EnerSys (ENS) 10-Q 28 Jan 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Dec. 27, 2015	Jan. 22, 2016
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 27, 2015
Document Fiscal Year Focus	2,016
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		43,434,816

Consolidated Condensed Balance

Consolidated Condensed Balance Sheets - USD ($)	Dec. 27, 2015	Mar. 31, 2015
Current assets:
Cash and cash equivalents	$ 346,117,000	$ 268,921,000
Accounts receivable, net of allowance for doubtful accounts: June 28, 2015 - $8,005; March 31, 2015 - $7,562	463,220,000	518,165,000
Total	341,170,000	337,011,000
Deferred taxes	30,558,000	31,749,000
Prepaid and other current assets	134,372,000	77,572,000
Total current assets	1,315,437,000	1,233,418,000
Property, plant, and equipment, net	357,496,000	356,854,000
Goodwill	382,949,000	369,730,000
Other intangible assets, net	162,623,000	158,160,000
Other assets	45,473,000	42,173,000
Total assets	2,263,978,000	2,160,335,000
Current liabilities:
Short-term debt	23,503,000	19,715,000
Accounts payable	214,273,000	218,574,000
Accrued expenses	200,787,000	195,082,000
Total current liabilities	438,563,000	433,371,000
Long-term Debt, Excluding Current Maturities	626,669,000	493,224,000
Deferred taxes	70,428,000	99,398,000
Other liabilities	81,081,000	81,616,000
Total liabilities	$ 1,216,741,000	$ 1,107,609,000
Commitments and contingencies
Redeemable noncontrolling interests	$ 4,824,000	$ 6,956,000
Redeemable equity component of Convertible Notes	0	1,330,000
Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at June 28, 2015 and at March 31, 2015	0	0
Common Stock, $0.01 par value per share, 135,000,000 shares authorized; 54,093,992 shares issued and 44,488,045 shares outstanding at June 28, 2015; 53,664,639 shares issued and 44,068,588 shares outstanding at March 31, 2015	541,000	537,000
Additional paid-in capital	435,286,000	525,967,000
Treasury stock, at cost, 9,605,947 shares held as of June 28, 2015; 9,596,051 shares held as of March 31, 2015	(370,293,000)	(376,005,000)
Retained earnings	1,100,396,000	997,376,000
Accumulated other comprehensive income	(128,790,000)	(108,975,000)
Total EnerSys stockholders' equity	1,037,140,000	1,038,900,000
Noncontrolling interests	5,273,000	5,540,000
Total equity	1,042,413,000	1,044,440,000
Total liabilities and equity	$ 2,263,978,000	$ 2,160,335,000

Consolidated Condensed Balance3

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 27, 2015	Mar. 31, 2015
Accounts receivable, allowance for doubtful accounts	$ 10,123	$ 7,562
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 301
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	54,112,776	53,664,639
Common stock, shares outstanding	44,396,260	44,068,588
Treasury stock, shares	9,716,516	9,596,051

Consolidated Condensed Statemen

Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Income Statement [Abstract]
Net sales	$ 573,573	$ 611,578	$ 1,704,775	$ 1,875,615
Cost of goods sold	427,691	454,313	1,253,539	1,393,233
Gross profit	145,882	157,265	451,236	482,382
Operating expenses	87,217	86,145	261,286	272,114
Restructuring charges	3,204	2,437	7,051	6,076
Litigation Settlement, Amount			3,201	(16,233)
Gain on sale of facility			4,348	0
Operating earnings	55,461	68,683	184,046	220,425
Interest expense	5,329	4,947	16,696	14,192
Other (income) expense, net	1,142	(866)	2,573	(3,244)
Earnings before income taxes	48,990	64,602	164,777	209,477
Income tax expense	10,776	15,271	38,861	54,481
Net earnings	38,214	49,331	125,916	154,996
Net losses attributable to noncontrolling interests	(264)	79	(974)	259
Net earnings attributable to EnerSys stockholders	$ 38,478	$ 49,252	$ 126,890	$ 154,737
Net earnings per common share attributable to EnerSys stockholders:
Basic earnings per common share attributable to EnerSys stockholders	$ 0.87	$ 1.09	$ 2.85	$ 3.36
Diluted earnings per common share attributable to EnerSys stockholders	0.86	1.04	2.76	3.19
Dividends per common share	$ 0.175	$ 0.175	$ 0.53	$ 0.53
Weighted average shares of common stock outstanding:
Basic	44,394,925	45,188,942	44,524,289	46,073,961
Diluted	44,976,204	47,368,173	45,912,659	48,543,896

Consolidated Condensed Stateme5

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Net earnings	$ 38,214	$ 49,331	$ 125,916	$ 154,996
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments, net of tax	4,021	(5,268)	(1,416)	(2,701)
Pension funded status adjustment, net of tax	292	155	930	521
Foreign currency translation adjustments	(13,099)	(42,925)	(20,754)	(95,940)
Total other comprehensive (loss) income, net of tax	(8,786)	(48,038)	(21,240)	(98,120)
Total comprehensive income	29,428	1,293	104,676	56,876
Comprehensive loss attributable to noncontrolling interests	(823)	(286)	(2,399)	(735)
Comprehensive income attributable to EnerSys stockholders	$ 30,251	$ 1,579	$ 107,075	$ 57,611

Consolidated Condensed Stateme6

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014
Cash flows from operating activities
Net earnings	$ 125,916	$ 154,996
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	41,915	42,124
Restructuring Costs	398	644
Derivatives not designated in hedging relationships:
Net (gains) losses	119	(132)
Cash settlements	386	461
Provision for doubtful accounts	3,169	609
Deferred income taxes	(3,248)	21,951
Non-cash interest expense	2,447	7,078
Stock-based compensation	14,883	21,339
Gain on disposal of property, plant, and equipment	(4,348)	0
Gain (Loss) Related to Litigation Settlement	(799)	(16,233)
Gain (Loss) on Sale of Assets and Asset Impairment Charges		(2,000)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	53,969	23,556
Inventory	(5,705)	(52,050)
Prepaid expenses and other current assets	1,646	(5,857)
Other assets	(1,201)	(168)
Accounts payable	(1,244)	(9,056)
Accrued expenses	2,498	(65,547)
Other liabilities	1,922	11,277
Net cash provided by operating activities	232,715	132,913
Cash flows from investing activities
Capital expenditures	(45,695)	(47,184)
Purchase of a business	(39,079)
Payments for (Proceeds from) Other Investing Activities		2,000
Net cash used in investing activities	(74,729)	(45,007)
Cash flows from financing activities
Net increase in short-term debt	5,535	(17,824)
Proceeds from revolving credit borrowings	300,000	337,700
Repayments of revolving credit borrowings	(288,000)	(282,700)
Proceeds from long-term debt	300,000	150,000
Repurchase of Convertible Notes	172,266	234
Repayments of Long-term Debt	(3,750)
Deferred financing costs	(4,986)	(1,076)
Taxes paid related to net share settlement of equity awards, net of option proceeds	(15,209)	(12,656)
Excess tax benefits from exercise of stock options and vesting of equity awards	4,175	3,341
Purchase of treasury stock	(120,637)	(176,028)
Prepayments for Accelerated Share Repurchase	(60,000)
Dividends paid to stockholders	(23,322)	(24,021)
Other	(106)	(183)
Net cash used in financing activities	(78,566)	(23,681)
Effect of exchange rate changes on cash and cash equivalents	(2,224)	(24,345)
Net increase in cash and cash equivalents	77,196	39,880
Cash and cash equivalents at beginning of period	268,921	240,103
Cash and cash equivalents at end of period	346,117	279,983
Manufacturing Facility
Derivatives not designated in hedging relationships:
Gain on disposal of property, plant, and equipment	(4,348)
Cash flows from investing activities
Proceeds from disposal of property, plant, and equipment	(9,179)
Property, Plant, and Equipment Excluding Manufacturing Facility [Member]
Derivatives not designated in hedging relationships:
Gain on disposal of property, plant, and equipment	(8)	(79)
Cash flows from investing activities
Proceeds from disposal of property, plant, and equipment	$ 866	$ 177

Basis of Presentation

Basis of Presentation	9 Months Ended
	Dec. 27, 2015
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 2015 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on May 27, 2015 (the "2015 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 2016 end on June 28, 2015, September 27, 2015, December 27, 2015, and March 31, 2016, respectively. The four quarters in fiscal 2015 ended on June 29, 2014, September 28, 2014, December 28, 2014, and March 31, 2015, 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, and the amount presented in temporary equity is not less than the initial amount reported in temporary equity. 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 Company is currently evaluating the impact, if any, of the adoption of this newly issued guidance on its consolidated financial statements. In April 2015, the FASB issued ASU 2015-03, “Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs.” The update simplifies the presentation of debt issuance costs by requiring that debt issuance costs be presented in the balance sheet as a direct deduction from the carrying amount of debt liability, consistent with debt discounts or premiums. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this update and amortization of the costs will continue to be reported as interest expense. For public companies, this update is effective for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years, and is to be applied retrospectively. Early adoption of this revised guidance is permitted for financial statements that have not been previously issued. The Company has elected to early adopt the revised guidance for its current quarter ended December 27, 2015 and as such debt issuance costs are now presented as a direct reduction of long-term debt on the Company’s condensed consolidated balance sheets, as further reflected in Note 9. In July 2015, the FASB issued ASU 2015-011, “Simplifying the Measurement of Inventory (Topic 330).” This update requires inventory to be measured at the lower of cost or net realizable value. Net realizable value is the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal and transportation. Subsequent measurement is unchanged for inventory measured using LIFO or the retail inventory method. This update will be effective for the Company for all annual and interim periods beginning after December 15, 2016. The amendments in this update should be applied prospectively with earlier application permitted as of the beginning of an interim or annual reporting period. This update will not have a material impact on the Company's consolidated financial statements. In September 2015, the FASB issued ASU 2015-16, “Simplifying the Accounting for Measurement-Period Adjustments (Topic 805).” The amendments in this update require that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in this update require that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. In November 2015, the FASB issued ASU 2015-17, “Balance Sheet Classification of Deferred Taxes (Topic 740).” This update simplifies the presentation of deferred income taxes, by requiring that deferred tax liabilities and assets be classified as non-current in a classified statement of financial position. The current requirement that deferred tax liabilities and assets of a tax-paying component of an entity be offset and presented as a single amount is not affected by the amendments in this Update. The amendments in this update are effective for fiscal years beginning after December 15, 2016, and interim periods within those fiscal years. The Company is currently evaluating the impact, if any, of the adoption of this newly issued guidance on its consolidated financial statements.

