	183,964	184,046
Interest expense	5,646	5,329	16,820	16,696
Other (income) expense, net	(1,247)	1,142	(496)	2,573
Earnings before income taxes	50,624	48,990	167,640	164,777
Income tax expense	13,529	10,776	43,133	38,861
Net earnings	37,095	38,214	124,507	125,916
Net earnings (losses) attributable to noncontrolling interests	860	(264)	(1,937)	(974)
Net earnings attributable to EnerSys stockholders	$ 36,235	$ 38,478	$ 126,444	$ 126,890
Net earnings per common share attributable to EnerSys stockholders:
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.83	$ 0.87	$ 2.92	$ 2.85
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	0.82	0.86	2.88	2.76
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175	$ 0.525	$ 0.525
Weighted average shares of common stock outstanding:
Basic	43,429,525	44,394,925	43,375,474	44,524,289
Diluted	44,049,674	44,976,204	43,943,010	45,912,659

Consolidated Condensed Stateme5

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 37,095	$ 38,214	$ 124,507	$ 125,916
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments, net of tax	(2,017)	4,021	411	(1,416)
Pension funded status adjustment, net of tax	198	292	747	930
Foreign currency translation adjustments	(52,754)	(13,099)	(74,922)	(20,754)
Total other comprehensive loss, net of tax	(54,573)	(8,786)	(73,764)	(21,240)
Total comprehensive (loss) income	(17,478)	29,428	50,743	104,676
Comprehensive loss attributable to noncontrolling interests	648	(823)	(2,343)	(2,399)
Comprehensive income attributable to EnerSys stockholders	$ (18,126)	$ 30,251	$ 53,086	$ 107,075

Consolidated Condensed Stateme6

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015
Cash flows from operating activities
Net earnings	$ 124,507	$ 125,916
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	40,468	41,915
Write-off of assets relating to restructuring and other exit charges	1,435	398
Non-cash write-off of property, plant and equipment	6,300
Derivatives not designated in hedging relationships:
Net losses	202	119
Cash (settlements) proceeds	(646)	386
Provision for doubtful accounts	1,952	3,169
Deferred income taxes	(683)	(3,248)
Non-cash interest expense	1,041	2,447
Stock-based compensation	14,556	14,883
Gain on sale of facility	0	(4,348)
Legal proceedings accrual (reversal of legal accrual, net of fees )	17,000	(799)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	22,843	53,969
Inventories	(55,888)	(5,705)
Prepaid and other current assets	(11,545)	1,646
Other assets	857	(1,201)
Accounts payable	(14,701)	(1,244)
Accrued expenses	13,856	2,498
Other liabilities	5,163	1,922
Net cash provided by operating activities	166,707	232,715
Cash flows from investing activities
Capital expenditures	(36,008)	(45,695)
Purchase of businesses	(12,392)	(39,079)
Net cash used in investing activities	(47,832)	(74,729)
Cash flows from financing activities
Net increase in short-term debt	13,639	5,535
Proceeds from revolving credit borrowings	191,300	300,000
Repayments of revolving credit borrowings	(186,750)	(288,000)
Proceeds from long-term debt	0	300,000
Repayments of Convertible Notes	0	(172,266)
Repayments of long-term debt	(11,250)	(3,750)
Debt issuance costs	0	(4,986)
Option proceeds	5	139
Payment of taxes related to net share settlement of equity awards	(7,668)	(15,348)
Excess tax benefits from exercise of stock options and vesting of equity awards	0	4,175
Purchase of treasury stock	0	(120,637)
Prepayment of accelerated stock repurchase	0	(60,000)
Dividends paid to stockholders	(22,800)	(23,322)
Other	(77)	(106)
Net cash used in financing activities	(23,601)	(78,566)
Effect of exchange rate changes on cash and cash equivalents	(25,432)	(2,224)
Net increase in cash and cash equivalents	69,842	77,196
Cash and cash equivalents at beginning of period	397,307	268,921
Cash and cash equivalents at end of period	467,149	346,117
Manufacturing Facility
Derivatives not designated in hedging relationships:
Gain on sale of facility	0	(4,348)
Cash flows from investing activities
Proceeds from disposal of property, plant, and equipment	0	9,179
Property, Plant, and Equipment Excluding Manufacturing Facility [Member]
Derivatives not designated in hedging relationships:
Gain on sale of facility	(10)	(8)
Cash flows from investing activities
Proceeds from disposal of property, plant, and equipment	$ 568	$ 866

Basis of Presentation

Basis of Presentation	9 Months Ended
	Jan. 01, 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 2016 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on May 31, 2016 (the " 2016 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 2017 end on July 3, 2016, October 2, 2016, January 1, 2017, and March 31, 2017, respectively. The four quarters in fiscal 2016 ended on June 28, 2015, September 27, 2015, December 27, 2015, and March 31, 2016, respectively. The consolidated condensed financial statements include the accounts of the Company and its wholly-owned subsidiaries and any partially owned subsidiaries that the Company has the ability to control. All intercompany transactions and balances have been eliminated in consolidation. The Company also consolidates certain subsidiaries in which the noncontrolling interest party has within its control the right to require the Company to redeem all or a portion of its interest in the subsidiary. The redeemable noncontrolling interests are reported at their estimated redemption value. Any adjustment to the redemption value impacts retained earnings but does not impact net income or comprehensive income. Noncontrolling interests which are redeemable only upon future events, the occurrence of which is not currently probable, are recorded at carrying value. 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 not yet selected a transition method and is currently evaluating the impact, if any, of the adoption of this guidance on its consolidated financial statements. 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 March 2016, the FASB issued ASU 2016-09, “Improvements to Employee Share-Based Payment Accounting (Topic 718)”. This update simplifies several aspects related to how share-based payments are accounted for and presented in the financial statements, including the accounting for forfeitures and tax-effects related to share-based payments at settlement, and the classification of excess tax benefits and shares surrendered for tax withholdings in the statement of cash flows. This update is effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years, with early adoption permitted. The Company early adopted this standard for the quarter ended July 3, 2016. The impact of the adoption of this standard was as follows: • approximately $780 of excess tax benefits was recorded through income tax expense for the nine months of fiscal 2017 as a discrete item, adopted on a prospective basis; • excess tax benefits were included within operating cash flows adopted on a prospective basis; • cash paid by the Company when directly withholding shares to satisfy an employee's statutory tax obligations continued to be classified as a financing activity; and • no impact on prior periods due to adopting the guidance on a prospective basis.

Inventories

Inventories	9 Months Ended
	Jan. 01, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories, net consist of: January 1, 2017 March 31, 2016 Raw materials $ 93,354 $ 84,198 Work-in-process 113,220 104,085 Finished goods 163,622 142,798 Total $ 370,196 $ 331,081

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Jan. 01, 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 January 1, 2017 and March 31, 2016 and the basis for that measurement: Total Fair Value Measurement January 1, 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 $ (3,015 ) $ — $ (3,015 ) $ — Foreign currency forward contracts 5 — 5 — Total derivatives $ (3,010 ) $ — $ (3,010 ) $ — Total Fair Value Measurement March 31, 2016 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ (499 ) $ — $ (499 ) $ — Foreign currency forward contracts (988 ) — (988 ) — Total derivatives $ (1,487 ) $ — $ (1,487 ) $ — 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 2016 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 101% and 96% of face value on January 1, 2017 and March 31, 2016 , respectively. The carrying amounts and estimated fair values of the Company’s derivatives and Notes at January 1, 2017 and March 31, 2016 were as follows: January 1, 2017 March 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Derivatives (1) $ 5 $ 5 $ — $ — Financial liabilities: Notes (2) $ 300,000 $ 303,000 $ 300,000 $ 288,000 Derivatives (1) 3,015 3,015 1,487 1,487 (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 January 1, 2017 and March 31, 2016 ). (2) The fair value amount of the Notes at January 1, 2017 and March 31, 2016

