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Cover Page - shares	6 Months Ended
Cover Page - shares	Sep. 30, 2019	Nov. 01, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 29, 2019
Document Transition Report	false
Entity File Number	001-32253
Entity Registrant Name	EnerSys
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	23-3058564
Entity Address, Address Line One	2366 Bernville Road
Entity Address, City or Town	Reading
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19605
City Area Code	610
Local Phone Number	208-1991
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	ENS
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		42,285,572
Entity Central Index Key	0001289308
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Current assets:
Cash and cash equivalents	$ 424,846	$ 299,212
Accounts receivable, net of allowance for doubtful accounts: September 29, 2019 - $14,296; March 31, 2019 - $10,813	585,106	624,136
Total	507,081	503,869
Prepaid and other current assets	122,777	109,431
Total current assets	1,639,810	1,536,648
Property, plant, and equipment, net	410,750	409,439
Goodwill	649,236	656,399
Other intangible assets, net	446,464	462,316
Deferred taxes	54,412	40,466
Other assets	90,141	12,925
Total assets	3,290,813	3,118,193
Current liabilities:
Short-term debt	34,351	54,490
Accounts payable	276,926	292,449
Accrued expenses	254,362	265,994
Total current liabilities	565,639	612,933
Long-term Debt, Excluding Current Maturities	1,117,818	971,756
Deferred taxes	76,649	82,112
Other liabilities	211,716	165,375
Total liabilities	1,971,822	1,832,176
Commitments and contingencies
Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at September 29, 2019 and at March 31, 2019	0	0
Common Stock, 0.01 par value per share, 135,000,000 shares authorized, 55,085,136 shares issued and 42,281,834 shares outstanding at September 29, 2019; 54,848,523 shares issued and 42,620,750 shares outstanding at March 31, 2019	551	548
Additional paid-in capital	515,598	512,696
Treasury stock at cost, 12,803,302 shares held as of September 29, 2019 and 12,227,773 shares held as of March 31, 2019	(565,108)	(530,760)
Retained earnings	1,546,419	1,450,325
Contra equity - indemnification receivable	(5,838)	(7,840)
Accumulated other comprehensive income	(176,147)	(142,682)
Total EnerSys stockholders' equity	1,315,475	1,282,287
Noncontrolling interests	3,516	3,730
Total equity	1,318,991	1,286,017
Total liabilities and equity	$ 3,290,813	$ 3,118,193

Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 762,137	$ 660,462	$ 1,542,367	$ 1,331,392
Cost of goods sold	564,820	499,582	1,143,538	1,004,652
Inventory adjustment relating to exit activities			0	526
Gross profit	197,317	160,880	398,829	326,214
Operating expenses	132,325	96,402	263,129	195,818
Restructuring, exit and other charges	6,282	1,121	8,654	2,860
Operating earnings	58,710	63,357	127,046	127,536
Interest expense	10,097	6,413	20,995	12,929
Other (income) expense, net	199	(1,325)	(953)	(997)
Earnings before income taxes	48,414	58,269	107,004	115,604
Income (benefit) tax expense	(14,284)	10,822	(4,330)	22,137
Net earnings	$ 62,698	47,447	111,334	93,467
Net earnings attributable to noncontrolling interests		23	0	183
Net earnings attributable to EnerSys stockholders		$ 47,424	$ 111,334	$ 93,284
Net earnings per common share attributable to EnerSys stockholders:
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.48	$ 1.13	$ 2.62	$ 2.22
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	1.47	1.11	2.59	2.19
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175	$ 0.35	$ 0.35
Weighted average shares of common stock outstanding:
Basic weighted-average number of common shares outstanding (in shares)	42,392,039	42,133,484	42,524,189	42,073,015
Diluted weighted-average number of common shares outstanding (in shares)	42,708,082	42,773,706	42,913,258	42,673,844
Nonredeemable Noncontrolling Interest [Member]
Net earnings attributable to noncontrolling interests	$ 0

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 14,296	$ 10,813
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	135,000,000	135,000,000
Common stock, shares issued (in shares)	55,080,346	54,848,523
Common stock, shares outstanding (in shares)	42,281,834	42,620,750
Treasury stock (in shares)	12,803,302	12,227,773

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 62,698	$ 47,447	$ 111,334	$ 93,467
Other comprehensive (loss) income:
Net unrealized gain (loss) on derivative instruments, net of tax	3,586	(6,179)	1,257	(5,174)
Pension funded status adjustment, net of tax	237	300	474	600
Foreign currency translation adjustment	(32,199)	(14,150)	(35,410)	(86,313)
Total other comprehensive loss, net of tax	(28,376)	(20,029)	(33,679)	(90,887)
Total comprehensive income	34,322	27,418	77,655	2,580
Comprehensive loss attributable to noncontrolling interests	(131)	(200)	(214)	(539)
Comprehensive income attributable to EnerSys stockholders	$ 34,453	$ 27,618	$ 77,869	$ 3,119