Inventories

Inventories	9 Months Ended
	Dec. 27, 2015
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories, net consist of: December 27, 2015 March 31, 2015 Raw materials $ 91,308 $ 82,954 Work-in-process 104,371 106,196 Finished goods 145,491 147,861 Total $ 341,170 $ 337,011

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 and March 31, 2015 and the basis for that measurement: Total Fair Value Measurement December 27, 2015 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ 289 $ — $ 289 $ — Foreign currency forward contracts 264 — 264 — Total derivatives $ 553 $ — $ 553 $ — Total Fair Value Measurement March 31, 2015 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ (341 ) $ — $ (341 ) $ — Foreign currency forward contracts 4,155 — 4,155 — Total derivatives $ 3,814 $ — $ 3,814 $ — 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 2015 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 values of these Notes represent the trading values based upon quoted market prices and are classified as Level 2. The Notes were trading at approximately 100% of face value on December 27, 2015 . The carrying amounts and estimated fair values of the Company’s derivatives, Notes and Convertible Notes (as defined in Note 9) at December 27, 2015 and March 31, 2015 were as follows: December 27, 2015 March 31, 2015 Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Derivatives (1) $ 553 $ — $ 4,155 $ 4,155 Financial liabilities: Notes (2) $ 300,000 $ 300,000 (2) $ — $ — Convertible Notes (2) (3) — — 170,936 (3) 277,348 (2) Derivatives (1) — — 341 341 (1) Represents lead and foreign currency forward contracts. (2) The fair value amount of the Notes at December 27, 2015 and the Convertible Notes at March 31, 2015 represent the trading value of the instruments. (3) The carrying amount of the Convertible Notes at March 31, 2015 represent the $172,266 principal balance, less the unamortized debt discount (see Note 9 for further details). Non-recurring fair value measurements The valuation of goodwill and other intangible assets is based on information and assumptions available to the Company at the time of acquisition, using income and market approaches to determine fair value. The Company tests goodwill and other intangible assets annually for impairment, or when indications of potential impairment exist (see Note 1 to the Company's consolidated financial statements included in the Company's 2015 Annual Report for details). Goodwill is tested for impairment by determining the fair value of the Company’s reporting units. The unobservable inputs used to measure the fair value of the reporting units include projected growth rates, profitability, and the risk factor premium added to the discount rate. The remeasurement of goodwill is classified as a Level 3 fair value assessment due to the significance of unobservable inputs developed using company-specific information. The inputs used to measure the fair value of other intangible assets were largely unobservable and accordingly were also classified as Level 3. The fair value of indefinite-lived assets, such as trademarks, is based on the royalties saved that would have been paid to a third party had the Company not owned the trademark. The fair value of other intangible assets was estimated using the income approach, based on cash flow projections of revenue growth rates, taking into consideration industry and market conditions. During the nine months of fiscal 2016 , no assets or liabilities were recorded at fair value on a non-recurring basis.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 and March 31, 2015 were 44.2 million pounds and 91.6 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 December 27, 2015 and March 31, 2015 , the Company had entered into a total of $55,564 and $75,878 , respectively, of such contracts. In the coming twelve months, the Company anticipates that $2,407 of pretax loss relating to lead and foreign currency forward contracts will be reclassified from accumulated other comprehensive income (“AOCI”) as part of cost of goods sold. This amount represents the current net unrealized impact of hedging lead and foreign exchange rates, which will change as market rates change in the future, and will ultimately be realized in the Consolidated Condensed Statement of Income as an offset to the corresponding actual changes in lead costs to be realized in connection with the variable lead cost and foreign exchange rates being hedged. Derivatives not Designated in Hedging Relationships Foreign Currency Forward Contracts The Company also enters into foreign currency forward contracts to economically hedge foreign currency fluctuations on intercompany loans and foreign currency denominated receivables and payables. These are not designated as hedging instruments and changes in fair value of these instruments are recorded directly in the Consolidated Condensed Statements of Income. As of December 27, 2015 and March 31, 2015 , the notional amount of these contracts was $15,270 and $26,246 , 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 December 27, 2015 and March 31, 2015 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments December 27, 2015 March 31, 2015 December 27, 2015 March 31, 2015 Prepaid and other current assets Lead forward contracts $ 289 $ — $ — $ — Foreign currency forward contracts 350 3,735 — 420 Total assets $ 639 $ 3,735 $ — $ 420 Accrued expenses Lead forward contracts $ — $ 341 $ — $ — Foreign currency forward contracts — — 86 — Total liabilities $ — $ 341 $ 86 $ — 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 quarter ended December 28, 2014 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 $ (5,898 ) Cost of goods sold $ 1,554 Foreign currency forward contracts 32 Cost of goods sold 920 Total $ (5,866 ) $ 2,474 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 $ (232 ) Total $ (232 ) 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 ) The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the nine months ended December 28, 2014 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 $ (6,158 ) Cost of goods sold $ (121 ) Foreign currency forward contracts 2,756 Cost of goods sold 992 Total $ (3,402 ) $ 871 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 $ 132 Total $ 132

Income Taxes

Income Taxes	9 Months Ended
	Dec. 27, 2015
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 2016 and 2015 were based on the estimated effective tax rates applicable for the full years ending March 31, 2016 and March 31, 2015 , 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 22.0% and 23.6% , respectively, for the third quarters of fiscal 2016 and 2015 and 23.6% and 26.0% , respectively, for the nine months of fiscal 2016 and fiscal 2015 . The rate decrease in the third quarter of fiscal 2016 compared to the third quarter of fiscal 2015 is primarily due to the recognition in fiscal 2016 of a tax benefit related to international restructuring and changes in mix of earnings among tax jurisdictions. The rate decrease in the nine months of fiscal 2016 compared to the nine months of fiscal 2015 is primarily due to the recognition in fiscal 2016 of a tax benefit related to international restructuring, subsequent recognition of a domestic deferred tax asset related to executive compensation, and a previously unrecognized tax position related to one of the Company's foreign subsidiaries, as well as changes in the mix of earnings among tax jurisdictions. Foreign income as a percentage of worldwide income is estimated to be 51% for the nine months of fiscal 2016 compared to 56% for the nine months of fiscal 2015 . The foreign effective income tax rates for the nine months of fiscal 2016 and 2015 were 10.1% and 14.7% , respectively. The rate decrease compared to the prior year period is primarily due to the recognition in fiscal 2016 of a tax benefit related to international restructuring and subsequent recognition of a previously unrecognized tax position related to one of the Company's foreign subsidiaries, as well as 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
	Dec. 27, 2015
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. Because 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 December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Balance at beginning of period $ 40,140 $ 40,518 $ 39,810 $ 40,426 Current period provisions 5,756 4,083 14,339 13,700 Costs incurred (4,422 ) (3,706 ) (12,930 ) (12,171 ) Foreign currency translation adjustment (427 ) (612 ) (172 ) (1,672 ) Balance at end of period $ 41,047 $ 40,283 $ 41,047 $ 40,283

Commitments, Contingencies and

Commitments, Contingencies and Litigation	9 Months Ended
	Dec. 27, 2015
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, anti-competition, 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, certain European competition authorities, including Belgium and the Netherlands, relating to conduct and anticompetitive practices of certain industrial battery participants. The Company is responding to these inquiries and has reserved $4,000 in connection with these investigations and other related legal charges. For the Dutch regulatory proceeding, the Company does not believe that such an estimate can be made at this time given the early stages of its investigation. The foregoing estimate of losses is based upon currently available information for this proceeding. However, the precise scope, timing and time period at issue, as well as the final outcome of the investigations, remains 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 that amounted to $1,123 and $2,902 , respectively, as of December 27, 2015 and March 31, 2015 . Based on current information, the Company’s management believes these reserves are adequate to satisfy the Company’s environmental liabilities at this facility. This site is separate from the Company’s current metal fabrication facility in Sumter, South Carolina. 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 December 27, 2015 and March 31, 2015 , the Company has hedged the price to purchase 44.2 million pounds and 91.6 million pounds of lead, respectively, for a total purchase price of $34,072 and $76,143 , 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 $70,834 and $102,124 , respectively, of foreign currency forward contracts with financial institutions as of December 27, 2015 and March 31, 2015 .