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Jan. 01, 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 and the notional amounts at January 1, 2017 and March 31, 2016 were 34.5 million pounds and 27.4 million pounds, 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 January 1, 2017 and March 31, 2016 , the Company had entered into a total of $24,868 and $18,206 , respectively, of such contracts. In the coming twelve months, the Company anticipates that $1,217 of pretax gain 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 January 1, 2017 and March 31, 2016 , the notional amount of these contracts was $15,948 and $11,156 , 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 January 1, 2017 and March 31, 2016 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments January 1, 2017 March 31, 2016 January 1, 2017 March 31, 2016 Prepaid and other current assets Foreign currency forward contracts $ 200 $ — $ — $ — Total assets $ 200 $ — $ — $ — Accrued expenses Lead forward contracts $ 3,015 $ 499 $ — $ — Foreign currency forward contracts — 350 195 638 Total liabilities $ 3,015 $ 849 $ 195 $ 638 The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended January 1, 2017 Derivatives Designated as Cash Flow Hedges Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Lead forward contracts $ (2,362 ) Cost of goods sold $ 1,524 Foreign currency forward contracts 595 Cost of goods sold (93 ) Total $ (1,767 ) $ 1,431 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 $ (25 ) Total $ (25 ) The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended December 27, 2015 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 $ 1,109 Cost of goods sold $ (4,448 ) Foreign currency forward contracts 525 Cost of goods sold (296 ) Total $ 1,634 $ (4,744 ) 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 $ 175 Total $ 175 The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the nine months ended January 1, 2017 Derivatives Designated as Cash Flow Hedges Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Lead forward contracts $ 2,258 Cost of goods sold $ 2,800 Foreign currency forward contracts 873 Cost of goods sold (319 ) Total $ 3,131 $ 2,481 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 $ (202 ) Total $ (202 ) The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the nine months ended December 27, 2015 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 $ (4,006 ) Cost of goods sold $ (7,461 ) Foreign currency forward contracts (2,048 ) Cost of goods sold 3,655 Total $ (6,054 ) $ (3,806 ) 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 $ (119 ) Total $ (119 )

Income Taxes

Income Taxes	9 Months Ended
	Jan. 01, 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 third quarters of fiscal 2017 and 2016 was based on the estimated effective tax rates applicable for the full years ending March 31, 2017 and March 31, 2016 , 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 26.7% and 22.0% , respectively, for the third quarters of fiscal 2017 and 2016 and 25.7% and 23.6% , respectively, for the nine months of fiscal 2017 and 2016. The rate increase in the third quarter of fiscal 2017 compared to the third quarter of fiscal 2016 is primarily due to the German regulatory proceedings charge of $17,000 (with no associated tax benefit) recorded in the third quarter of fiscal 2017 and the recognition of a tax benefit in fiscal 2016 related to international restructuring, partially offset by a decrease related to changes in the mix of earnings among tax jurisdictions. The rate increase in the nine months of fiscal 2017 compared to the nine months of fiscal 2016 is primarily due to the aforementioned German regulatory proceedings charge (with no associated tax benefit) recorded in the third quarter of fiscal 2017 and the recognition of a tax benefit in fiscal 2016 related to international restructuring, the subsequent recognition of a domestic deferred tax asset related to executive compensation and the subsequent recognition of a previously unrecognized tax position related to one of the Company's foreign subsidiaries, partially offset by a decrease related to changes in the mix of earnings among tax jurisdictions. Foreign income as a percentage of worldwide income is estimated to be 60% for the nine months of fiscal 2017 compared to 51% for the nine months of fiscal 2016 . The foreign effective income tax rates for the nine months of fiscal 2017 and 2016 were 15.9% and 10.1% , respectively. The rate increase compared to the prior year period is primarily due to the aforementioned German regulatory proceedings charge (with no associated tax benefit) recorded in the third quarter of fiscal 2017 and the recognition of a tax benefit in fiscal 2016 related to international restructuring and the subsequent recognition of a previously unrecognized tax position related to one of the Company's foreign subsidiaries, partially offset by a decrease related 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	9 Months Ended
	Jan. 01, 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 Nine months ended January 1, 2017 December 27, 2015 January 1, 2017 December 27, 2015 Balance at beginning of period $ 48,112 $ 40,140 $ 48,422 $ 39,810 Current period provisions 4,085 5,756 14,932 14,339 Costs incurred (4,250 ) (4,422 ) (12,492 ) (12,930 ) Foreign currency translation adjustment (1,720 ) (427 ) (4,635 ) (172 ) Balance at end of period $ 46,227 $ 41,047 $ 46,227 $ 41,047

Commitments, Contingencies and

Commitments, Contingencies and Litigation	9 Months Ended
	Jan. 01, 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 January 1, 2017 and March 31, 2016 , the Company had a reserve balance of $1,804 and $2,038 , respectively, relating to the Belgian regulatory proceeding. The change in the reserve balance between January 1, 2017 and March 31, 2016 was solely due to foreign currency translation impact. The Company currently estimates that the aggregate range of possible loss with respect to the German regulatory proceeding is $17,000 to $26,000 and has reserved $17,000 in connection with this matter. For the Dutch regulatory proceeding, the Company does not believe that an estimate can be made at this time given the current stage of this proceeding. As of January 1, 2017 and March 31, 2016 , the Company had a total reserve balance of $18,804 and $2,038 , respectively, in connection with these remaining investigations and other related legal matters. 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, 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 $1,123 as of January 1, 2017 and March 31, 2016 . 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 Contracts To stabilize its costs, the Company has entered into contracts with financial institutions to fix the price of lead. The vast majority of such contracts are for a period not extending beyond one year. Under these contracts, at January 1, 2017 and March 31, 2016 , the Company has hedged the price to purchase approximately 34.5 million pounds and 27.4 million pounds of lead, respectively, for a total purchase price of $34,420 and $21,628 , respectively. Foreign Currency Forward Contracts The Company quantifies and monitors its global foreign currency exposures. On a selective basis, the Company will enter into foreign currency forward and option contracts to reduce the volatility from currency movements that affect the Company. The vast majority of such contracts are for a period not extending beyond one year. The Company’s largest exposure is from the purchase and conversion of U.S. dollar based lead costs into local currencies in EMEA. Additionally, the Company has currency exposures from intercompany financing and intercompany and third party trade transactions. To hedge these exposures, the Company has entered into a total of $40,816 and $29,362 , respectively, of foreign currency forward contracts with financial institutions as of January 1, 2017 and March 31, 2016