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net earnings	$ 111,334	$ 93,467
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	41,053	27,302
Write-off of assets relating to exit activities and other	9,969	1,073
Derivatives not designated in hedging relationships:
Net losses	696	622
Cash settlements	(821)	(760)
Provision for doubtful accounts	3,245	132
Deferred income taxes	(20,973)	827
Non-cash interest expense	752	627
Stock-based compensation	8,868	9,129
Gain on disposal of property, plant, and equipment	(119)	(77)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	26,763	(1,556)
Inventories	(11,687)	(21,691)
Prepaid and other current assets	(18,214)	(4,238)
Other assets	4,699	(1,369)
Accounts payable	(22,005)	864
Accrued expenses	(18,576)	(20,624)
Other liabilities	(9,922)	304
Net cash provided by operating activities	105,062	84,032
Cash flows from investing activities
Capital expenditures	(43,378)	(35,500)
Proceeds from disposal of property, plant, and equipment	2,645	189
Net cash used in investing activities	(40,733)	(35,311)
Cash flows from financing activities
Net repayments on short-term debt	(20,019)	(2,854)
Repayments of 2017 Term Loan	(5,645)	0
Option proceeds	25	8,264
Payment of taxes related to net share settlement of equity awards	(6,250)	(3,384)
Purchase of treasury stock	(34,561)	0
Dividends paid to stockholders	(14,898)	(14,747)
Other	161	30
Net cash provided by financing activities	68,813	6,809
Effect of exchange rate changes on cash and cash equivalents	(7,508)	(32,465)
Net increase in cash and cash equivalents	125,634	23,065
Cash and cash equivalents at beginning of period	299,212	522,118
Cash and cash equivalents at end of period	424,846	545,183
Amended Credit Facility, due 2022
Cash flows from financing activities
Proceeds from 2011 Revolver borrowings	285,000	84,500
Repayments of 2011 Revolver borrowings	$ (135,000)	$ (65,000)

Basis of Presentation

6 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

The accompanying unaudited consolidated condensed financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments except those otherwise described herein) considered necessary for a fair presentation have been included, unless otherwise disclosed. Operating results for the three months and six months ended September 29, 2019 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2020.

The Consolidated Condensed Balance Sheet at March 31, 2019 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements.

The financial statements should be read in conjunction with the Consolidated Financial Statements and Notes thereto included in the Company’s 2019 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on May 29, 2019 (the “2019 Annual Report”).

EnerSys (the “Company,”) reports interim financial information for 13-week periods, except for the first quarter, which always begins on April 1, and the fourth quarter, which always ends on March 31. The four quarters in fiscal 2020 end on June 30, 2019, September 29, 2019, December 29, 2019, and March 31, 2020, respectively. The four quarters in fiscal 2019 ended on July 1, 2018, September 30, 2018, December 30, 2018, and March 31, 2019, respectively.

The consolidated condensed financial statements include the accounts of the Company and its wholly-owned subsidiaries and any partially owned subsidiaries that the Company has the ability to control. All intercompany transactions and balances have been eliminated in consolidation.

Recently Adopted Accounting Pronouncements

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842)”, which sets out the principles for the recognition, measurement, presentation and disclosure of leases for both parties to a contract (i.e. lessees and lessors). This update requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. This classification will determine whether the lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. The new standard requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases. Effective April 1, 2019, the Company adopted the new standard under the modified retrospective approach, which resulted in no adjustment to the April 1, 2019 beginning Retained Earnings. There are optional practical expedients and policy elections made available to simplify the transition to the new standard. The Company has elected the following:


•	to adopt the optional transition method defined within ASU 2018-11 and not restate comparative prior periods but instead recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption;


•	the package of three practical expedients addressing whether a contract contains a lease, lease classification and initial direct costs;


•	to combine lease and non-lease components as a single component for all asset classes;


•	to use a portfolio approach to determine the incremental borrowing rate; and


•	to apply the short-term lease exception to leases that, at the commencement date, has a lease term of 12 months or less and does not include an option to purchase the underlying asset that the lessee is reasonably certain to exercise.

Upon adoption, the Company recorded Right-of-use (“ROU”) assets and lease liabilities of approximately $84,878 and $87,248, respectively. In addition, capital lease assets and liabilities are now classified as finance lease right-of-use assets and liabilities. The difference between the operating lease assets and lease liabilities primarily relates to unamortized lease incentives and deferred rent recorded in accordance with the previous lease guidance.

Apart from the aforementioned changes, the adoption of this standard did not have a significant impact on the Company's operating results, financial position or cash flows. The discount rates used to calculate the ROU assets and lease liabilities as of the effective date were based on the remaining lease terms as of the effective date. See Note 3, Leases for additional information.