Restructuring Plans

Restructuring Plans	9 Months Ended
	Dec. 27, 2015
Text Block [Abstract]
Restructuring Plans	Restructuring Plans During fiscal 2013, the Company announced a restructuring related to improving the efficiency of its manufacturing operations in EMEA. This program was completed during the second quarter of fiscal 2016 . Total charges for this program were $6,895 , primarily for cash expenses of $5,496 for employee severance-related payments of approximately 140 employees and non-cash expenses of $1,399 associated with the write-off of certain fixed assets and inventory. The Company incurred $5,207 of costs against the accrual through fiscal 2015 , and incurred $271 in costs against the accrual during the nine months of fiscal 2016 . During fiscal 2014 , the Company announced further restructuring programs to improve the efficiency of its manufacturing, sales and engineering operations in EMEA including the restructuring of its manufacturing operations in Bulgaria. The restructuring of the Bulgaria operations was announced during the third quarter of fiscal 2014 and consists of the transfer of motive power and a portion of reserve power battery manufacturing to the Company's facilities in Western Europe. The Company estimates that the total charges for all actions announced during fiscal 2014 will amount to approximately $22,800 , primarily from non-cash charges related to the write-off of fixed assets and inventory of $11,000 , along with cash charges for employee severance-related payments and other charges of $11,800 . The Company estimates that these actions will result in the reduction of approximately 500 employees upon completion. The Company recorded restructuring charges of $22,115 through fiscal 2015, consisting of non-cash charges of $10,934 and cash charges of $11,181 and recorded an additional $826 in cash charges and a favorable accrual adjustment of $316 during the nine months of fiscal 2016. The Company incurred $9,737 in costs against the accrual through fiscal 2015 and incurred an additional $914 against the accrual during the nine months of fiscal 2016 . As of December 27, 2015 , the reserve balance associated with these actions is $843 . The Company expects to be committed to an additional $100 of restructuring charges related to these actions in fiscal 2016 when it expects to complete the program. During the third quarter of fiscal 2015, the Company announced a restructuring related to its manufacturing facility located in Jiangdu, the People’s Republic of China ("PRC"), pursuant to which the Company completed the transfer of the manufacturing at that location to its other facilities in PRC, as part of the closure of the Jiangdu facility in the first quarter of fiscal 2016 . The Company estimates that the total charges for these actions will amount to approximately $5,400 primarily from cash charges for employee severance-related payments and other charges of $5,000 , along with non-cash charges related to the write off of fixed assets of $400 . The Company estimates that these actions will result in the reduction of approximately 300 employees upon completion. The Company recorded restructuring charges of $3,870 during fiscal 2015 consisting of cash charges for employee severance-related payments and recorded an additional $513 in cash charges and $398 in non-cash charges during the nine months of fiscal 2016 . The Company incurred $1,874 in costs against the accrual through fiscal 2015 and incurred an additional $2,509 against the accrual during the nine months of fiscal 2016 . As of December 27, 2015 , the reserve balance associated with these actions is $0 . The Company expects to be committed to an additional $700 of restructuring charges related to these actions in 2016 when it expects to complete the program. During fiscal 2015, the Company announced a restructuring primarily related to a portion of its sales and engineering organizations in Europe to improve efficiencies. The Company estimates that the total charges for these actions will amount to approximately $800 , primarily from cash charges for employee severance-related payments. The Company estimates that these actions will result in the reduction of approximately 10 employees upon completion in fiscal 2016 . In fiscal 2015, the Company recorded restructuring charges of $450 and recorded an additional $337 during the nine months of fiscal 2016 . The Company incurred $193 in costs against the accrual in fiscal 2015 and incurred an additional $377 against the accrual during the nine months of fiscal 2016 . As of December 27, 2015 , the reserve balance associated with these actions is $304 . The Company expects no additional restructuring charges related to these actions during fiscal 2016, and expects to complete the program during fiscal 2016 . During the first quarter of fiscal 2016, the Company completed a restructuring related to a reduction of two executives associated with one of Americas’ recent acquisitions to improve efficiencies. The Company recorded total severance-related charges of $570 , all of which was paid during the first quarter of fiscal 2016, primarily per the terms of a pre-existing employee agreement. 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 $6,600 , primarily from cash charges for employee severance-related payments and other charges. The Company estimates that these actions will result in the reduction of approximately 120 employees upon completion. During the nine months of fiscal 2016 , the Company recorded restructuring charges of $3,858 and incurred $1,607 in costs against the accrual. As of December 27, 2015 , the reserve balance associated with these actions is $2,230 . The Company expects to be committed to an additional $2,800 of restructuring charges related to these actions during fiscal 2016 , 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 consists of the announced closing of its Cleveland, Ohio charger manufacturing facility which is expected to be completed during the first quarter of fiscal 2017, with the transfer of production to other Americas manufacturing facilities. The Company estimates that the total charges for all actions associated with this program will amount to approximately $2,100 , primarily from cash charges for employee severance-related payments and other charges of $1,500 , along with a pension curtailment charge of $313 and non-cash charges related to the accelerated depreciation of fixed assets of $300 . The Company estimates that these actions will result in the reduction of approximately 100 employees at its Cleveland facility. During the nine months of fiscal 2016 , the Company recorded restructuring charges of $865 including a pension curtailment charge of $313 . As of December 27, 2015 , the reserve balance associated with these actions is $552 . The Company expects to be committed to an additional $1,100 of restructuring charges related to these actions during fiscal 2016 and fiscal 2017, and expects to complete the program during fiscal 2017. A roll-forward of the restructuring reserve is as follows: Employee Severance Other Total Balance as of March 31, 2015 $ 2,966 $ 854 $ 3,820 Accrued 6,523 133 6,656 Accrual Adjustment — (316 ) (316 ) Costs incurred (5,755 ) (493 ) (6,248 ) Foreign currency impact and other (16 ) 33 17 Balance as of December 27, 2015 $ 3,718 $ 211 $ 3,929

Debt

Debt	9 Months Ended
	Dec. 27, 2015
Text Block [Abstract]
Debt	Debt The following summarizes the Company’s long-term debt as of December 27, 2015 and March 31, 2015 giving effect to the adoption of ASU 2015-3: December 27, 2015 March 31, 2015 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs 5.00% Senior Notes due 2023 $ 300,000 $ 4,526 $ — $ — 2011 Credit Facility, due 2018 333,250 2,055 325,000 2,615 3.375% Convertible Notes, net of discount, due 2038 — — 170,936 97 Total $ 633,250 $ 6,581 $ 495,936 $ 2,712 Long-term debt, net of unamortized issuance costs $ 626,669 $ 493,224 As discussed in Note 1, the Company elected to early adopt accounting guidance issued in April 2015 to simplify the presentation of debt issuance costs. This change in accounting principle was implemented retrospectively as of March 31, 2015. Debt issuance costs that are incurred by the Company in connection with the issuance of debt are deferred and amortized to interest expense using the effective interest method over the contractual term of the underlying indebtedness. The Company has reclassified debt issuance costs as a direct reduction to the related debt obligation on the balance sheet as of March 31, 2015 . 5.00% Senior Notes On April 23, 2015, the Company issued $300,000 in aggregate principal amount of 5.00% Senior Notes due 2023 (the “Notes”). The Notes bear interest at a rate of 5.00% per annum accruing from April 23, 2015. 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. The net proceeds from the sale of the Notes were used primarily to repay and retire in full the principal amount of the Company’s senior 3.375% convertible notes (the “Convertible Notes”), as discussed below, as well as fund the accelerated share repurchase program discussed in Note 12. 2011 Credit Facility The Company is party to a $350,000 senior secured revolving credit facility (as amended, “2011 Credit Facility”) and, on July 8, 2014, amended the credit facility while also entering into an Incremental Commitment Agreement pursuant to which certain banks agreed to provide incremental term loan commitments of $150,000 and incremental revolving commitments of $150,000 . Pursuant to these changes, the 2011 Credit Facility is now comprised of 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. The Term Loan is payable in quarterly installments of $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 will 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 $11,250 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 December 27, 2015 , the Company had $187,000 outstanding in revolver borrowings and $146,250 under its Term Loan borrowings. 3.375% Convertible Notes On May 7, 2015, the Company filed a notice of redemption for all of the Convertible Notes with a redemption date of June 8, 2015. 99% of the Convertible Notes holders exercised their conversion rights on or before June 5, 2015, pursuant to which, on July 17, 2015, the Company paid $172,388 , in aggregate, towards the principal balance 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 shares of the Company's common stock from its treasury shares, thereby resulting in the extinguishment of all of the Convertible Notes as of that date. There was no impact to the income statement on the extinguishment as the fair value of the total settlement consideration transferred and allocated to the liability component approximated the carrying value of the Convertible Notes. The remaining consideration allocated to the equity component resulted in an adjustment to equity of $84,140 . The following represents the principal amount of the liability component, the unamortized discount, and the net carrying amount of the Convertible Notes as of December 27, 2015 and March 31, 2015 : December 27, 2015 March 31, 2015 Principal $ — $ 172,266 Unamortized discount — (1,330 ) Net carrying amount $ — $ 170,936 Short-Term Debt As of December 27, 2015 and March 31, 2015 , the Company had $23,503 and $19,715 , respectively, of short-term borrowings. The weighted-average interest rates on these borrowings were approximately 8% and 10% at December 27, 2015 and March 31, 2015 , respectively. Letters of Credit As of December 27, 2015 and March 31, 2015 , the Company had $4,396 and $3,862 , respectively, of standby letters of credit. Debt Issuance Costs In connection with the issuance of the Notes, the Company incurred $4,986 in debt issuance costs. Amortization expense, relating to debt issuance costs, included in interest expense was $343 and $332 , respectively, during the quarters ended December 27, 2015 and December 28, 2014 and $1,117 and $932 , respectively, for the nine months ended December 27, 2015 and December 28, 2014 . Debt issuance costs, net of accumulated amortization, totaled $6,581 and $ 2,712 , respectively, at December 27, 2015 and March 31, 2015 . Available Lines of Credit As of December 27, 2015 and March 31, 2015 , the Company had available and undrawn, under all its lines of credit, $447,369 and $464,733 , respectively, including $136,619 and $141,533 , respectively, of uncommitted lines of credit as of December 27, 2015 and March 31, 2015 .