Restructuring Plans

Restructuring Plans	9 Months Ended
	Jan. 01, 2017
Text Block [Abstract]
Restructuring Plans	Restructuring and Other Exit Charges During the second quarter of fiscal 2016 , the Company announced a restructuring 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, during the third quarter of fiscal 2016 , 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 $6,500 , 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 $942 during the nine months of fiscal 2017 . The Company incurred $2,993 in costs against the accrual in fiscal 2016 and incurred an additional $2,671 against the accrual during the nine months of fiscal 2017. As of January 1, 2017 , the reserve balance associated with these actions is $435 . The Company expects to be committed to an additional $300 of restructuring charges related to these actions during fiscal 2017 , and expects to complete the program during fiscal 2017 . During the second quarter of fiscal 2016 , the Company announced a restructuring related to improving the efficiency of its manufacturing operations in the Americas. The program, which was completed during the first quarter of fiscal 2017 , consisted of closing its Cleveland, Ohio charger manufacturing facility and the transfer of charger production to other Americas manufacturing facilities. The total charges for all actions associated with this program amounted to $2,379 , primarily from cash charges for employee severance-related payments and other charges of $1,043 , along with a pension curtailment charge of $313 and non-cash charges related to the accelerated depreciation of fixed assets of $1,023 . The program resulted in the reduction of approximately 100 employees at its Cleveland facility. In fiscal 2016 , the Company recorded restructuring charges of $1,488 including a pension curtailment charge of $313 and non-cash charges of $305 and recorded an additional $174 in cash charges and $718 in non-cash charges during the first quarter of fiscal 2017 . The Company incurred $119 in costs against the accrual in fiscal 2016 and incurred an additional $924 against the accrual during the first quarter of fiscal 2017. During the first and second quarters of 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 $4,500 , 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 the nine months of fiscal 2017 , the Company recorded restructuring charges of $1,586 and incurred $217 in costs against the accrual. As of January 1, 2017 , the reserve balance associated with these actions is $1,298 . The Company expects to be committed to an additional $2,900 in restructuring charges related to this action through 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 the first quarter of fiscal 2016 . The Company estimates that the total cash charges for these actions will amount to approximately $600 . During the nine months of fiscal 2017 , the Company recorded charges of $483 and incurred $483 in costs against the accrual. As of January 1, 2017 , the reserve balance associated with these actions is $0 . The Company expects to be committed to an additional $100 in charges related to this action through fiscal 2017 , when it expects to complete this program. A roll-forward of the restructuring reserve is as follows: Employee Severance Other Total Balance as of March 31, 2016 $ 2,964 $ 25 $ 2,989 Accrued 2,417 768 3,185 Costs incurred (3,749 ) (546 ) (4,295 ) Foreign currency impact and other (133 ) (13 ) (146 ) Balance as of January 1, 2017 $ 1,499 $ 234 $ 1,733 Other Exit Charges During the nine months of fiscal 2017 , the Company recorded exit charges of $3,303 related to the South Africa joint venture, consisting of cash charges of $2,586 primarily relating to severance and non-cash charges of $717 . Included in the non-cash charges are $2,157 relating to the inventory adjustment which is reported in cost of goods sold, partially offset by a credit of $1,099 relating to a change in estimate of contract losses and a $341 gain on deconsolidation of the joint venture. Weakening of the general economic environment in South Africa, exacerbated by limited growth in the mining industry and competitive products flooding the market, affected the joint venture’s ability to compete effectively in the marketplace and consequently, the Company initiated an exit plan in consultation with its joint venture partner in the second quarter of fiscal 2017

Debt

Debt	9 Months Ended
	Jan. 01, 2017
Text Block [Abstract]
Debt	Debt The following summarizes the Company’s long-term debt as of January 1, 2017 and March 31, 2016 : January 1, 2017 March 31, 2016 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs 5.00% Senior Notes due 2023 $ 300,000 $ 3,902 $ 300,000 $ 4,370 2011 Credit Facility, due 2018 305,800 1,336 312,500 1,909 $ 605,800 $ 5,238 $ 612,500 $ 6,279 Less: Unamortized issuance costs 5,238 6,279 Long-term debt, net of unamortized issuance costs $ 600,562 $ 606,221 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 revolving 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 January 1, 2017 , the Company had $174,550 outstanding in revolver borrowings and $131,250 under its Term Loan borrowings. Short-Term Debt As of January 1, 2017 and March 31, 2016 , the Company had $35,879 and $22,144 , respectively, of short-term borrowings. The weighted-average interest rate on these borrowings was approximately 7% and 8% at January 1, 2017 and March 31, 2016 , respectively. Letters of Credit As of January 1, 2017 and March 31, 2016 , the Company had $4,001 and $2,693 , respectively, of standby letters of credit. Debt Issuance Costs Amortization expense, relating to debt issuance costs, included in interest expense was $347 and $343 , respectively, during the quarters ended January 1, 2017 and December 27, 2015 and $1,041 and $1,117 for the nine months ended January 1, 2017 and December 27, 2015 , respectively. Debt issuance costs, net of accumulated amortization, totaled $5,238 and $ 6,279 , respectively, at January 1, 2017 and March 31, 2016 . Available Lines of Credit As of January 1, 2017 and March 31, 2016 , the Company had available and undrawn, under all its lines of credit, $451,267 and $472,187 , respectively, including $127,742 and $144,112 , respectively, of uncommitted lines of credit as of January 1, 2017 and March 31, 2016

Retirement Plans

Retirement Plans	9 Months Ended
	Jan. 01, 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 January 1, December 27, 2015 January 1, December 27, 2015 Service cost $ 96 $ 118 $ 212 $ 201 Interest cost 158 172 441 476 Expected return on plan assets (204 ) (213 ) (442 ) (563 ) Amortization and deferral 76 111 238 310 Curtailment loss — 313 — — Net periodic benefit cost $ 126 $ 501 $ 449 $ 424 United States Plans International Plans Nine months ended Nine months ended January 1, December 27, 2015 January 1, December 27, 2015 Service cost $ 278 $ 364 $ 658 $ 617 Interest cost 498 510 1,402 1,447 Expected return on plan assets (612 ) (643 ) (1,424 ) (1,715 ) Amortization and deferral 340 370 756 946 Curtailment loss — 313 — — Net periodic benefit cost $ 504 $ 914 $ 1,392 $ 1,295

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Jan. 01, 2017
Text Block [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of January 1, 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 $4,699 for the third quarter of fiscal 2017 and $4,545 for the third quarter of fiscal 2016 . Stock-based compensation expense was $14,556 for the nine months of fiscal 2017 and $14,883 for the nine months of fiscal 2016 . The Company recognizes compensation expense using the straight-line method over the vesting period of the awards, except for awards issued to certain retirement-eligible participants, which are expensed on an accelerated basis. During the nine months ended January 1, 2017 , the Company granted to non-employee directors 25,230 restricted stock units, pursuant to the 2010 EIP. During the nine months ended January 1, 2017 , the Company granted to management and other key employees 242,068 non-qualified stock options and 83,720 market condition-based share units that vest three years from the date of grant, and 235,358 restricted stock units that vest 25% each year over four years from the date of grant. Common stock activity during the nine months ended January 1, 2017 included the vesting of 143,043 restricted stock units and 232,817 market condition-based share units and the exercise of 263 stock options. As of January 1, 2017 , there were 451,668 non-qualified stock options, 612,626 restricted stock units and 448,567