In August 2017, the FASB issued ASU No. 2017-12, “Derivatives and Hedging (Topic 815)”: Targeted Improvements to Accounting for Hedging Activities, which amends and simplifies existing guidance in order to allow companies to more accurately present the economic effects of risk management activities in the financial statements. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income

statement line as the hedged item. The Company adopted the standard effective April 1, 2019 and the adoption did not have any impact on the Company's operating results, financial position or cash flows.

In February 2018, the FASB issued ASU 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220)". The new standard will allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act (“Tax Act”). The amendments eliminate the stranded tax effects resulting from the Tax Act and will improve the usefulness of information reported to financial statements users. However, because the amendment only relates to the reclassification of the income tax effects of the Tax Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The Company adopted this standard effective April 1, 2019 with the election not to reclassify $478 of stranded tax effects, primarily related to the Company's pension plans, from accumulated other comprehensive income (“AOCI”) to retained earnings, as the amount was not material.

Accounting Pronouncements Issued But Not Adopted as of September 29, 2019

In June 2016, the FASB, issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326)”: Measurement of Credit Losses on Financial Instruments, which changes the recognition model for the impairment of financial instruments, including accounts receivable, loans and held-to-maturity debt securities, among others. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. In contrast to current guidance, which considers current information and events and utilizes a probable threshold, (an “incurred loss” model), ASU 2016–13 mandates an “expected loss” model. The expected loss model: (i) estimates the risk of loss even when risk is remote, (ii) estimates losses over the contractual life, (iii) considers past events, current conditions and reasonable supported forecasts and (iv) has no recognition threshold. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements.

Revenue Recognition	6 Months Ended
Revenue Recognition	Sep. 30, 2019
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition The Company adopted ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)” on April 1, 2018 using the modified retrospective transition method. There was no cumulative effect of adopting the standard at the date of initial application in retained earnings. The Company's revenues by reportable segments are presented in Note 17. Service revenues related to the work performed for the Company’s customers by its maintenance technicians generally represent a separate and distinct performance obligation. Control for these services passes to the customer as the services are performed. Service revenues for the second quarter of fiscal 2020 and fiscal 2019 amounted to $61,282 and $37,105, respectively. Service revenues for the six months of fiscal 2020 and fiscal 2019 amounted to $122,000 and $69,200, respectively. A small portion of the Company's customer arrangements oblige the Company to create customized products for its customers that require the bundling of both products and services into a single performance obligation because the individual products and services that are required to fulfill the customer requirements do not meet the definition for a distinct performance obligation. These customized products generally have no alternative use to the Company and the terms and conditions of these arrangements give the Company the enforceable right to payment for performance completed to date, including a reasonable profit margin. For these arrangements, control transfers over time and the Company measures progress towards completion by selecting the input or output method that best depicts the transfer of control of the underlying goods and services to the customer for each respective arrangement. Methods used by the Company to measure progress toward completion include labor hours, costs incurred and units of production. Revenues recognized over time for the second quarter of fiscal 2020 and fiscal 2019 amounted to $33,595 and $16,491, respectively. Revenues recognized over time for the six months of fiscal 2020 and fiscal 2019 amounted to $75,090 and $34,895, respectively. On September 29, 2019, the aggregate transaction price allocated to unsatisfied (or partially unsatisfied) performance obligations was approximately $65,975, of which, the Company estimates that approximately $48,576 will be recognized as revenue in fiscal 2020, $16,621 in fiscal 2021, $643 in fiscal 2022, $16 in fiscal 2023 and $119 in fiscal 2024. Any payments that are received from a customer in advance, prior to the satisfaction of a related performance obligation and billings in excess of revenue recognized, are deferred and treated as a contract liability. Advance payments and billings in excess of revenue recognized are classified as current or non-current based on the timing of when recognition of revenue is expected. As of September 29, 2019, the current and non-current portion of contract liabilities were $16,543 and $6,808, respectively. As of March 31, 2019, the current and non-current portion of contract liabilities were $15,162 and $6,360, respectively. Revenues recognized during the second quarter of fiscal 2020 and fiscal 2019, that were included in the contract liability at the beginning of the quarter, amounted to $3,690 and $611, respectively. Revenues recognized during the six months of fiscal 2020 and fiscal 2019, that were included in the contract liability at the beginning of the year, amounted to $8,157 and $2,597, respectively. Amounts representing work completed and not billed to customers represent contract assets and were $46,319 and $38,778 as of September 29, 2019 and March 31, 2019, respectively. The Company uses historic customer product return data as a basis of estimation for customer returns and records the reduction of sales at the time revenue is recognized. At September 29, 2019, the right of return asset related to the value of inventory anticipated to be returned from customers was $2,667 and refund liability representing amounts estimated to be refunded to customers was $5,213.