Retirement Plans

Retirement Plans	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Service cost $ 118 $ 96 $ 201 $ 189 Interest cost 172 168 476 624 Expected return on plan assets (213 ) (223 ) (563 ) (551 ) Amortization and deferral 111 64 310 166 Curtailment loss 313 — — — Net periodic benefit cost $ 501 $ 105 $ 424 $ 428 United States Plans International Plans Nine months ended Nine months ended December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Service cost $ 364 $ 300 $ 617 $ 602 Interest cost 510 505 1,447 1,966 Expected return on plan assets (643 ) (666 ) (1,715 ) (1,724 ) Amortization and deferral 370 238 946 518 Curtailment loss 313 — — — Net periodic benefit cost $ 914 $ 377 $ 1,295 $ 1,362

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Dec. 27, 2015
Text Block [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of December 27, 2015 , the Company maintains the EnerSys Second Amended and Restated 2010 Equity Incentive Plan, as amended (“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 share units and other forms of equity-based compensation. The Company recognized stock-based compensation expense associated with its equity incentive plans of $4,545 for the third quarter of fiscal 2016 and $4,280 for the third quarter of fiscal 2015 . Stock-based compensation expense was $14,883 for the nine months of fiscal 2016 and $21,339 for the nine months of fiscal 2015 . 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 December 27, 2015 , the Company granted to non-employee directors 28,582 restricted stock units, pursuant to the EnerSys Deferred Compensation Plan for Non-Employee Directors. During the nine months ended December 27, 2015 , the Company granted to management and other key employees 127,966 non-qualified stock options, 212,278 performance-based market share units that vest three years from the date of grant and 120,287 restricted stock units that vest 25% each year over four years from the date of grant. Common stock activity during the nine months ended December 27, 2015 included the vesting of 137,636 restricted stock units and 536,490 market share units and exercise of 11,986 stock options. As of December 27, 2015 , there were 210,297 non-qualified stock options, 502,378 restricted stock units and 547,213 market share units outstanding.

Stockholders' Equity

Stockholders' Equity	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 : Shares outstanding as of March 31, 2015 44,068,588 Purchase of treasury stock (2,009,896 ) Shares issued to Convertible Notes holders 1,889,431 Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes 448,137 Shares outstanding as of December 27, 2015 44,396,260 Treasury Stock Reissuance On July 17, 2015, the Company settled the conversion premium on the Convertible Notes by issuing 1,889,431 shares from its treasury stock. The reissuance was recorded on a last-in, first-out method, and the difference between the repurchase cost and the fair value at reissuance was recorded as an adjustment to stockholders' equity. Accelerated Share Repurchase During the second quarter of fiscal 2016 , the Company entered into an accelerated share repurchase agreement (“ASR”) with a major financial institution to repurchase $120,000 to $180,000 of its common stock. The Company prepaid $180,000 and received an initial delivery of 2,000,000 shares with a fair market value of approximately $108,100 . The ASR is accounted for as a treasury stock repurchase, reducing the weighted average number of basic and diluted shares outstanding by the 2,000,000 shares initially repurchased, and as a forward contract indexed to the Company's own common shares to reflect the future settlement provisions. Because the minimum repurchase will be $120,000 , as of December 27, 2015 , $11,900 representing the difference between the fair value of shares delivered and the minimum notional amount of $120,000 is accounted for as an equity instrument and is included in additional paid-in capital and the optional $60,000 is included in prepaid and other current assets in the Consolidated Condensed Balance Sheet. The ASR is not accounted for as a derivative instrument. No shares were received during the current quarter pursuant to the ASR. On January 19, 2016, the ASR was settled and the Company received an additional 961,444 shares and $13,608 in cash for the remaining amount not settled in shares. The Company repurchased a total of 2,961,444 shares under the ASR for a total cash investment of $166,392 at an average price of $56.19 . See Note 15. At December 27, 2015 and March 31, 2015 , the Company held 9,716,516 shares and 9,596,051 shares as treasury stock, respectively. Accumulated Other Comprehensive Income ("AOCI") The components of AOCI, net of tax, as of December 27, 2015 and March 31, 2015 , are as follows: March 31, 2015 Before Reclassifications Amounts Reclassified from AOCI December 27, 2015 Pension funded status adjustment $ (23,719 ) $ — $ 930 $ (22,789 ) Net unrealized (loss) gain on derivative instruments (95 ) (3,818 ) 2,402 (1,511 ) Foreign currency translation adjustment (85,161 ) (19,329 ) — (104,490 ) Accumulated other comprehensive income (loss) $ (108,975 ) $ (23,147 ) $ 3,332 $ (128,790 ) 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 third quarter ended December 28, 2014 : 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 $ (2,474 ) Cost of goods sold Tax expense 912 Net unrealized gain on derivative instruments, net of tax $ (1,562 ) Defined benefit pension costs: Prior service costs and deferrals $ 230 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (75 ) Net periodic benefit cost, net of tax $ 155 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 table presents reclassifications from AOCI during the nine months ended December 28, 2014 : 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 $ (871 ) Cost of goods sold Tax expense 320 Net unrealized gain on derivative instruments, net of tax $ (551 ) Defined benefit pension costs: Prior service costs and deferrals $ 756 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (235 ) Net periodic benefit cost, net of tax $ 521 The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the nine months ended December 27, 2015 : Equity Attributable to EnerSys Stockholders Nonredeemable Noncontrolling Interests Total Equity Balance as of March 31, 2015 $ 1,038,900 $ 5,540 $ 1,044,440 Total comprehensive income: Net earnings (losses) 126,890 (53 ) 126,837 Net unrealized loss on derivative instruments, net of tax (1,416 ) — (1,416 ) Pension funded status adjustment, net of tax 930 — 930 Foreign currency translation adjustment (19,329 ) (214 ) (19,543 ) Total other comprehensive loss, net of tax (19,815 ) (214 ) (20,029 ) Total comprehensive income (loss) 107,075 (267 ) 106,808 Other changes in equity: Purchase of treasury stock including ASR (120,637 ) — (120,637 ) Reissuance of treasury stock to Convertible Notes holders 114,449 — 114,449 Adjustment to equity on debt extinguishment (84,140 ) — (84,140 ) Cash dividends - common stock ($0.525 per share) (23,322 ) — (23,322 ) Reclassification of redeemable equity component of Convertible Notes 1,330 — 1,330 Other, including activity related to equity awards 3,485 — 3,485 Balance as of December 27, 2015 $ 1,037,140 $ 5,273 $ 1,042,413 The following demonstrates the change in redeemable noncontrolling interests during the nine months ended December 27, 2015 : Redeemable Noncontrolling Interests Balance as of March 31, 2015 $ 6,956 Net loss (921 ) Foreign currency translation adjustment (1,211 ) Balance as of December 27, 2015 $ 4,824

Earnings Per Share

Earnings Per Share	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Net earnings attributable to EnerSys stockholders $ 38,478 $ 49,252 $ 126,890 $ 154,737 Weighted-average number of common shares outstanding: Basic 44,394,925 45,188,942 44,524,289 46,073,961 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 581,279 791,739 650,529 898,436 Convertible Notes — 1,387,492 737,841 1,571,499 Diluted weighted-average number of common shares outstanding 44,976,204 47,368,173 45,912,659 48,543,896 Basic earnings per common share attributable to EnerSys stockholders $ 0.87 $ 1.09 $ 2.85 $ 3.36 Diluted earnings per common share attributable to EnerSys stockholders $ 0.86 $ 1.04 $ 2.76 $ 3.19 Anti-dilutive equity awards not included in diluted weighted-average common shares — — — 138 On July 17, 2015, the Company paid $172,388 , in aggregate, towards the principal balance 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 shares of its common stock, which were included in the diluted weighted average shares outstanding for the period prior to the extinguishment. During the second quarter of fiscal 2016 , the Company entered into an ASR with a major financial institution to repurchase $120,000 to $180,000 of its common stock. The Company prepaid $180,000 and received an initial delivery of 2,000,000 shares with a fair market value of approximately $108,100 . The ASR is accounted for as a treasury stock repurchase, reducing the weighted average number of basic and diluted shares outstanding by the 2,000,000 shares initially repurchased, and as a forward contract indexed to the Company's own common shares to reflect the future settlement provisions. No shares were received pursuant to the ASR during the current quarter. On January 19, 2016, the ASR was settled and the Company received an additional 961,444 shares. See Note 15 for more information.

Business Segments

Business Segments	9 Months Ended
	Dec. 27, 2015
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 Zurich, 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 quarters and nine months ended December 27, 2015 and December 28, 2014 is shown below: Quarter ended Nine months ended December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Net sales by segment to unaffiliated customers Americas $ 306,331 $ 314,263 $ 945,839 $ 978,376 EMEA 196,829 242,345 582,896 717,620 Asia 70,413 54,970 176,040 179,619 Total net sales $ 573,573 $ 611,578 $ 1,704,775 $ 1,875,615 Net sales by product line Reserve power $ 271,948 $ 306,989 $ 810,448 $ 933,888 Motive power 301,625 304,589 894,327 941,727 Total net sales $ 573,573 $ 611,578 $ 1,704,775 $ 1,875,615 Intersegment sales Americas $ 6,334 $ 11,657 $ 23,041 $ 31,552 EMEA 17,537 16,433 59,999 51,324 Asia 8,205 6,560 20,937 27,144 Total intersegment sales (1) $ 32,076 $ 34,650 $ 103,977 $ 110,020 Operating earnings by segment Americas $ 40,572 $ 40,884 $ 134,344 $ 120,751 EMEA 16,525 27,805 54,218 79,845 Asia 1,568 2,431 1,388 9,672 Restructuring charges - Americas (865 ) — (1,435 ) — Restructuring and other exit charges - EMEA (2,153 ) (563 ) (4,706 ) (4,202 ) Restructuring charges - Asia (186 ) (1,874 ) (910 ) (1,874 ) Reversal of legal accrual, net of fees - Americas — — 799 16,233 Legal proceedings charge - EMEA — — (4,000 ) — Gain on sale of facility - Asia — — 4,348 — Total operating earnings (2) $ 55,461 $ 68,683 $ 184,046 $ 220,425 (1) Intersegment sales are presented on a cost-plus basis, which takes into consideration the effect of transfer prices between legal entities. (2) The Company does not allocate interest expense or other (income) expense to the reportable segments.