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Jan. 01, 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 nine months ended January 1, 2017 : Shares outstanding as of March 31, 2016 43,189,502 Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes 240,627 Shares outstanding as of January 1, 2017 43,430,129 Treasury Stock There were no repurchases of treasury stock during the nine months ended January 1, 2017 , and the Company held 10,923,274 shares as treasury stock at January 1, 2017 and March 31, 2016 . Accumulated Other Comprehensive Income ("AOCI") The components of AOCI, net of tax, as of January 1, 2017 and March 31, 2016 , are as follows: March 31, 2016 Before Reclassifications Amounts Reclassified from AOCI January 1, 2017 Pension funded status adjustment $ (21,861 ) $ — $ 747 $ (21,114 ) Net unrealized gain (loss) on derivative instruments 388 1,977 (1,566 ) 799 Foreign currency translation adjustment (75,876 ) (74,516 ) — (150,392 ) Accumulated other comprehensive income (loss) $ (97,349 ) $ (72,539 ) $ (819 ) $ (170,707 ) The following table presents reclassifications from AOCI during the third quarter ended January 1, 2017 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in Cash Flow Hedging Relationships: Net unrealized gain on derivative instruments $ (1,431 ) Cost of goods sold Tax expense 528 Net unrealized gain on derivative instruments, net of tax $ (903 ) Defined benefit pension costs: Prior service costs and deferrals $ 314 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 $ 198 The following table presents reclassifications from AOCI during the third quarter ended December 27, 2015 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in Cash Flow Hedging Relationships: Net unrealized loss on derivative instruments $ 4,744 Cost of goods sold Tax benefit (1,753 ) Net unrealized loss on derivative instruments, net of tax $ 2,991 Defined benefit pension costs: Prior service costs and deferrals $ 421 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (129 ) Net periodic benefit cost, net of tax $ 292 The following table presents reclassifications from AOCI during the nine months ended January 1, 2017 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in Cash Flow Hedging Relationships: Net unrealized gain on derivative instruments $ (2,481 ) Cost of goods sold Tax expense 915 Net unrealized gain on derivative instruments, net of tax $ (1,566 ) Defined benefit pension costs: Prior service costs and deferrals $ 1,096 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (349 ) Net periodic benefit cost, net of tax $ 747 The following table presents reclassifications from AOCI during the nine months ended December 27, 2015 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in Cash Flow Hedging Relationships: Net unrealized loss on derivative instruments $ 3,806 Cost of goods sold Tax benefit (1,404 ) Net unrealized loss on derivative instruments, net of tax $ 2,402 Defined benefit pension costs: Prior service costs and deferrals $ 1,316 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (386 ) Net periodic benefit cost, net of tax $ 930 The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the nine months ended January 1, 2017 : Equity Attributable to EnerSys Stockholders Nonredeemable Noncontrolling Interests Total Equity Balance as of March 31, 2016 $ 1,013,131 $ 5,304 $ 1,018,435 Total comprehensive income (loss): Net earnings 126,444 84 126,528 Net unrealized gain on derivative instruments, net of tax 411 — 411 Pension funded status adjustment, net of tax 747 — 747 Foreign currency translation adjustment (74,516 ) (465 ) (74,981 ) Total other comprehensive loss, net of tax (73,358 ) (465 ) (73,823 ) Total comprehensive income (loss) 53,086 (381 ) 52,705 Other changes in equity: Cash dividends - common stock ($0.525 per share) (22,800 ) — (22,800 ) Other, including activity related to equity awards 11,143 — 11,143 Balance as of January 1, 2017 $ 1,054,560 $ 4,923 $ 1,059,483 The following demonstrates the change in redeemable noncontrolling interests during the nine months ended January 1, 2017 : Redeemable Noncontrolling Interests Balance as of March 31, 2016 $ 5,997 Net loss (2,021 ) Deconsolidation of joint venture (4,035 ) Foreign currency translation adjustment 59 Balance as of January 1, 2017 $ —

Earnings Per Share

Earnings Per Share	9 Months Ended
	Jan. 01, 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 Nine months ended January 1, 2017 December 27, 2015 January 1, 2017 December 27, 2015 Net earnings attributable to EnerSys stockholders $ 36,235 $ 38,478 $ 126,444 $ 126,890 Weighted-average number of common shares outstanding: Basic 43,429,525 44,394,925 43,375,474 44,524,289 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 620,149 581,279 567,536 650,529 3.375% Convertible Notes due 2038 (1) — — — 737,841 Diluted weighted-average number of common shares outstanding 44,049,674 44,976,204 43,943,010 45,912,659 Basic earnings per common share attributable to EnerSys stockholders $ 0.83 $ 0.87 $ 2.92 $ 2.85 Diluted earnings per common share attributable to EnerSys stockholders $ 0.82 $ 0.86 $ 2.88 $ 2.76 Anti-dilutive equity awards not included in diluted weighted-average common shares 62,470 — 232,542 — (1 ) On July 17, 2015, the Company paid $172,388 , in aggregate, towards the principal balance of the 3.375% Convertible Notes due 2038, including accreted interest, cash equivalent of fractional shares issued towards conversion premium and settled the conversion premium by issuing, in the aggregate, 1,889,431

Business Segments

Business Segments	9 Months Ended
	Jan. 01, 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 third quarter and nine months ended January 1, 2017 and December 27, 2015 is shown below: Quarter ended Nine months ended January 1, 2017 December 27, 2015 January 1, 2017 December 27, 2015 Net sales by segment to unaffiliated customers Americas $ 313,972 $ 306,331 $ 968,516 $ 945,839 EMEA 186,069 196,829 563,765 582,896 Asia 63,656 70,413 208,067 176,040 Total net sales $ 563,697 $ 573,573 $ 1,740,348 $ 1,704,775 Net sales by product line Reserve power $ 271,291 $ 271,948 $ 844,781 $ 810,448 Motive power 292,406 301,625 895,567 894,327 Total net sales $ 563,697 $ 573,573 $ 1,740,348 $ 1,704,775 Intersegment sales Americas $ 6,319 $ 6,334 $ 19,304 $ 23,041 EMEA 22,086 17,537 66,186 59,999 Asia 6,285 8,205 18,070 20,937 Total intersegment sales (1) $ 34,690 $ 32,076 $ 103,560 $ 103,977 Operating earnings by segment Americas $ 45,949 $ 40,572 $ 139,149 $ 134,344 EMEA 20,435 16,525 57,268 54,218 Asia 3,984 1,568 11,741 1,388 Restructuring charges - Americas — (865 ) (892 ) (1,435 ) Inventory adjustment relating to exit activities - EMEA 502 — (2,157 ) — Restructuring and other exit credits (charges) - EMEA 1,153 (2,153 ) (3,663 ) (4,706 ) Restructuring charges - Asia — (186 ) (482 ) (910 ) Reversal of legal accrual, net of fees - Americas — — — 799 Legal proceedings charge - EMEA (17,000 ) — (17,000 ) (4,000 ) Gain on sale of facility - Asia — — — 4,348 Total operating earnings (2) $ 55,023 $ 55,461 $ 183,964 $ 184,046 (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	9 Months Ended
	Jan. 01, 2017
Text Block [Abstract]
Subsequent Events	Subsequent Events On February 8, 2017, the Board of Directors approved a quarterly cash dividend of $0.175

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Jan. 01, 2017
Inventory Disclosure [Abstract]
Summary Of Inventories	Inventories, net consist of: January 1, 2017 March 31, 2016 Raw materials $ 93,354 $ 84,198 Work-in-process 113,220 104,085 Finished goods 163,622 142,798 Total $ 370,196 $ 331,081

Fair Value of Financial Instr23

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Jan. 01, 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 January 1, 2017 and March 31, 2016 and the basis for that measurement: Total Fair Value Measurement January 1, 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 $ (3,015 ) $ — $ (3,015 ) $ — Foreign currency forward contracts 5 — 5 — Total derivatives $ (3,010 ) $ — $ (3,010 ) $ — Total Fair Value Measurement March 31, 2016 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ (499 ) $ — $ (499 ) $ — Foreign currency forward contracts (988 ) — (988 ) — Total derivatives $ (1,487 ) $ — $ (1,487 ) $ —
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 January 1, 2017 and March 31, 2016 were as follows: January 1, 2017 March 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Derivatives (1) $ 5 $ 5 $ — $ — Financial liabilities: Notes (2) $ 300,000 $ 303,000 $ 300,000 $ 288,000 Derivatives (1) 3,015 3,015 1,487 1,487 (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 January 1, 2017 and March 31, 2016 ). (2) The fair value amount of the Notes at January 1, 2017 and March 31, 2016 represent the trading value of the Notes.