Leases

6 Months Ended

Sep. 30, 2019

Leases [Abstract]

Leases

The Company leases manufacturing facilities, distribution centers, office space, vehicles and other equipment under non-cancellable leases with initial terms typically ranging from 1 to 17 years. At contract inception, the Company reviews the terms of the arrangement to determine if the contract is or contains a lease. Guidance in Topic 842 is used to evaluate whether the contract has an identified asset; if the Company has the right to obtain substantially all economic benefits from the asset; and if it has the right to direct the use of the underlying asset. When determining if a contract has an identified asset, the Company considers both explicit and implicit assets, and whether the supplier has the right to substitute the asset. When determining if the Company has the right to obtain substantially all economic benefits from the asset, the Company considers the primary outputs of the identified asset throughout the period of use and determines if it receives greater than 90% of those benefits. When determining if it has the right to direct the use of an underlying asset, the Company considers if it has the right to direct how and for what purpose the asset is used throughout the period of use and if it controls the decision-making rights over the asset.

Lease terms may include options to extend or terminate the lease. The Company exercises its judgment to determine the term of those leases when extension or termination options are present and include such options in the calculation of the lease term when it is reasonably certain that the Company will exercise those options.

The Company has elected to include both lease and non-lease components in the determination of lease payments for all asset classes. Payments made to a lessor for items such as taxes, insurance, common area maintenance, or other costs commonly referred to as executory costs, are also included in lease payments if they are fixed. The fixed portion of these payments are included in the calculation of the lease liability, while any variable portion would be recognized as variable lease expenses, when incurred. Variable payments made to third parties for these, or similar costs, such as utilities, are not included in the calculation of lease payments.

Both finance and operating leases are reflected as liabilities on the commencement date of the lease based on the present value of the lease payments to be made over the lease term. As most of the leases do not provide an implicit rate, the Company has exercised judgment in electing the incremental borrowing rate based on the information available when the lease commences to determine the present value of future payments. Right-of-use assets are valued at the initial measurement of the lease liability, plus any initial direct costs or rent prepayments and reduced by any lease incentives and any deferred lease payments.

Operating lease expense is recognized on a straight-line basis over the lease term. Finance lease expense includes depreciation, which is recognized on a straight-line basis over the expected life of the leased asset, and interest expense, which is recognized following an effective interest rate method.

Short term leases with an initial term of 12 months or less are not presented on the balance sheet and expense is recognized as incurred.

The following table presents lease assets and liabilities and their balance sheet classification:



	Classification	As of September 29, 2019
Operating Leases:
Right-of-use Assets	Other assets	$	77,259
Operating lease current liabilities	Accrued expenses	22,122
Operating lease non-current liabilities	Other liabilities	57,581
Finance Leases:
Right-of-use Assets	Property, plant, and equipment, net	$	10,724
Finance lease current liabilities	Current portion of debt	10,261
Finance lease non-current liabilities	Non-current portion of debt	493

The components of lease expense for the second quarter and six months ended September 29, 2019 were as follows:



	Classification	Quarter ended September 29, 2019		Six months ended September 29, 2019
Operating Leases:
Operating lease cost	Operating expenses	$	7,260	$	14,555
Variable lease cost	Operating expenses	2,122		3,828
Short term lease cost	Operating expenses	1,927		4,111
Finance Leases:
Depreciation	Operating expenses	$	138	$	281
Interest expense	Interest expense	10		22
Total		$	11,457	$	22,797

The following table presents the weighted average lease term and discount rates for leases as of September 29, 2019:



Operating Leases:
Weighted average remaining lease term (years)		5.41 years
Weighted average discount rate		5.38%
Finance Leases:
Weighted average remaining lease term (years)		3.45 years
Weighted average discount rate		4.93%

The following table presents future payments due under leases reconciled to lease liabilities as of September 29, 2019:



	Finance Leases		Operating Leases
Six months ended March 31, 2020	$	10,195	$	13,770
Year ended March 31,
2021	194		22,752
2022	198		17,436
2023	155		12,390
2024	104		8,264
Thereafter	28		18,526
Total undiscounted lease payments	10,874		93,138
Present value discount	120		13,435
Lease liability	$	10,754	$	79,703

The following table presents supplemental disclosures of cash flow information related to leases for the second quarter and six months ended September 29, 2019:



	Quarter ended September 29, 2019		Six months ended September 29, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$	10	$	22
Operating cash flows from operating leases	7,170		14,383
Financing cash flows from finance leases	138		281
Supplemental non-cash information on lease liabilities arising from right-of-use assets:
Right-of-use assets obtained in exchange for new finance lease liabilities	$	—	$	—
Right-of-use assets obtained in exchange for new operating lease liabilities	2,318		4,946

Leases

Short term leases with an initial term of 12 months or less are not presented on the balance sheet and expense is recognized as incurred.