Subsequent Events

Subsequent Events	9 Months Ended
	Dec. 27, 2015
Text Block [Abstract]
Subsequent Events	Subsequent Events On January 19, 2016, the ASR was settled and the Company received an additional 961,444 shares and $13,608 in cash for the remaining amount not settled in shares. The Company repurchased a total of 2,961,444 shares under the ASR for a total cash investment of $166,392 at an average price of $56.19 . On January 28, 2016, the Board of Directors approved a quarterly cash dividend of $0.175 per share of common stock to be paid on March 25, 2016, to stockholders of record as of March 11, 2016.

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Dec. 27, 2015
Inventory Disclosure [Abstract]
Summary Of Inventories	Inventories, net consist of: December 27, 2015 March 31, 2015 Raw materials $ 91,308 $ 82,954 Work-in-process 104,371 106,196 Finished goods 145,491 147,861 Total $ 341,170 $ 337,011

Fair Value of Financial Instr23

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 and March 31, 2015 and the basis for that measurement: Total Fair Value Measurement December 27, 2015 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ 289 $ — $ 289 $ — Foreign currency forward contracts 264 — 264 — Total derivatives $ 553 $ — $ 553 $ — Total Fair Value Measurement March 31, 2015 Quoted Price in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Lead forward contracts $ (341 ) $ — $ (341 ) $ — Foreign currency forward contracts 4,155 — 4,155 — Total derivatives $ 3,814 $ — $ 3,814 $ —
Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments	The carrying amounts and estimated fair values of the Company’s derivatives, Notes and Convertible Notes (as defined in Note 9) at December 27, 2015 and March 31, 2015 were as follows: December 27, 2015 March 31, 2015 Carrying Amount Fair Value Carrying Amount Fair Value Financial assets: Derivatives (1) $ 553 $ — $ 4,155 $ 4,155 Financial liabilities: Notes (2) $ 300,000 $ 300,000 (2) $ — $ — Convertible Notes (2) (3) — — 170,936 (3) 277,348 (2) Derivatives (1) — — 341 341 (1) Represents lead and foreign currency forward contracts. (2) The fair value amount of the Notes at December 27, 2015 and the Convertible Notes at March 31, 2015 represent the trading value of the instruments. (3) The carrying amount of the Convertible Notes at March 31, 2015 represent the $172,266 principal balance, less the unamortized debt discount (see Note 9 for further details).

Derivative Financial Instrume24

Derivative Financial Instruments (Tables)	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 and March 31, 2015 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments December 27, 2015 March 31, 2015 December 27, 2015 March 31, 2015 Prepaid and other current assets Lead forward contracts $ 289 $ — $ — $ — Foreign currency forward contracts 350 3,735 — 420 Total assets $ 639 $ 3,735 $ — $ 420 Accrued expenses Lead forward contracts $ — $ 341 $ — $ — Foreign currency forward contracts — — 86 — Total liabilities $ — $ 341 $ 86 $ —
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 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 quarter ended December 28, 2014 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 $ (5,898 ) Cost of goods sold $ 1,554 Foreign currency forward contracts 32 Cost of goods sold 920 Total $ (5,866 ) $ 2,474 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 $ (232 ) Total $ (232 ) 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 ) The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the nine months ended December 28, 2014 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 $ (6,158 ) Cost of goods sold $ (121 ) Foreign currency forward contracts 2,756 Cost of goods sold 992 Total $ (3,402 ) $ 871 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 $ 132 Total $ 132

Warranties (Tables)

Warranties (Tables)	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Balance at beginning of period $ 40,140 $ 40,518 $ 39,810 $ 40,426 Current period provisions 5,756 4,083 14,339 13,700 Costs incurred (4,422 ) (3,706 ) (12,930 ) (12,171 ) Foreign currency translation adjustment (427 ) (612 ) (172 ) (1,672 ) Balance at end of period $ 41,047 $ 40,283 $ 41,047 $ 40,283

Restructuring Plans (Tables)

Restructuring Plans (Tables)	9 Months Ended
	Dec. 27, 2015
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, 2015 $ 2,966 $ 854 $ 3,820 Accrued 6,523 133 6,656 Accrual Adjustment — (316 ) (316 ) Costs incurred (5,755 ) (493 ) (6,248 ) Foreign currency impact and other (16 ) 33 17 Balance as of December 27, 2015 $ 3,718 $ 211 $ 3,929

Debt (Tables)

Debt (Tables)	9 Months Ended
	Dec. 27, 2015
Text Block [Abstract]
Long-Term Debt And Capital Lease Obligations	The following summarizes the Company’s long-term debt as of December 27, 2015 and March 31, 2015 giving effect to the adoption of ASU 2015-3: December 27, 2015 March 31, 2015 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs 5.00% Senior Notes due 2023 $ 300,000 $ 4,526 $ — $ — 2011 Credit Facility, due 2018 333,250 2,055 325,000 2,615 3.375% Convertible Notes, net of discount, due 2038 — — 170,936 97 Total $ 633,250 $ 6,581 $ 495,936 $ 2,712 Long-term debt, net of unamortized issuance costs $ 626,669 $ 493,224
Components Of Net Carrying Amount Of Convertible Notes	The following represents the principal amount of the liability component, the unamortized discount, and the net carrying amount of the Convertible Notes as of December 27, 2015 and March 31, 2015 : December 27, 2015 March 31, 2015 Principal $ — $ 172,266 Unamortized discount — (1,330 ) Net carrying amount $ — $ 170,936

Retirement Plans (Tables)

Retirement Plans (Tables)	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Service cost $ 118 $ 96 $ 201 $ 189 Interest cost 172 168 476 624 Expected return on plan assets (213 ) (223 ) (563 ) (551 ) Amortization and deferral 111 64 310 166 Curtailment loss 313 — — — Net periodic benefit cost $ 501 $ 105 $ 424 $ 428

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 : Shares outstanding as of March 31, 2015 44,068,588 Purchase of treasury stock (2,009,896 ) Shares issued to Convertible Notes holders 1,889,431 Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes 448,137 Shares outstanding as of December 27, 2015 44,396,260
Components Of Accumulated Other Comprehensive Income	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 third quarter ended December 28, 2014 : 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 $ (2,474 ) Cost of goods sold Tax expense 912 Net unrealized gain on derivative instruments, net of tax $ (1,562 ) Defined benefit pension costs: Prior service costs and deferrals $ 230 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (75 ) Net periodic benefit cost, net of tax $ 155 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 table presents reclassifications from AOCI during the nine months ended December 28, 2014 : 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 $ (871 ) Cost of goods sold Tax expense 320 Net unrealized gain on derivative instruments, net of tax $ (551 ) Defined benefit pension costs: Prior service costs and deferrals $ 756 Net periodic benefit cost, included in cost of goods sold and operating expenses - See Note 10 Tax benefit (235 ) Net periodic benefit cost, net of tax $ 521 The components of AOCI, net of tax, as of December 27, 2015 and March 31, 2015 , are as follows: March 31, 2015 Before Reclassifications Amounts Reclassified from AOCI December 27, 2015 Pension funded status adjustment $ (23,719 ) $ — $ 930 $ (22,789 ) Net unrealized (loss) gain on derivative instruments (95 ) (3,818 ) 2,402 (1,511 ) Foreign currency translation adjustment (85,161 ) (19,329 ) — (104,490 ) Accumulated other comprehensive income (loss) $ (108,975 ) $ (23,147 ) $ 3,332 $ (128,790 )
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 December 27, 2015 : Equity Attributable to EnerSys Stockholders Nonredeemable Noncontrolling Interests Total Equity Balance as of March 31, 2015 $ 1,038,900 $ 5,540 $ 1,044,440 Total comprehensive income: Net earnings (losses) 126,890 (53 ) 126,837 Net unrealized loss on derivative instruments, net of tax (1,416 ) — (1,416 ) Pension funded status adjustment, net of tax 930 — 930 Foreign currency translation adjustment (19,329 ) (214 ) (19,543 ) Total other comprehensive loss, net of tax (19,815 ) (214 ) (20,029 ) Total comprehensive income (loss) 107,075 (267 ) 106,808 Other changes in equity: Purchase of treasury stock including ASR (120,637 ) — (120,637 ) Reissuance of treasury stock to Convertible Notes holders 114,449 — 114,449 Adjustment to equity on debt extinguishment (84,140 ) — (84,140 ) Cash dividends - common stock ($0.525 per share) (23,322 ) — (23,322 ) Reclassification of redeemable equity component of Convertible Notes 1,330 — 1,330 Other, including activity related to equity awards 3,485 — 3,485 Balance as of December 27, 2015 $ 1,037,140 $ 5,273 $ 1,042,413

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Dec. 27, 2015
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 December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Net earnings attributable to EnerSys stockholders $ 38,478 $ 49,252 $ 126,890 $ 154,737 Weighted-average number of common shares outstanding: Basic 44,394,925 45,188,942 44,524,289 46,073,961 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 581,279 791,739 650,529 898,436 Convertible Notes — 1,387,492 737,841 1,571,499 Diluted weighted-average number of common shares outstanding 44,976,204 47,368,173 45,912,659 48,543,896 Basic earnings per common share attributable to EnerSys stockholders $ 0.87 $ 1.09 $ 2.85 $ 3.36 Diluted earnings per common share attributable to EnerSys stockholders $ 0.86 $ 1.04 $ 2.76 $ 3.19 Anti-dilutive equity awards not included in diluted weighted-average common shares — — — 138

Business Segments Business Segm

Business Segments Business Segments (Tables)	9 Months Ended
	Dec. 27, 2015
Segment Reporting [Abstract]
Selected Financial Data for Reportable Business Segments and Product Lines	: Quarter ended Nine months ended December 27, 2015 December 28, 2014 December 27, 2015 December 28, 2014 Net sales by segment to unaffiliated customers Americas $ 306,331 $ 314,263 $ 945,839 $ 978,376 EMEA 196,829 242,345 582,896 717,620 Asia 70,413 54,970 176,040 179,619 Total net sales $ 573,573 $ 611,578 $ 1,704,775 $ 1,875,615 Net sales by product line Reserve power $ 271,948 $ 306,989 $ 810,448 $ 933,888 Motive power 301,625 304,589 894,327 941,727 Total net sales $ 573,573 $ 611,578 $ 1,704,775 $ 1,875,615 Intersegment sales Americas $ 6,334 $ 11,657 $ 23,041 $ 31,552 EMEA 17,537 16,433 59,999 51,324 Asia 8,205 6,560 20,937 27,144 Total intersegment sales (1) $ 32,076 $ 34,650 $ 103,977 $ 110,020 Operating earnings by segment Americas $ 40,572 $ 40,884 $ 134,344 $ 120,751 EMEA 16,525 27,805 54,218 79,845 Asia 1,568 2,431 1,388 9,672 Restructuring charges - Americas (865 ) — (1,435 ) — Restructuring and other exit charges - EMEA (2,153 ) (563 ) (4,706 ) (4,202 ) Restructuring charges - Asia (186 ) (1,874 ) (910 ) (1,874 ) Reversal of legal accrual, net of fees - Americas — — 799 16,233 Legal proceedings charge - EMEA — — (4,000 ) — Gain on sale of facility - Asia — — 4,348 — Total operating earnings (2) $ 55,461 $ 68,683 $ 184,046 $ 220,425 (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.