Derivative Financial Instrume24

Derivative Financial Instruments (Tables)	9 Months Ended
	Jan. 01, 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 January 1, 2017 and March 31, 2016 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments January 1, 2017 March 31, 2016 January 1, 2017 March 31, 2016 Prepaid and other current assets Foreign currency forward contracts $ 200 $ — $ — $ — Total assets $ 200 $ — $ — $ — Accrued expenses Lead forward contracts $ 3,015 $ 499 $ — $ — Foreign currency forward contracts — 350 195 638 Total liabilities $ 3,015 $ 849 $ 195 $ 638
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 January 1, 2017 Derivatives Designated as Cash Flow Hedges Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion) Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion) Lead forward contracts $ (2,362 ) Cost of goods sold $ 1,524 Foreign currency forward contracts 595 Cost of goods sold (93 ) Total $ (1,767 ) $ 1,431 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 $ (25 ) Total $ (25 ) The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended December 27, 2015 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 $ 1,109 Cost of goods sold $ (4,448 ) Foreign currency forward contracts 525 Cost of goods sold (296 ) Total $ 1,634 $ (4,744 ) 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 $ 175 Total $ 175

Warranties (Tables)

Warranties (Tables)	9 Months Ended
	Jan. 01, 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 Nine months ended January 1, 2017 December 27, 2015 January 1, 2017 December 27, 2015 Balance at beginning of period $ 48,112 $ 40,140 $ 48,422 $ 39,810 Current period provisions 4,085 5,756 14,932 14,339 Costs incurred (4,250 ) (4,422 ) (12,492 ) (12,930 ) Foreign currency translation adjustment (1,720 ) (427 ) (4,635 ) (172 ) Balance at end of period $ 46,227 $ 41,047 $ 46,227 $ 41,047

Restructuring Plans (Tables)

Restructuring Plans (Tables)	9 Months Ended
	Jan. 01, 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, 2016 $ 2,964 $ 25 $ 2,989 Accrued 2,417 768 3,185 Costs incurred (3,749 ) (546 ) (4,295 ) Foreign currency impact and other (133 ) (13 ) (146 ) Balance as of January 1, 2017 $ 1,499 $ 234 $ 1,733

Debt (Tables)

Debt (Tables)	9 Months Ended
	Jan. 01, 2017
Text Block [Abstract]
Long-Term Debt And Capital Lease Obligations	The following summarizes the Company’s long-term debt as of January 1, 2017 and March 31, 2016 : January 1, 2017 March 31, 2016 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs 5.00% Senior Notes due 2023 $ 300,000 $ 3,902 $ 300,000 $ 4,370 2011 Credit Facility, due 2018 305,800 1,336 312,500 1,909 $ 605,800 $ 5,238 $ 612,500 $ 6,279 Less: Unamortized issuance costs 5,238 6,279 Long-term debt, net of unamortized issuance costs $ 600,562 $ 606,221

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Jan. 01, 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 January 1, December 27, 2015 January 1, December 27, 2015 Service cost $ 96 $ 118 $ 212 $ 201 Interest cost 158 172 441 476 Expected return on plan assets (204 ) (213 ) (442 ) (563 ) Amortization and deferral 76 111 238 310 Curtailment loss — 313 — — Net periodic benefit cost $ 126 $ 501 $ 449 $ 424

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Jan. 01, 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 nine months ended January 1, 2017 : Shares outstanding as of March 31, 2016 43,189,502 Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes 240,627 Shares outstanding as of January 1, 2017 43,430,129
Components Of Accumulated Other Comprehensive Income	The following table presents reclassifications from AOCI during the third quarter ended January 1, 2017 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in Cash Flow Hedging Relationships: Net unrealized gain on derivative instruments $ (1,431 ) Cost of goods sold Tax expense 528 Net unrealized gain on derivative instruments, net of tax $ (903 ) Defined benefit pension costs: Prior service costs and deferrals $ 314 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 $ 198 The following table presents reclassifications from AOCI during the third quarter ended December 27, 2015 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in Cash Flow Hedging Relationships: Net unrealized loss on derivative instruments $ 4,744 Cost of goods sold Tax benefit (1,753 ) Net unrealized loss on derivative instruments, net of tax $ 2,991 Defined benefit pension costs: Prior service costs and deferrals $ 421 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (129 ) Net periodic benefit cost, net of tax $ 292 The following table presents reclassifications from AOCI during the nine months ended January 1, 2017 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in Cash Flow Hedging Relationships: Net unrealized gain on derivative instruments $ (2,481 ) Cost of goods sold Tax expense 915 Net unrealized gain on derivative instruments, net of tax $ (1,566 ) Defined benefit pension costs: Prior service costs and deferrals $ 1,096 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (349 ) Net periodic benefit cost, net of tax $ 747 The following table presents reclassifications from AOCI during the nine months ended December 27, 2015 : Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in Cash Flow Hedging Relationships: Net unrealized loss on derivative instruments $ 3,806 Cost of goods sold Tax benefit (1,404 ) Net unrealized loss on derivative instruments, net of tax $ 2,402 Defined benefit pension costs: Prior service costs and deferrals $ 1,316 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (386 ) Net periodic benefit cost, net of tax $ 930 January 1, 2017 and March 31, 2016 , are as follows: March 31, 2016 Before Reclassifications Amounts Reclassified from AOCI January 1, 2017 Pension funded status adjustment $ (21,861 ) $ — $ 747 $ (21,114 ) Net unrealized gain (loss) on derivative instruments 388 1,977 (1,566 ) 799 Foreign currency translation adjustment (75,876 ) (74,516 ) — (150,392 ) Accumulated other comprehensive income (loss) $ (97,349 ) $ (72,539 ) $ (819 ) $ (170,707 )
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 nine months ended January 1, 2017 : Equity Attributable to EnerSys Stockholders Nonredeemable Noncontrolling Interests Total Equity Balance as of March 31, 2016 $ 1,013,131 $ 5,304 $ 1,018,435 Total comprehensive income (loss): Net earnings 126,444 84 126,528 Net unrealized gain on derivative instruments, net of tax 411 — 411 Pension funded status adjustment, net of tax 747 — 747 Foreign currency translation adjustment (74,516 ) (465 ) (74,981 ) Total other comprehensive loss, net of tax (73,358 ) (465 ) (73,823 ) Total comprehensive income (loss) 53,086 (381 ) 52,705 Other changes in equity: Cash dividends - common stock ($0.525 per share) (22,800 ) — (22,800 ) Other, including activity related to equity awards 11,143 — 11,143 Balance as of January 1, 2017 $ 1,054,560 $ 4,923 $ 1,059,483

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Jan. 01, 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 Nine months ended January 1, 2017 December 27, 2015 January 1, 2017 December 27, 2015 Net earnings attributable to EnerSys stockholders $ 36,235 $ 38,478 $ 126,444 $ 126,890 Weighted-average number of common shares outstanding: Basic 43,429,525 44,394,925 43,375,474 44,524,289 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 620,149 581,279 567,536 650,529 3.375% Convertible Notes due 2038 (1) — — — 737,841 Diluted weighted-average number of common shares outstanding 44,049,674 44,976,204 43,943,010 45,912,659 Basic earnings per common share attributable to EnerSys stockholders $ 0.83 $ 0.87 $ 2.92 $ 2.85 Diluted earnings per common share attributable to EnerSys stockholders $ 0.82 $ 0.86 $ 2.88 $ 2.76 Anti-dilutive equity awards not included in diluted weighted-average common shares 62,470 — 232,542 —