The following table presents lease assets and liabilities and their balance sheet classification:



	Classification	As of September 29, 2019
Operating Leases:
Right-of-use Assets	Other assets	$	77,259
Operating lease current liabilities	Accrued expenses	22,122
Operating lease non-current liabilities	Other liabilities	57,581
Finance Leases:
Right-of-use Assets	Property, plant, and equipment, net	$	10,724
Finance lease current liabilities	Current portion of debt	10,261
Finance lease non-current liabilities	Non-current portion of debt	493

The components of lease expense for the second quarter and six months ended September 29, 2019 were as follows:



	Classification	Quarter ended September 29, 2019		Six months ended September 29, 2019
Operating Leases:
Operating lease cost	Operating expenses	$	7,260	$	14,555
Variable lease cost	Operating expenses	2,122		3,828
Short term lease cost	Operating expenses	1,927		4,111
Finance Leases:
Depreciation	Operating expenses	$	138	$	281
Interest expense	Interest expense	10		22
Total		$	11,457	$	22,797

The following table presents the weighted average lease term and discount rates for leases as of September 29, 2019:



Operating Leases:
Weighted average remaining lease term (years)		5.41 years
Weighted average discount rate		5.38%
Finance Leases:
Weighted average remaining lease term (years)		3.45 years
Weighted average discount rate		4.93%

The following table presents future payments due under leases reconciled to lease liabilities as of September 29, 2019:



	Finance Leases		Operating Leases
Six months ended March 31, 2020	$	10,195	$	13,770
Year ended March 31,
2021	194		22,752
2022	198		17,436
2023	155		12,390
2024	104		8,264
Thereafter	28		18,526
Total undiscounted lease payments	10,874		93,138
Present value discount	120		13,435
Lease liability	$	10,754	$	79,703

The following table presents supplemental disclosures of cash flow information related to leases for the second quarter and six months ended September 29, 2019:



	Quarter ended September 29, 2019		Six months ended September 29, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$	10	$	22
Operating cash flows from operating leases	7,170		14,383
Financing cash flows from finance leases	138		281
Supplemental non-cash information on lease liabilities arising from right-of-use assets:
Right-of-use assets obtained in exchange for new finance lease liabilities	$	—	$	—
Right-of-use assets obtained in exchange for new operating lease liabilities	2,318		4,946

Acquisitions

6 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Acquisitions

Acquisition

On December 7, 2018, the Company completed the acquisition of all of the issued and outstanding common stock of Alpha Technologies Services, Inc. (“ATS”) and Alpha Technologies Ltd. (“ATL”), resulting in ATS and ATL becoming wholly-owned subsidiaries of the Company (the “share purchase”). Additionally, the Company acquired substantially all of the assets of Alpha Technologies Inc. and certain assets of Altair Advanced Industries, Inc. and other affiliates of ATS and ATL (all such sellers, together with ATS and ATL, “Alpha”), in each case in accordance with the terms and conditions of certain restructuring agreements (collectively, the “asset acquisition” and together with the share purchase, the “acquisition”). Based in Bellingham, Washington, Alpha is a global industry leader in comprehensive commercial-grade energy solutions for broadband, telecom, renewable, industrial and traffic customers around the world. The initial purchase consideration for the acquisition was $750,000, of which $650,000 was paid in cash and the balance was settled by issuing 1,177,630 shares of EnerSys common stock. These shares were issued out of the Company's treasury stock and were valued at $84.92 per share, which was based on the thirty-day volume weighted average stock price of the Company’s common stock at closing, in accordance with the purchase agreement. The 1,177,630 shares had a closing date fair value of $93,268, based upon the December 7, 2018 closing date spot rate of $79.20. The total purchase consideration, consisting of cash paid of $650,000, shares valued at $93,268 and an adjustment for working capital (due post - closing from seller of $766), was $742,502. The Company funded the cash portion of the acquisition with borrowings from the Amended Credit Facility as defined in Note 12. See Note 12 for additional information.

The acquisition expands the Company's footprint in broadband and telecom markets. The goodwill recognized in connection with this transaction reflects the benefits the Company expects to realize from being able to provide a one-stop, fully integrated power solutions offering to its customers, as well as the benefit of cost synergies from alignment of the Alpha group within its own organizational structure.

The results of operations of Alpha have been included in the Company’s Americas segment.

The following table represents the fair values assigned to the assets acquired and liabilities assumed and resulting goodwill. The amounts recognized will be finalized as the information necessary to complete the analysis is obtained, but no later than one year from the acquisition date (“the measurement period”).