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 27, 2015	Mar. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 91,308	$ 82,954
Work-in-process	104,371	106,196
Finished goods	145,491	147,861
Total	$ 341,170	$ 337,011

Fair Value of Financial Instr33

Fair Value of Financial Instruments (Financial Assets and (Liabilities)) (Details) - USD ($) $ in Thousands	Dec. 27, 2015	Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ 553	$ 3,814
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value		3,814
Lead hedge forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	289	(341)
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	289	(341)
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	264	4,155
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	$ 264	$ 4,155

Fair Value of Financial Instr34

Fair Value of Financial Instruments (Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Dec. 27, 2015	Mar. 31, 2015
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	$ 553	$ 4,155
Notes	300,000	0
Convertible Notes	0	170,936
Derivative liability	0	341
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	0	4,155
Notes	300,000	0
Convertible Notes	0	277,348
Derivative liability	$ 0	$ 341

Fair Value of Financial Instr35

Fair Value of Financial Instruments (Additional Information) (Details) - USD ($) $ in Thousands	Dec. 27, 2015	Apr. 23, 2015	Mar. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of debt instrument			$ 172,266
Convertible Notes Payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 0		$ 170,936
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	$ 0

Derivative Financial Instrume36

Derivative Financial Instruments (Location and Amounts of Derivative Fair Values) (Details) - USD ($) $ in Thousands	Dec. 27, 2015	Mar. 31, 2015
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	$ 639	$ 3,735
Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	0	341
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	0	420
Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	86	0
Foreign currency forward contracts | Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	350	3,735
Foreign currency forward contracts | Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	0
Foreign currency forward contracts | Not Designated as Hedging Instrument | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, Fair Value	0	420
Foreign currency forward contracts | Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	86
Lead hedge forward contracts | Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, Fair Value	$ 0	$ 341

Derivative Financial Instrume37

Derivative Financial Instruments (Derivatives Designated as Cash Flow Hedges) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 4,744	$ (2,474)	$ 3,806	$ (871)
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	1,634	(5,866)	(6,054)	(3,402)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(4,744)	2,474	(3,806)	871
Designated as Hedging Instrument | Lead hedge forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	1,109	(5,898)	(4,006)	(6,158)
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)	(4,448)	1,554	(7,461)	(121)
Designated as Hedging Instrument | Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)	525	32	(2,048)	2,756
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)	$ (296)	$ 920	$ 3,655	$ 992

Derivative Financial Instrume38

Derivative Financial Instruments (Derivatives Not Designated as Hedging Instruments) (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 175	$ (232)	$ (119)	$ 132
Foreign currency forward contracts | Other Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 175	$ (232)	$ (119)	$ 132

Derivative Financial Instrume39

Derivative Financial Instruments (Additional Information) (Details) $ in Thousands, lb in Millions	3 Months Ended		9 Months Ended
	Dec. 27, 2015USD ($)lb	Dec. 28, 2014USD ($)	Dec. 27, 2015USD ($)lb	Dec. 28, 2014USD ($)	Mar. 31, 2015USD ($)lb
Derivatives, Fair Value [Line Items]
Notional amount	$ 55,564		$ 55,564		$ 75,878
Recorded expense in the consolidated condensed statements of income	(1,142)	$ 866	(2,573)	$ 3,244
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	$ 15,270		$ 15,270		$ 26,246
Lead hedge forward contracts
Derivatives, Fair Value [Line Items]
Notional amount in pounds | lb	44.2		44.2		91.6
Hedging Derivatives Maturity Upper Limit			1 year

Income Taxes (Additional Inform

Income Taxes (Additional Information) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Disclosure Income Taxes Additional Information [Abstract]
Effective income tax rates	22.00%	23.60%	23.60%	26.00%
Deferred Income Tax Expense (Benefit)			$ (3,248,000)	$ 21,951,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign			$ 0.51	$ 0.56
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent			10.10%	14.70%
Tax Rate of Swiss Subsidiary			6.00%

Warranties (Analysis of Changes

Warranties (Analysis of Changes in the Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Disclosure Analysis Of Changes In Liability For Product Warranties [Abstract]
Balance at beginning of period	$ 40,140	$ 40,518	$ 39,810	$ 40,426
Current period provisions	5,756	4,083	14,339	13,700
Costs incurred	(4,422)	(3,706)	(12,930)	(12,171)
Foreign exchange and other	(427)	(612)	(172)	(1,672)
Balance at end of period	$ 41,047	$ 40,283	$ 41,047	$ 40,283

Commitments Contingencies and L

Commitments Contingencies and Litigation (Additional Information) (Details) $ in Thousands, lb in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Dec. 27, 2015USD ($)	Dec. 27, 2015USD ($)	Dec. 28, 2014USD ($)	Mar. 31, 2015USD ($)lb
Commitments, Contingencies And Litigation [Line Items]
Litigation Settlement, Amount		$ 3,201	$ (16,233)
Provision For Environmental Liabilities		1,123		$ 2,902
Foreign currency forward contracts
Commitments, Contingencies And Litigation [Line Items]
Purchase price of hedges	$ 70,834	70,834		$ 102,124
Lead hedge forward contracts
Commitments, Contingencies And Litigation [Line Items]
Purchase price of hedges, pounds of lead | lb				91.6
Purchase price of hedges	34,072	34,072		$ 76,143
Europe
Commitments, Contingencies And Litigation [Line Items]
Litigation Settlement, Amount	$ 0	$ 4,000

Restructuring Plans (Roll-forwa

Restructuring Plans (Roll-forward of Restructuring Reserve) (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 27, 2015	Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	$ 3,929	$ 3,820
Restructuring and Related Cost, Incurred Cost	6,656
Restructuring Reserve, Translation and Other Adjustment	(316)
Payments for Restructuring	(6,248)
Restructuring Reserve, Translation Adjustment	17
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	3,718	2,966
Restructuring and Related Cost, Incurred Cost	6,523
Payments for Restructuring	(5,755)
Restructuring Reserve, Translation Adjustment	(16)
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	211	$ 854
Restructuring and Related Cost, Incurred Cost	133
Restructuring Reserve, Translation and Other Adjustment	(316)
Payments for Restructuring	(493)
Restructuring Reserve, Translation Adjustment	$ 33

Restructuring Plans (Additional

Restructuring Plans (Additional Information) (Details)	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 27, 2015USD ($)Employee	Jun. 28, 2015USD ($)Employee	Dec. 28, 2014USD ($)	Dec. 27, 2015USD ($)Employee	Dec. 28, 2014USD ($)	Mar. 31, 2015USD ($)	Mar. 31, 2014USD ($)Employee	Mar. 31, 2013USD ($)Employee
Restructuring Cost and Reserve [Line Items]
Charges related to restructuring plan				$ 6,656,000
Restructuring reserve	$ 3,929,000			3,929,000		$ 3,820,000
Restructuring charges	3,204,000		$ 2,437,000	7,051,000	$ 6,076,000
Restructuring Reserve, Translation and Other Adjustment				(316,000)
Restructuring charges, cash charges related to employee severance and other charges				6,248,000
Restructuring Costs				398,000	$ 644,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Charges related to restructuring plan				6,523,000
Restructuring reserve	3,718,000			3,718,000		2,966,000
Restructuring charges, cash charges related to employee severance and other charges				5,755,000
Restructurings Related To Improving Efficiency Of Manufacturing Operations In Emea [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Translation and Other Adjustment				316
Americas | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	300,000
Americas | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 1,500,000
Americas | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Severance Costs		$ 570,000
Americas | 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	120
Restructuring reserve	$ 552,000			552,000
Americas | Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member] | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges	$ 1,100,000			1,100,000
Americas | Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				865,000
Americas | Restructurings Related To Improving Efficiency Of Manufacturing Operations In Americas [Member]
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees | Employee	100
Americas | Restructurings Related To Improving Efficiency Of Manufacturing Operations In Americas [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	$ 2,100,000
European Operations
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees | Employee								140
Charges related to restructuring plan								$ 5,207,000
Restructuring charges, cash charges related to employee severance and other charges				$ 271,000
Restructuring Costs								6,895,000
European Operations | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, non-cash charges related to the write-off of fixed assets and inventory								1,000
European Operations | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, cash charges related to employee severance and other charges								$ 5,000
European Operations | Restructuring Related To A Portion Of Sales And Engineering in Europe [Member]
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees | Employee				10
Restructuring reserve	304,000			$ 304,000
Restructuring charges, cash charges related to employee severance and other charges				377,000		193,000
European Operations | Restructuring Related To A Portion Of Sales And Engineering in Europe [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				337,000		450,000
European Operations | Restructuring Related To A Portion Of Sales And Engineering in Europe [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs						800,000
European Operations | Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve	2,230,000			2,230,000
Restructuring charges, cash charges related to employee severance and other charges				1,607,000
European Operations | Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member] | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Expected additional restructuring charges	2,800,000			2,800,000
European Operations | Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				3,858,000
European Operations | Restructurings Related To Improving Efficiency Related to Motive Power Assembly and Distribution Center [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	6,600,000
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							500
Restructuring reserve	843,000			843,000
Restructuring charges						22,115,000
Restructuring charges, cash charges related to employee severance and other charges				914,000		9,737,000
Expected additional restructuring charges	100,000			100,000
European Operations | Restructurings Related To Improving Efficiency Of Manufacturing Operations In Emea [Member] | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, non-cash charges related to the write-off of fixed assets and inventory							$ 11,000,000
Restructuring Costs						10,934,000	22,800,000
European Operations | Restructurings Related To Improving Efficiency Of Manufacturing Operations In Emea [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges				826,000		11,181,000
European Operations | Restructurings Related To Improving Efficiency Of Manufacturing Operations In Emea [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, cash charges related to employee severance and other charges							$ 11,800,000
Asia | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		0
Asia | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, cash charges related to employee severance and other charges		$ 5,000
Asia | Restructurings Related To Manufacturing Facility in Jiangdu [Member]
Restructuring Cost and Reserve [Line Items]
Expected reduction in number of employees | Employee		300
Restructuring reserve	0			0
Restructuring charges, cash charges related to employee severance and other charges				2,509,000		1,874,000
Asia | Restructurings Related To Manufacturing Facility in Jiangdu [Member] | Non Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Costs						1,000
Expected additional restructuring charges	$ 700,000			$ 700,000
Asia | Restructurings Related To Manufacturing Facility in Jiangdu [Member] | Cash Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges						0
Asia | Restructurings Related To Manufacturing Facility in Jiangdu [Member] | Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 5,400,000				$ 3,870,000