Business Segments Business Segm

Business Segments Business Segments (Tables)	9 Months Ended
	Jan. 01, 2017
Segment Reporting [Abstract]
Selected Financial Data for Reportable Business Segments and Product Lines	: Quarter ended Nine months ended January 1, 2017 December 27, 2015 January 1, 2017 December 27, 2015 Net sales by segment to unaffiliated customers Americas $ 313,972 $ 306,331 $ 968,516 $ 945,839 EMEA 186,069 196,829 563,765 582,896 Asia 63,656 70,413 208,067 176,040 Total net sales $ 563,697 $ 573,573 $ 1,740,348 $ 1,704,775 Net sales by product line Reserve power $ 271,291 $ 271,948 $ 844,781 $ 810,448 Motive power 292,406 301,625 895,567 894,327 Total net sales $ 563,697 $ 573,573 $ 1,740,348 $ 1,704,775 Intersegment sales Americas $ 6,319 $ 6,334 $ 19,304 $ 23,041 EMEA 22,086 17,537 66,186 59,999 Asia 6,285 8,205 18,070 20,937 Total intersegment sales (1) $ 34,690 $ 32,076 $ 103,560 $ 103,977 Operating earnings by segment Americas $ 45,949 $ 40,572 $ 139,149 $ 134,344 EMEA 20,435 16,525 57,268 54,218 Asia 3,984 1,568 11,741 1,388 Restructuring charges - Americas — (865 ) (892 ) (1,435 ) Inventory adjustment relating to exit activities - EMEA 502 — (2,157 ) — Restructuring and other exit credits (charges) - EMEA 1,153 (2,153 ) (3,663 ) (4,706 ) Restructuring charges - Asia — (186 ) (482 ) (910 ) Reversal of legal accrual, net of fees - Americas — — — 799 Legal proceedings charge - EMEA (17,000 ) — (17,000 ) (4,000 ) Gain on sale of facility - Asia — — — 4,348 Total operating earnings (2) $ 55,023 $ 55,461 $ 183,964 $ 184,046 (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) $ in Thousands	9 Months Ended
	Jan. 01, 2017USD ($)
Basis of Presentation [Abstract]
Excess tax benefits	$ 780

Inventories - (Details)

Inventories - (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Mar. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 93,354	$ 84,198
Work-in-process	113,220	104,085
Finished goods	163,622	142,798
Total	$ 370,196	$ 331,081

Fair Value of Financial Instr34

Fair Value of Financial Instruments - Financial Assets and (Liabilities) (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Mar. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ (3,010)	$ (1,487)
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value		(1,487)
Lead hedge forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(3,015)	(499)
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	(3,015)	(499)
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	5	(988)
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	$ 5	$ (988)

Fair Value of Financial Instr35

Fair Value of Financial Instruments - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Mar. 31, 2016
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	$ 5	$ 0
Notes	300,000	300,000
Derivative liability	3,015	1,487
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	5	0
Notes	303,000	288,000
Derivative liability	$ 3,015	$ 1,487

Fair Value of Financial Instr36

Fair Value of Financial Instruments - (Additional Information) (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Mar. 31, 2016	Apr. 23, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Convertible Notes, Face Value Of Trade, Percentage	101.00%	96.00%
Senior Unsecured Five Point Zero Percentage Convertible Notes Due Two Thousand And Twenty Eight [Member]
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	Jan. 01, 2017	Mar. 31, 2016
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	$ 200	$ 0
Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	3,015	849
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	0	0
Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	195	638
Foreign currency forward contracts | Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	200	0
Foreign currency forward contracts | Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	0	350
Foreign currency forward contracts | Not Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	0	0
Foreign currency forward contracts | Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	195	638
Lead hedge forward contracts | Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	3,015	499
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		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (1,431)	$ 4,744	$ (2,481)	$ 3,806
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(1,767)	1,634	3,131	(6,054)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	1,431	(4,744)	2,481	(3,806)
Designated as Hedging Instrument | Lead hedge forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	(2,362)	1,109	2,258	(4,006)
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)	1,524	(4,448)	2,800	(7,461)
Designated as Hedging Instrument | Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	595	525	873	(2,048)
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)	$ (93)	$ (296)	$ (319)	$ 3,655

Derivative Financial Instrume39

Derivative Financial Instruments - Derivatives Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (25)	$ 175	$ (202)	$ (119)
Foreign currency forward contracts | Other Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (25)	$ 175	$ (202)	$ (119)

- Derivative Financial Instrume

- Derivative Financial Instruments (Additional Information) (Details) $ in Thousands, lb in Millions	3 Months Ended		9 Months Ended
	Jan. 01, 2017USD ($)lb	Dec. 27, 2015USD ($)	Jan. 01, 2017USD ($)lb	Dec. 27, 2015USD ($)	Mar. 31, 2016USD ($)lb
Derivatives, Fair Value [Line Items]
Recorded expense in the consolidated condensed statements of income	$ 1,247	$ (1,142)	$ 496	$ (2,573)
Cost of Sales
Derivatives, Fair Value [Line Items]
Foreign Currency Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months	1,217		1,217
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	24,868		24,868		$ 18,206
Foreign currency forward contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount	$ 15,948		$ 15,948		$ 11,156
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Notional amount in pounds | lb	34.5		34.5		27.4
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		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Disclosure Income Taxes Additional Information [Abstract]
Effective income tax rates	26.70%	22.00%	25.70%	23.60%
Tax rate reconciliation, legal expense, amount			$ 17,000,000
Deferred Income Tax Expense (Benefit)			(683,000)	$ (3,248,000)
Income (Loss) from Continuing Operations before Income Taxes, Foreign			$ 0.60	$ 0.51
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent			15.90%	10.10%
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		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Disclosure Analysis Of Changes In Liability For Product Warranties [Abstract]
Balance at beginning of period	$ 48,112	$ 40,140	$ 48,422	$ 39,810
Current period provisions	4,085	5,756	14,932	14,339
Costs incurred	(4,250)	(4,422)	(12,492)	(12,930)
Foreign exchange and other	(1,720)	(427)	(4,635)	(172)
Balance at end of period	$ 46,227	$ 41,047	$ 46,227	$ 41,047

Commitments, Contingencies an43

Commitments, Contingencies and Litigation - (Additional Information) (Details) $ in Thousands, lb in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2016USD ($)lb	Jan. 01, 2017USD ($)lb	Mar. 31, 2015USD ($)
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations	$ 1,962
Reserves for anti-competition investigations		$ 18,804
Provision For Environmental Liabilities			$ 1,123
Foreign currency forward contracts
Commitments, Contingencies And Litigation [Line Items]
Purchase price of hedges	$ 29,362	$ 40,816
Lead hedge forward contracts
Commitments, Contingencies And Litigation [Line Items]
Notional amount in pounds | lb	27.4	34.5
Purchase price of hedges	$ 21,628	$ 34,420
Belgium Anti-Competition Proceeding [Member]
Commitments, Contingencies And Litigation [Line Items]
Reserves for anti-competition investigations	$ 2,038	1,804
Germany Anti-competition Proceedings [Member]
Commitments, Contingencies And Litigation [Line Items]
Loss contingency accrual, provision for loss		17,000
Germany Anti-competition Proceedings [Member] | Minimum
Commitments, Contingencies And Litigation [Line Items]
Estimate of possible loss		17,000
Germany Anti-competition Proceedings [Member] | Maximum
Commitments, Contingencies And Litigation [Line Items]
Estimate of possible loss		$ 26,000

Restructuring Plans - Roll-forw

Restructuring Plans - Roll-forward of Restructuring Reserve (Details) $ in Thousands	9 Months Ended
	Jan. 01, 2017USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 2,989
Accrued	3,185
Costs incurred	(4,295)
Foreign currency impact and other	(146)
Restructuring reserve, ending balance	1,733
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	2,964
Accrued	2,417
Costs incurred	(3,749)
Foreign currency impact and other	(133)
Restructuring reserve, ending balance	1,499
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	25
Accrued	768
Costs incurred	(546)
Foreign currency impact and other	(13)
Restructuring reserve, ending balance	$ 234