The acquired assets and assumed liabilities include the following:



Accounts receivable	$	115,467
Inventories	84,297
Other current assets	6,822
Other intangible assets	332,000
Property, plant and equipment	20,987
Other assets	9,005
Total assets acquired	$	568,578
Accounts payable	35,803
Accrued liabilities	41,918
Deferred income taxes	56,331
Other liabilities	12,642
Total liabilities assumed	$	146,694
Net assets acquired	$	421,884

Purchase price:
Cash paid for net assets acquired	$	650,000
Fair value of shares issued for net assets acquired	93,268
Working capital adjustment	(766		)
Total purchase consideration	742,502
Less: Fair value of acquired identifiable assets and liabilities	421,884
Goodwill	$	320,618

The following table summarizes the estimated fair value of Alpha's identifiable intangible assets and the initial assessment of their respective estimated lives:



	Type	Life in Years	Fair Value
Trademarks	Indefinite-lived	Indefinite	$	56,000
Customer relationships	Finite-lived	14	221,000
Technology	Finite-lived	10	55,000
Total identifiable intangible assets			$	332,000

The Company recorded the acquisition using the acquisition method of accounting and recognized the assets acquired and liabilities assumed at their fair values as of the date of the acquisition. The excess of the purchase price over the net tangible and intangible assets is recorded to goodwill. Estimated goodwill deductible for tax purposes is $42,262. The measurement of the fair value of assets acquired and liabilities assumed is substantially complete. The Company continues to gather necessary information to finalize the accounting for income taxes associated with the acquisition, and as such the Company could record additional adjustments to the provisional amount recognized as this additional information is obtained.

The following unaudited summary information is presented on a consolidated pro forma basis as if the acquisition had occurred on April 1, 2017:



	Quarter ended			Six Months Ended
		September 30, 2018		September 30, 2018
Net sales		$	818,279	$	1,653,571
Net earnings attributable to EnerSys stockholders		61,035		119,748
Net earnings per share attributable to EnerSys stockholders - basic		1.41		2.77
Net earnings per share attributable to EnerSys stockholders - assuming dilution		1.39		2.73

The pro forma amounts include additional interest expense on the debt issued to finance the purchases, amortization and depreciation expense based on the estimated fair value and useful lives of intangible assets and plant assets, and related tax effects. The pro forma results are not necessarily indicative of the combined results had the Alpha acquisition been completed on April 1, 2017, nor are they indicative of future combined results. The remeasurement of Alpha's deferred taxes due to the Tax Act are being excluded in arriving at these pro forma results.

Other Intangible Assets

Information regarding the Company’s other intangible assets are as follows:



	Balance as of
	September 29, 2019							March 31, 2019
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Indefinite-lived intangible assets:
Trademarks	$	152,123	$	(953	)	$	151,170	$	152,484	$	(953	)	$	151,531
Finite-lived intangible assets:
Customer relationships	286,111		(53,690		)	232,421		286,664		(42,704		)	243,960
Non-compete	3,110		(2,804		)	306		3,025		(2,807		)	218
Technology	77,661		(15,819		)	61,842		77,779		(12,229		)	65,550
Trademarks	2,003		(1,278		)	725		2,003		(1,236		)	767
Licenses	1,196		(1,196		)	—		1,477		(1,187		)	290
Total	$	522,204	$	(75,740	)	$	446,464	$	523,432	$	(61,116	)	$	462,316

The Company’s amortization expense related to finite-lived intangible assets was $7,309 and $14,625, for the second quarter and six months of fiscal 2020, respectively, compared to$2,046 and $4,115 for the second quarter and six months of fiscal 2019, respectively. The expected amortization expense based on the finite-lived intangible assets as of September 29, 2019, is $14,866 for the remainder of fiscal 2020, $29,237 in fiscal 2021, $28,993 in fiscal 2022, $27,694 in fiscal 2023 and $24,287 in fiscal 2024.

Contra Equity - Indemnification Receivable

In connection with the Alpha acquisition in fiscal 2019, the Company recorded an unrecognized tax benefit and related indemnification receivable of $7,840. The indemnification receivable represents the Seller’s obligation to indemnify the Company for the outcome of potential contingent liabilities, including those associated with uncertain tax positions. Due to the expiration of certain statutes of limitations during the second quarter of fiscal 2020, a portion of the unrecognized tax benefit was recognized, resulting in a reduction in the indemnification receivable.

Inventories

6 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Inventories

Inventories, net consist of:



	September 29, 2019		March 31, 2019
Raw materials	$	124,761	$	138,718
Work-in-process	105,955		129,736
Finished goods	276,365		235,415
Total	$	507,081	$	503,869

Fair Value of Financial Instruments

6 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Recurring Fair Value Measurements

The following tables represent the financial assets and (liabilities) measured at fair value on a recurring basis as of September 29, 2019 and March 31, 2019, and the basis for that measurement:



	Total Fair Value Measurement September 29, 2019		Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Lead forward contracts	$	701	$	—	$	701	$	—
Foreign currency forward contracts	38		—		38		—
Total derivatives	$	739	$	—	$	739	$	—



	Total Fair Value Measurement March 31, 2019			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Lead forward contracts	$	(902	)	$	—	$	(902	)	$	—
Foreign currency forward contracts	(249		)	—		(249		)	—
Total derivatives	$	(1,151	)	$	—	$	(1,151	)	$	—

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 2019 Annual Report.