Debt (Long-term Debt Including

Debt (Long-term Debt Including Capital Lease Obligations) (Details) - USD ($)	Dec. 27, 2015	Apr. 23, 2015	Mar. 31, 2015	Jul. 08, 2014
Debt Instrument [Line Items]
Debt and Capital Lease Obligations	$ 633,250,000		$ 495,936,000
Unamortized Debt Issuance Expense	6,581,000		2,712,000
Long-term Debt, Excluding Current Maturities	626,669,000		493,224,000
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	0
Unamortized Debt Issuance Expense	4,526,000
Three point three seven five convertible notes [Member]
Debt Instrument [Line Items]
Long-term debt	0		170,936,000
Unamortized Debt Issuance Expense			97,000
Secured Debt | Incremental Commitment Agreement | 2011 Credit Facility due 2018
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	2,055,000		2,615,000
Line of Credit Facility, Incremental Term Loan Commitment	333,250,000		$ 325,000,000
Secured Debt | Incremental Commitment Agreement
Debt Instrument [Line Items]
Long-term debt	187,000
Secured Debt | Secured Debt | Incremental Commitment Agreement
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment				$ 150,000,000
Secured Debt | Secured Debt | Incremental Commitment Agreement | 2011 Credit Facility due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment	$ 146,250,000

Debt (Convertible Notes) (Detai

Debt (Convertible Notes) (Details) - Convertible Notes Payable - USD ($) $ in Thousands	Dec. 27, 2015	Mar. 31, 2015
Principal	$ 0	$ 172,266
Unamortized discount	0	1,330
Long-term debt	$ 0	$ 170,936

Debt (Additional Information) (

Debt (Additional Information) (Details) - USD ($)	Jul. 17, 2015	Jun. 05, 2015	Jul. 08, 2014	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014	Mar. 31, 2015	Apr. 23, 2015
Debt Instrument [Line Items]
Face value of debt instrument								$ 172,266,000
Debt Instrument, Convertible, Percent of Holders that Exercised Conversion Rights		99.00%
Payment of principal and accreted interest on Convertible Notes	$ 172,388,000					$ 172,266,000	$ 234,000
Number of shares issued from conversion	1,889,431					1,889,431
Short-term debt				$ 23,503,000		$ 23,503,000		$ 19,715,000
Short-term Debt, Weighted Average Interest Rate				8.00%		8.00%		10.00%
Company Owned Capital Stock Percentage Securing Senior Secured Credit Facility								65.00%
Temporary Equity, Carrying Amount, Attributable to Parent				$ 0		$ 0		$ 1,330,000
Payments of Financing Costs						4,986,000	1,076,000
Amortization of Other Deferred Charges				343,000	$ 332,000	1,117,000	$ 932,000
Deferred Finance Costs, Net				6,581,000		6,581,000		3,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt						84,140
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		$ 0	$ 300,000,000
Debt Instrument Interest Rate				5.00%		5.00%		5.00%
Three point three seven five convertible notes [Member]
Debt Instrument [Line Items]
Long-term debt				$ 0		$ 0		$ 170,936,000
Convertible Notes Payable
Debt Instrument [Line Items]
Available lines of credit				447,369,000		447,369,000		464,733,000
Outstanding amount				136,619,000		136,619,000		141,533,000
Stand by letters of credit				4,396,000		4,396,000		3,862,000
Long-term debt				0		0		170,936,000
Long-term Debt, Gross				0		0		172,266,000
Senior Secured Revolving Credit Facility | Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity				350,000,000		350,000,000
Incremental Commitment Agreement | Secured Debt | 2011 Credit Facility due 2018
Debt Instrument [Line Items]
Line of Credit Facility, Incremental Term Loan Commitment				333,250,000		333,250,000		325,000,000
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
Line of Credit Facility, Incremental Revolving Commitment			150,000,000
Incremental Commitment Agreement | Secured Debt
Debt Instrument [Line Items]
Long-term debt				187,000		187,000
Incremental Commitment Agreement | Secured Debt | Secured Debt
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months								$ 11,250,000
Line of Credit Facility, Maximum Borrowing Capacity			150,000,000
Line of Credit Facility, Incremental Term Loan Commitment			$ 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				$ 146,250,000		$ 146,250,000
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
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
United States Pension Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 118	$ 96	$ 364	$ 300
Interest cost	172	168	510	505
Expected return on plan assets	(213)	(223)	(643)	(666)
Amortization and deferral	111	64	370	238
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments	313		313
Net periodic benefit cost	501	105	914	377
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Service cost	201	189	617	602
Interest cost	476	624	1,447	1,966
Expected return on plan assets	(563)	(551)	(1,715)	(1,724)
Amortization and deferral	310	166	946	518
Net periodic benefit cost	$ 424	$ 428	$ 1,295	$ 1,362

Stock-Based Compensation (Addit

Stock-Based Compensation (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
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	$ 4,545	$ 4,280	$ 14,883	$ 21,339
Stock options granted			127,966,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			11,986,000
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period			212,278,000
Vesting period			3 years
Vested restricted stock and restricted stock units			536,490,000
Stock option grants outstanding	547,213,000		547,213,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and restricted stock units			137,636,000
Stock option grants outstanding	502,378,000		502,378,000
Nonqualified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding	210,297,000		210,297,000
Management | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period			28,582,000
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			120,287,000

Stockholders' Equity (Change in

Stockholders' Equity (Change in the Number of Shares of Common Stock Outstanding) (Details) - shares	Jul. 17, 2015	Dec. 27, 2015	Dec. 27, 2015
Class of Stock [Line Items]
Shares outstanding, beginning balance			44,068,588
Number of shares of common stock purchased		(2,000,000)	(2,009,896)
Debt Conversion, Converted Instrument, Shares Issued	1,889,431		1,889,431
Shares issued as part of equity-based compensation plans, net of equity awards surrendered for option price and taxes			448,137
Shares outstanding, ending balance		44,396,260	44,396,260

Stockholders' Equity (Component

Stockholders' Equity (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension funded status adjustment			$ (23,719)
Unrealized gain on derivative instruments			(95)
Foreign currency translation adjustment			(85,161)
Accumulated other comprehensive income	$ (128,790)		(128,790)		$ (108,975)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, before Tax, [Abstract]
Amount recognized in AOCI, net of tax			0
Amount recognized in AOCI - Derivatives, net of tax			(3,818)
Amount recognized in AOCI - CTA, net of tax			(19,329)
Accumulated other comprehensive income, Before-Tax Amount			(23,147)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax [Abstract]
Amount reclassified out of AOCI, net of tax	292	$ 155	930	$ 521
Amount reclassified out of AOCI - Derivatives, net of tax	2,991	$ (1,562)	2,402	$ (551)
Amount reclassified out of AOCI - CTA, net of tax			0
Accumulated other comprehensive income			3,332
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract]
Pension funded status adjustment	(22,789)		(22,789)
Unrealized gain on derivative instruments	(1,511)		(1,511)
Foreign currency translation adjustment	(104,490)		(104,490)
Accumulated other comprehensive income	$ (128,790)		$ (128,790)		$ (108,975)

Stockholders' Equity Components

Stockholders' Equity Components of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Equity [Abstract]
Net unrealized (gain) on derivative instruments	$ 4,744	$ (2,474)	$ 3,806	$ (871)
Unrealized gain (loss) on derivative instruments, Tax Benefit (Expense)	(1,753)	912	(1,404)	320
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount	2,991	(1,562)	2,402	(551)
Pension funded status adjustment, Before-Tax Amount	421	230	1,316	756
Pension funded status adjustment, Tax Benefit (Expense)	129	75	386	235
Net periodic benefit cost, net of tax	$ 292	$ 155	$ 930	$ 521