Restructuring Plans - (Addition

Restructuring Plans - (Additional Information) (Details)	3 Months Ended				9 Months Ended		12 Months Ended
	Jan. 01, 2017USD ($)Employee	Jul. 03, 2016USD ($)Employee	Mar. 31, 2016USD ($)	Dec. 27, 2015USD ($)Employee	Jan. 01, 2017USD ($)Employee	Dec. 27, 2015USD ($)	Mar. 31, 2016USD ($)
Restructuring Cost and Reserve [Line Items]
Charges related to restructuring plan					$ 3,185,000
Restructuring reserve	$ 1,733,000		$ 2,989,000		1,733,000		$ 2,989,000
Restructuring and other exit (credits)	(1,153,000)			$ 3,204,000	5,037,000	$ 7,051,000	305,000
Restructuring charges					4,295,000
Non-cash restructuring charges					(1,435,000)	$ (398,000)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Charges related to restructuring plan					2,417,000
Restructuring reserve	1,499,000		2,964,000		1,499,000		2,964,000
Restructuring charges					$ 3,749,000
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in Cleveland, Ohio [Member]
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees | Employee					100
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in Cleveland, Ohio [Member] | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					$ 1,023,000
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in Cleveland, Ohio [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash restructuring charges					(2,379,000)
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in Cleveland, Ohio [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					1,043,000
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in Cleveland, Ohio [Member] | Pension Curtailment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					313,000
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in the Americas [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 924,000					119,000
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in the Americas [Member] | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					718,000		313,000
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in the Americas [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					174,000
Americas | Restructuring Related to Improving the Efficiency of Manufacturing Operations in the Americas [Member] | Pension Curtailment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)							1,488,000
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			$ 2,993,000		2,671,000
Restructuring reserve	435,000				435,000
Restructuring and other exit (credits)	942,000						$ 5,232,000
Expected additional restructuring charges	$ 300,000				300,000
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				$ (6,500,000)
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	$ 1,298,000				1,298,000
Restructuring and other exit (credits)					1,586,000
Restructuring charges					217,000
Non-cash restructuring charges	(4,500,000)	$ (4,500,000)
Expected additional restructuring charges	2,900,000				2,900,000
Asia | Restructurings Related To Manufacturing Facility in Jiangdu [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	0				0
Restructuring and other exit (credits)					483,000
Restructuring charges					483,000
Expected additional restructuring charges	$ 100,000				100,000
Asia | Restructurings Related To Manufacturing Facility in Jiangdu [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash restructuring charges		$ (600,000)
South Africa Joint Venture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					3,303,000
South Africa Joint Venture [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges					2,586,000
Non-cash restructuring charges					(717,000)
South Africa Joint Venture [Member] | Inventory Write-Off [Member]
Restructuring Cost and Reserve [Line Items]
Non-cash restructuring charges					(2,157,000)
South Africa Joint Venture [Member] | Change in Estimate of Contract losses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					1,099,000
South Africa Joint Venture [Member] | Deconsolidation of Joint Venture [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					$ (341,000)

Debt - Long-term Debt Including

Debt - Long-term Debt Including Capital Lease Obligations (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Mar. 31, 2016	Apr. 23, 2015
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 605,800	$ 612,500
Unamortized Debt Issuance Expense	5,238	6,279
Long-term Debt, Excluding Current Maturities	600,562	606,221
Senior Unsecured Five Point Zero Percentage Convertible Notes Due Two Thousand And Twenty Eight [Member]
Debt Instrument [Line Items]
Long-term debt	300,000	300,000	$ 300,000
Unamortized Debt Issuance Expense	3,902	4,370
Secured Debt | Incremental Commitment Agreement | 2011 Credit Facility due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment	305,800	312,500
Unamortized Debt Issuance Expense	1,336	$ 1,909
Secured Debt | Incremental Commitment Agreement
Debt Instrument [Line Items]
Long-term debt	174,550
Secured Debt | Secured Debt | Incremental Commitment Agreement | 2011 Credit Facility due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment	$ 131,250

Debt - (Additional Information)

Debt - (Additional Information) (Details) - USD ($)	Jul. 17, 2015	Jul. 08, 2014	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015	Mar. 31, 2015	Mar. 31, 2016	Apr. 23, 2015
Debt Instrument [Line Items]
Payment of principal and accreted interest on Convertible Notes	$ 172,388,000				$ 0	$ 172,266,000
Number of shares issued from conversion	1,889,431
Short-term debt			$ 35,879,000		$ 35,879,000			$ 22,144,000
Short-term Debt, Weighted Average Interest Rate			7.00%		7.00%
Company Owned Capital Stock Percentage Securing Senior Secured Credit Facility							65.00%
Payments of Financing Costs					$ 0	4,986,000
Amortization of Other Deferred Charges			$ 347,000	$ 343,000	1,041,000	$ 1,117,000
Deferred Finance Costs, Net			5,238,000		5,238,000			6,279,000
Senior Unsecured Five Point Zero Percentage Convertible Notes Due Two Thousand And Twenty Eight [Member]
Debt Instrument [Line Items]
Long-term debt			$ 300,000,000		$ 300,000,000			$ 300,000,000	$ 300,000,000
Debt Instrument Interest Rate			5.00%		5.00%			5.00%
Convertible Notes Payable
Debt Instrument [Line Items]
Available lines of credit			$ 451,267,000		$ 451,267,000			$ 472,187,000
Outstanding amount			127,742,000		127,742,000			144,112,000
Stand by letters of credit			4,001,000		4,001,000			2,693,000
Incremental Commitment Agreement | Secured Debt | 2011 Credit Facility due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment			305,800,000		305,800,000			312,500,000
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 | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity		500,000,000
Incremental Commitment Agreement | Secured Debt
Debt Instrument [Line Items]
Long-term debt			174,550,000		174,550,000
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
Line of Credit Facility, Maximum Borrowing Capacity		$ 150,000,000
Incremental Commitment Agreement | Secured Debt | Secured Debt | 2011 Credit Facility due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment			$ 131,250,000		$ 131,250,000
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, 2014 through June 30, 2016 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment		$ 1,875,000
Debt Instrument Quarterly Installments Beginning June 30, 2016 through September 30, 2018 [Member]
Debt Instrument [Line Items]
Debt Instrument, Periodic Payment		3,750,000
Debt Instrument Final Installments Payable on September 30, 2018 [Member]
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		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 96	$ 118	$ 278	$ 364
Interest cost	158	172	498	510
Expected return on plan assets	(204)	(213)	(612)	(643)
Amortization and deferral	76	111	340	370
Curtailment loss	0	313	0	313
Net periodic benefit cost	126	501	504	914
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	212	201	658	617
Interest cost	441	476	1,402	1,447
Expected return on plan assets	(442)	(563)	(1,424)	(1,715)
Amortization and deferral	238	310	756	946
Curtailment loss	0	0	0	0
Net periodic benefit cost	$ 449	$ 424	$ 1,392	$ 1,295

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	3,177,477		3,177,477
Equity-based compensation expense	$ 4,699	$ 4,545	$ 14,556	$ 14,883
Stock options granted			242,068,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			263,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period			83,720,000
Vesting period			3 years
Vested restricted stock and restricted stock units			232,817,000
Stock option grants outstanding	448,567,000		448,567,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and restricted stock units			143,043,000
Stock option grants outstanding	612,626,000		612,626,000
Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding	451,668,000		451,668,000
Management | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period			235,358,000
Percentage of restricted stock units granted, vested per year			25.00%
Vesting period			4 years
Non-employee Directors [Member] | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period			25,230,000

Stockholders' Equity - Change i

Stockholders' Equity - Change in the Number of Shares of Common Stock Outstanding (Details) - shares	Jul. 17, 2015	Jan. 01, 2017
Class of Stock [Line Items]
Shares outstanding, beginning balance		43,189,502
Debt Conversion, Converted Instrument, Shares Issued	1,889,431
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes		240,627
Shares outstanding, ending balance		43,430,129