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

Financial Instruments

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

The fair value of the Company’s short-term debt and borrowings under the Amended Credit Facility (as defined in Note 12), approximate their respective carrying value, as they are variable rate debt and the terms are comparable to market terms as of the balance sheet dates and are classified as Level 2.

The Company's 5.00% Senior Notes due 2023 (the “Notes”), with an original face value of $300,000, were issued in April 2015. The fair value of the Notes represent the trading values based upon quoted market prices and are classified as Level 2. The Notes were trading at approximately 102% and 99% of face value on September 29, 2019 and March 31, 2019, respectively.

The carrying amounts and estimated fair values of the Company’s derivatives and Notes at September 29, 2019 and March 31, 2019 were as follows:



	September 29, 2019				March 31, 2019
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial assets:
Derivatives ⁽¹⁾	$	739	$	739	$	—	$	—
Financial liabilities:
Notes ⁽²⁾	$	300,000	$	306,000	$	300,000	$	297,000
Derivatives ⁽¹⁾	—		—		1,151		1,151


(1)	Represents lead and foreign currency forward contracts (see Note 7 for asset and liability positions of the lead and foreign currency forward contracts at September 29, 2019 and March 31, 2019).

(2)

The fair value amount of the Notes at September 29, 2019 and March 31, 2019 represent the trading value of the instruments.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Derivative Financial Instruments

6 Months Ended

Sep. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

The Company utilizes derivative instruments to reduce its exposure to fluctuations in commodity prices and foreign exchange rates under established procedures and controls. The Company does not enter into derivative contracts for speculative purposes. The Company’s agreements are with creditworthy financial institutions and the Company anticipates performance by counterparties to these contracts and therefore no material loss is expected.

Derivatives in Cash Flow Hedging Relationships

Lead Forward Contracts

The Company enters into lead forward contracts to fix the price for a portion of its lead purchases. Management considers the lead forward contracts to be effective against changes in the cash flows of the underlying lead purchases. The vast majority of such contracts are for a period not extending beyond one year. At September 29, 2019 and March 31, 2019, the Company has hedged the price to purchase approximately 54.0 million pounds and 42.0 million pounds of lead, respectively, for a total purchase price of $49,938 and $39,218, respectively.

Foreign Currency Forward Contracts

The Company uses foreign currency forward contracts and options to hedge a portion of the Company’s foreign currency exposures for lead, as well as other foreign currency exposures so that gains and losses on these contracts offset changes in the underlying foreign currency denominated exposures. The vast majority of such contracts are for a period not extending beyond one year. As of September 29, 2019 and March 31, 2019, the Company had entered into a total of $45,350 and $42,318, respectively, of such contracts.

In the coming twelve months, the Company anticipates that $1,602 of pretax gain relating to lead and foreign currency forward contracts will be reclassified from AOCI as part of cost of goods sold. This amount represents the current net unrealized impact of hedging lead and foreign exchange rates, which will change as market rates change in the future, and will ultimately be realized in the Consolidated Condensed Statements of Income as an offset to the corresponding actual changes in lead costs to be realized in connection with the variable lead cost and foreign exchange rates being hedged.

Derivatives not Designated in Hedging Relationships

Foreign Currency Forward Contracts

The Company also enters into foreign currency forward contracts to economically hedge foreign currency fluctuations on intercompany loans and foreign currency denominated receivables and payables. These are not designated as hedging instruments and changes in fair value of these instruments are recorded directly in the Consolidated Condensed Statements of Income. As of September 29, 2019 and March 31, 2019, the notional amount of these contracts was $23,676 and $22,201, respectively.

Presented below in tabular form is information on the location and amounts of derivative fair values in the Consolidated Condensed Balance Sheets and derivative gains and losses in the Consolidated Condensed Statements of Income:

Fair Value of Derivative Instruments

September 29, 2019 and March 31, 2019



	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging Instruments
	September 29, 2019		March 31, 2019		September 29, 2019		March 31, 2019
Prepaid and other current assets:
Lead forward contracts	$	701	$	—	$	—	$	—
Foreign currency forward contracts	154		—		—		—
Total assets	$	855	$	—	$	—	$	—
Accrued expenses:
Lead forward contracts	$	—	$	902	$	—	$	—
Foreign currency forward contracts	—		8		116		241
Total liabilities	$	—	$	910	$	116	$	241

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

For the quarter ended September 29, 2019



Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts	$	7,872		Cost of goods sold	$	3,173
Foreign currency forward contracts	(64		)	Cost of goods sold	(63		)
Total	$	7,808			$	3,110



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	(730	)
Total		$	(730	)

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

For the quarter ended September 30, 2018



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



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

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

For the six months ended September 29, 2019



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	$	4,496		Cost of goods sold	$	2,732
Foreign currency forward contracts	(395		)	Cost of goods sold	(280		)
Total	$	4,101			$	2,452



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	$	(696	)
Total		$	(696	)