Stockholders' Equity Noncontrol

Stockholders' Equity Noncontrolling Interests (Details) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014	Mar. 31, 2015
Noncontrolling Interest [Line Items]
Dividends declared (in dollars per share)	$ 0.175	$ 0.175	$ 0.53	$ 0.53
Stockholders' Equity Attributable to Noncontrolling Interest	$ 5,273,000		$ 5,273,000		$ 5,540,000
Net earnings attributable to noncontrolling interests	264,000	$ (79,000)	974,000	$ (259,000)
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount	2,991,000	(1,562,000)	2,402,000	(551,000)
Amount reclassified out of AOCI, net of tax	292,000	155,000	930,000	521,000
Total other comprehensive (loss) income, net of tax	(8,786,000)	(48,038,000)	(21,240,000)	(98,120,000)
Total comprehensive income	29,428,000	$ 1,293,000	104,676,000	56,876,000
Payments for Repurchase of Common Stock			120,637,000	176,028,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt			84,140
Payments of Dividends			23,322,000	$ 24,021,000
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature			(1,330,000)
Redeemable Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	1,037,140,000		1,037,140,000		1,038,900,000
Net earnings attributable to noncontrolling interests			126,890,000
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount			(1,416,000)
Amount reclassified out of AOCI, net of tax			930,000
Foreign currency translation adjustment, Net-of Tax Amount			(19,329,000)
Total other comprehensive (loss) income, net of tax			(19,815,000)
Total comprehensive income			107,075,000
Payments for Repurchase of Common Stock			(120,637,000)
Stock Issued During Period, Value, Treasury Stock Reissued			114,449,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt			(84,140,000)
Payments of Dividends			(23,322,000)
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature			(1,330,000)
Proceeds from Stock Options Exercised			3,485,000
Nonredeemable Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	5,273,000		5,273,000		5,540,000
Net earnings attributable to noncontrolling interests			(53,000)
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			(214,000)
Total other comprehensive (loss) income, net of tax			(214,000)
Total comprehensive income			(267,000)
Payments for Repurchase of Common Stock			0
Payments of Dividends			0
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature			0
Proceeds from Stock Options Exercised			0
Stockholders' Equity, Total [Member]
Noncontrolling Interest [Line Items]
Stockholders' Equity Attributable to Noncontrolling Interest	$ 1,042,413,000		1,042,413,000		$ 1,044,440,000
Net earnings attributable to noncontrolling interests			126,837,000
Unrealized gain (loss) on derivative instrument, Net-of-Tax Amount			(1,416,000)
Amount reclassified out of AOCI, net of tax			930,000
Foreign currency translation adjustment, Net-of Tax Amount			(19,543,000)
Total other comprehensive (loss) income, net of tax			(20,029,000)
Total comprehensive income			106,808,000
Payments for Repurchase of Common Stock			(120,637,000)
Stock Issued During Period, Value, Treasury Stock Reissued			114,449,000
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt			(84,140,000)
Payments of Dividends			(23,322,000)
Proceeds from Stock Options Exercised			$ 3,485,000

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) (Details) - USD ($)	Jan. 19, 2016	Jul. 17, 2015	Jan. 19, 2016	Dec. 27, 2015	Dec. 27, 2015	Mar. 31, 2015
Class of Stock [Line Items]
Debt Conversion, Converted Instrument, Shares Issued		1,889,431			1,889,431
Stock Repurchase Program, Authorized Amount				$ 120,000	$ 120,000
Stock Repurchased During Period, Value				180,000
Accelerated Share Repurchase Program, Adjustment					108,100
Accelerated Share Repurchases, Adjustment to Recorded Amount					11,900
Accelerated Share Repurchase Program Other Current Assets				$ 60,000	$ 60,000
Number of shares of common stock purchased				2,000,000	2,009,896
Treasury stock, shares				9,716,516	9,716,516	9,596,051
Minimum
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 120,000	$ 120,000
Maximum
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 180,000	$ 180,000
Subsequent Event [Member] | Accelerated Share Repurchase Agreement [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Shares	961,444		2,961,444
Accelerated Share Repurchases, Final Price Paid Per Share	$ 56.19
January 2016 [Member] | Subsequent Event [Member] | Accelerated Share Repurchase Agreement [Member]
Class of Stock [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt	$ 13,608		$ 13,608
January 1, 2016 to January 19, 2017 [Member] | Subsequent Event [Member] | Accelerated Share Repurchase Agreement [Member]
Class of Stock [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt	$ 166,392		$ 166,392

Stockholders' Equity Redeemable

Stockholders' Equity Redeemable Noncontrolling Interests (Details) $ in Thousands	9 Months Ended
	Dec. 27, 2015USD ($)
Noncontrolling Interest [Abstract]
Beginning balance, redeemable noncontrolling interests	$ 6,956
Net losses attributable to noncontrolling interests	(921)
Foreign Currency Translation Adjustments	(1,211)
Ending balance, redeemable noncontrolling interests	$ 4,824

Earnings Per Share (Reconciliat

Earnings Per Share (Reconciliation from Basic to Diluted Average Common Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 38,478	$ 49,252	$ 126,890	$ 154,737
Basic	44,394,925	45,188,942	44,524,289	46,073,961
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired	581,279	791,739	650,529	898,436
Incremental Common Shares Attributable to Conversion of Debt Securities	0	1,387,492	737,841	1,571,499
Diluted weighted-average number of common shares outstanding	44,976,204	47,368,173	45,912,659	48,543,896
Basic earnings per common share attributable to EnerSys stockholders	$ 0.87	$ 1.09	$ 2.85	$ 3.36
Diluted earnings per common share attributable to EnerSys stockholders	$ 0.86	$ 1.04	$ 2.76	$ 3.19
Anti-dilutive equity awards not included in diluted weighted-average common shares	0	0	0	138

Earnings Per Share (Additional

Earnings Per Share (Additional Information) (Details) - USD ($)	Jan. 19, 2016	Jul. 17, 2015	Jan. 19, 2016	Dec. 27, 2015	Dec. 28, 2014	Dec. 27, 2015	Dec. 28, 2014
Debt Instrument [Line Items]
Incremental Common Shares Attributable to Conversion of Debt Securities				0	1,387,492	737,841	1,571,499
Payment of principal and accreted interest on Convertible Notes		$ 172,388,000				$ 172,266,000	$ 234,000
Number of shares issued from conversion		1,889,431				1,889,431
Stock Repurchase Program, Authorized Amount				$ 120,000		$ 120,000
Stock Repurchased During Period, Value				$ 180,000
Treasury Stock, Shares, Acquired				2,000,000		2,009,896
Accelerated Share Repurchase Program, Adjustment						$ 108,100
Minimum
Debt Instrument [Line Items]
Stock Repurchase Program, Authorized Amount				$ 120,000		120,000
Maximum
Debt Instrument [Line Items]
Stock Repurchase Program, Authorized Amount				$ 180,000		$ 180,000
Accelerated Share Repurchase Agreement [Member] | Subsequent Event [Member]
Debt Instrument [Line Items]
Stock Repurchased and Retired During Period, Shares	961,444		2,961,444

Business Segments (Details)

Business Segments (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 27, 2015USD ($)	Dec. 28, 2014USD ($)	Dec. 27, 2015USD ($)segment	Dec. 28, 2014USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment			3
Total net sales	$ 573,573	$ 611,578	$ 1,704,775	$ 1,875,615
Net sales revenue by services	573,573	611,578	1,704,775	1,875,615
Total intersegment sales	32,076	34,650	103,977	110,020
Total operating earnings	55,461	68,683	184,046	220,425
Restructuring charges	3,204	2,437	7,051	6,076
Gain (Loss) Related to Litigation Settlement			799	16,233
Litigation Settlement, Amount			(3,201)	16,233
Gain on sale of facility			4,348	0
Reserve Power
Segment Reporting Information [Line Items]
Net sales revenue by services	271,948	306,989	810,448	933,888
Motive Power
Segment Reporting Information [Line Items]
Net sales revenue by services	301,625	304,589	894,327	941,727
Americas
Segment Reporting Information [Line Items]
Total net sales	306,331	314,263	945,839	978,376
Total intersegment sales	6,334	11,657	23,041	31,552
Total operating earnings	40,572	40,884	134,344	120,751
Restructuring charges	(865)		(1,435)
Gain (Loss) Related to Litigation Settlement	0	0	799	16,233
Europe
Segment Reporting Information [Line Items]
Total net sales	196,829	242,345	582,896	717,620
Total intersegment sales	17,537	16,433	59,999	51,324
Total operating earnings	16,525	27,805	54,218	79,845
Restructuring charges	(2,153)	(563)	(4,706)	(4,202)
Litigation Settlement, Amount	0		(4,000)
Asia
Segment Reporting Information [Line Items]
Total net sales	70,413	54,970	176,040	179,619
Total intersegment sales	8,205	6,560	20,937	27,144
Total operating earnings	1,568	2,431	1,388	9,672
Restructuring charges	$ (186)	$ (1,874)	(910)	$ (1,874)
Gain on sale of facility			$ 4,348

Subsequent Events Subsequent Ev

Subsequent Events Subsequent Events (Details) - USD ($)	Jan. 28, 2016	Jan. 19, 2016	Jul. 17, 2015	Jan. 19, 2016	Dec. 27, 2015	Dec. 28, 2014
Subsequent Event [Line Items]
Payment of principal and accreted interest on Convertible Notes			$ 172,388,000		$ 172,266,000	$ 234,000
Number of shares issued from conversion			1,889,431		1,889,431
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.175
Accelerated Share Repurchase Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Repurchased and Retired During Period, Shares		961,444		2,961,444
Accelerated Share Repurchases, Final Price Paid Per Share		$ 56.19
January 2016 [Member] | Accelerated Share Repurchase Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ 13,608		$ 13,608
January 1, 2016 to January 19, 2017 [Member] | Accelerated Share Repurchase Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ 166,392		$ 166,392