Stockholders' Equity - Componen

Stockholders' Equity - Components of Accumulated Other Comprehensive Income (Details) $ in Thousands	9 Months Ended
	Jan. 01, 2017USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	$ 1,018,435
Ending balance	1,059,483
Pension funded status adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	21,861
Before Reclassifications	0
Amounts Reclassified from AOCI	(747)
Ending balance	21,114
Net unrealized gain (loss) on derivative instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	388
Before Reclassifications	(1,977)
Amounts Reclassified from AOCI	(1,566)
Ending balance	799
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(75,876)
Before Reclassifications	74,516
Amounts Reclassified from AOCI	0
Ending balance	(150,392)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(97,349)
Before Reclassifications	(72,539)
Amounts Reclassified from AOCI	(819)
Ending balance	$ (170,707)

Stockholders' Equity - Reclassi

Stockholders' Equity - Reclassifications from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Equity [Abstract]
Net unrealized (gain) on derivative instruments	$ (1,431)	$ 4,744	$ (2,481)	$ 3,806
Unrealized gain (loss) on derivative instruments, Tax Benefit (Expense)	528	(1,753)	915	(1,404)
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount	(903)	2,991	(1,566)	2,402
Pension funded status adjustment, Before-Tax Amount	314	421	1,096	1,316
Pension funded status adjustment, Tax Benefit (Expense)	116	129	349	386
Net periodic benefit cost, net of tax	$ 198	$ 292	$ 747	$ 930

Stockholders' Equity - Noncontr

Stockholders' Equity - Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 5,304
Net earnings attributable to noncontrolling interests	$ (860)	$ 264	1,937	$ 974
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount	(903)	2,991	(1,566)	2,402
Amount reclassified out of AOCI, net of tax	198	292	747	930
Total other comprehensive loss, net of tax	(54,573)	(8,786)	(73,764)	(21,240)
Total comprehensive (loss) income	(17,478)	$ 29,428	50,743	104,676
Dividends paid to stockholders			(22,800)	(23,322)
Option proceeds			5	$ 139
Ending balance	$ 4,923		$ 4,923
Dividends declared (in dollars per share)	$ 0.175	$ 0.175	$ 0.525	$ 0.525
Equity Attributable to EnerSys Stockholders
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 1,013,131
Net earnings attributable to noncontrolling interests			126,444
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount			411
Amount reclassified out of AOCI, net of tax			747
Foreign currency translation adjustment, Net-of Tax Amount			(74,516)
Total other comprehensive loss, net of tax			(73,358)
Total comprehensive (loss) income			53,086
Dividends paid to stockholders			(22,800)
Option proceeds			11,143
Ending balance	$ 1,054,560		1,054,560
Nonredeemable Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			5,304
Net earnings attributable to noncontrolling interests			84
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount			0
Amount reclassified out of AOCI, net of tax			0
Foreign currency translation adjustment, Net-of Tax Amount			(465)
Total other comprehensive loss, net of tax			(465)
Total comprehensive (loss) income			(381)
Dividends paid to stockholders			0
Option proceeds			0
Ending balance	4,923		4,923
Total Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,018,435
Net earnings attributable to noncontrolling interests			126,528
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount			411
Amount reclassified out of AOCI, net of tax			747
Foreign currency translation adjustment, Net-of Tax Amount			(74,981)
Total other comprehensive loss, net of tax			(73,823)
Total comprehensive (loss) income			52,705
Dividends paid to stockholders			(22,800)
Option proceeds			11,143
Ending balance	$ 1,059,483		$ 1,059,483

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - shares	Jul. 17, 2015	Jan. 01, 2017	Mar. 31, 2016
Class of Stock [Line Items]
Debt Conversion, Converted Instrument, Shares Issued	1,889,431
Treasury stock, shares		10,923,274	10,923,274

Stockholders' Equity - Redeemab

Stockholders' Equity - Redeemable Noncontrolling Interests (Details) $ in Thousands	9 Months Ended
	Jan. 01, 2017USD ($)
Noncontrolling Interest [Abstract]
Beginning balance, redeemable noncontrolling interests	$ 5,997
Net losses attributable to noncontrolling interests	(2,021)
Deconsolidation of joint venture	(4,035)
Foreign currency translation adjustment	59
Ending balance, redeemable noncontrolling interests	$ 0

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		9 Months Ended
	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 36,235	$ 38,478	$ 126,444	$ 126,890
Basic	43,429,525	44,394,925	43,375,474	44,524,289
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired	620,149	581,279	567,536	650,529
3.375% Convertible Notes due 2038	0	0	0	737,841
Diluted weighted-average number of common shares outstanding	44,049,674	44,976,204	43,943,010	45,912,659
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.83	$ 0.87	$ 2.92	$ 2.85
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.82	$ 0.86	$ 2.88	$ 2.76
Anti-dilutive equity awards not included in diluted weighted-average common shares	62,470	0	232,542	0

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Details) - USD ($) $ in Thousands	Jul. 17, 2015	Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Debt Instrument [Line Items]
Incremental Common Shares Attributable to Conversion of Debt Securities		0	0	0	737,841
Payment of principal and accreted interest on Convertible Notes	$ 172,388			$ 0	$ 172,266
Number of shares issued from conversion	1,889,431

Business Segments - (Details)

Business Segments - (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 01, 2017USD ($)	Dec. 27, 2015USD ($)	Jan. 01, 2017USD ($)segment	Dec. 27, 2015USD ($)	Mar. 31, 2016USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment			3
Total net sales	$ 563,697	$ 573,573	$ 1,740,348	$ 1,704,775
Net sales revenue by services	563,697	573,573	1,740,348	1,704,775
Total intersegment sales	34,690	32,076	103,560	103,977
Total operating earnings	55,023	55,461	183,964	184,046
Restructuring charges	1,153	(3,204)	(5,037)	(7,051)	$ (305)
Inventory write-off relating to exit activities - See Note 8	502	0	(2,157)	0
Gain (Loss) Related to Litigation Settlement			(17,000)	799
Litigation Settlement, Amount	(17,000)	0	(17,000)	(3,201)
Gain on sale of facility			0	4,348
Reserve Power
Segment Reporting Information [Line Items]
Net sales revenue by services	271,291	271,948	844,781	810,448
Motive Power
Segment Reporting Information [Line Items]
Net sales revenue by services	292,406	301,625	895,567	894,327
Americas
Segment Reporting Information [Line Items]
Total net sales	313,972	306,331	968,516	945,839
Total intersegment sales	6,319	6,334	19,304	23,041
Total operating earnings	45,949	40,572	139,149	134,344
Restructuring charges	0	(865)	(892)	(1,435)
Gain (Loss) Related to Litigation Settlement	0	0	0	799
Europe
Segment Reporting Information [Line Items]
Total net sales	186,069	196,829	563,765	582,896
Total intersegment sales	22,086	17,537	66,186	59,999
Total operating earnings	20,435	16,525	57,268	54,218
Restructuring charges	1,153	(2,153)	(3,663)	(4,706)
Inventory write-off relating to exit activities - See Note 8	502	0	(2,157)	0
Litigation Settlement, Amount	(17,000)	0	(17,000)	(4,000)
Asia
Segment Reporting Information [Line Items]
Total net sales	63,656	70,413	208,067	176,040
Total intersegment sales	6,285	8,205	18,070	20,937
Total operating earnings	3,984	1,568	11,741	1,388
Restructuring charges	0	(186)	(482)	(910)
Gain on sale of facility	$ 0	$ 0	$ 0	$ 4,348

Subsequent Events - (Details)

Subsequent Events - (Details)	Feb. 08, 2017$ / shares
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.175

Uncategorized Items - ens-10120

Label	Element	Value
Noncash Project Abandonment Costs	us-gaap_NoncashProjectAbandonmentCosts	$ 0