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

For the six months ended September 30, 2018



Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivative (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts	$	(11,009	)	Cost of goods sold	$	(2,719	)
Foreign currency forward contracts	720			Cost of goods sold	(803		)
Total	$	(10,289	)		$	(3,522	)



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

Income Taxes	6 Months Ended
Income Taxes	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s income tax provision consists of federal, state and foreign income taxes. The tax provision for the second quarter of fiscal 2020 and 2019 was based on the estimated effective tax rates applicable for the full years ending March 31, 2020 and March 31, 2019, respectively, after giving effect to items specifically related to the interim periods. The Company’s effective income tax rate with respect to any period may be volatile based on the mix of income in the tax jurisdictions in which the Company operates, change in tax laws and the amount of the Company's consolidated income before taxes. On May 19, 2019, a public referendum held in Switzerland approved the Federal Act on Tax Reform and AHV (Old-Age and Survivors Insurance) Financing (TRAF) as adopted by the Swiss Federal Parliament on September 28, 2018. The Swiss tax reform measures are effective January 1, 2020. Certain provisions of the TRAF were enacted during the current quarter. Significant changes in the tax reform include the abolishment of preferential tax regimes for holding companies, domicile companies and mixed companies at the cantonal level. The transitional provisions of the TRAF allow companies to elect tax basis adjustments to fair value, which is used for tax depreciation and amortization purposes resulting in a deduction over the transitional period. The Company recorded a deferred tax asset of $21,000 during the second quarter of fiscal 2020, related to the amortizable goodwill, subject to final negotiations with the Swiss federal and cantonal tax authority. The consolidated effective income tax rates for the second quarter of fiscal 2020 and 2019 were (29.5)% and 18.6%, respectively and for the six months of fiscal 2020 and 2019 were (4.0)% and 19.1%, respectively. The rate decrease in the second quarter and six months of fiscal 2020 compared to the comparable prior year periods is primarily due to Swiss tax reform and changes in the mix of earnings among tax jurisdictions. Foreign income as a percentage of worldwide income is estimated to be 72% for fiscal 2020 compared to 68% for fiscal 2019. The foreign effective income tax rates for the six months of fiscal 2020 and 2019 were (2.4)% and 11.1%, respectively. The rate decrease compared to the prior year period is primarily due to Swiss tax reform and 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 was taxed at an effective income tax rate of approximately 6% in both the current and prior year quarter of fiscal 2020 and fiscal 2019.

Warranty

6 Months Ended

Sep. 30, 2019

Product Warranties Disclosures [Abstract]

Warranty

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



	Quarter ended						Six months ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Balance at beginning of period	$	56,179		$	49,689		$	54,568		$	50,602
Current period provisions	6,475			6,181			13,994			11,017
Costs incurred	(7,227		)	(7,920		)	(13,175		)	(12,301		)
Foreign currency translation adjustment	(491		)	(217		)	(451		)	(1,585		)
Balance at end of period	$	54,936		$	47,733		$	54,936		$	47,733

Commitments, Contingencies and Litigation	6 Months Ended
Commitments, Contingencies and Litigation	Sep. 30, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments, Contingencies and Litigation	Commitments, Contingencies and Litigation Litigation and Other Legal Matters In the ordinary course of business, the Company and its subsidiaries are routinely defendants in or parties to pending and threatened legal actions and proceedings, including actions brought on behalf of various classes of claimants. These actions and proceedings are generally based on alleged violations of environmental, anticompetition, employment, contract and other laws. In some of these actions and proceedings, claims for substantial monetary damages are asserted against the Company and its subsidiaries. In the ordinary course of business, the Company and its subsidiaries are also subject to regulatory and governmental examinations, information gathering requests, inquiries, investigations, and threatened legal actions and proceedings. In connection with formal and informal inquiries by federal, state, local and foreign agencies, the Company and its subsidiaries receive numerous requests, subpoenas and orders for documents, testimony and information in connection with various aspects of their activities. European Competition Investigations Certain of the Company’s European subsidiaries had received subpoenas and requests for documents and, in some cases, interviews from, and have had on-site inspections conducted by, the competition authorities of Belgium, Germany and the Netherlands relating to conduct and anticompetitive practices of certain industrial battery participants. The Company settled the Belgian regulatory proceeding in February 2016 by acknowledging certain anticompetitive practices and conduct and agreeing to pay a fine of $1,962, which was paid in March 2016. During the second quarter of fiscal 2019, the Company also paid $1,272 towards certain aspects related to this matter, which are under appeal. As of September 29, 2019 and March 31, 2019, the Company did not have a reserve balance for these matters. In June 2017, the Company settled a portion of its previously disclosed proceeding involving the German competition authority relating to conduct involving the Company's motive power battery business and agreed to pay a fine of $14,811, which was paid in July 2017. As of September 29, 2019 and March 31, 2019, the Company did not have a reserve balance relating to this matter. Also, in March 2019, the Company settled the remaining portion of its previously disclosed proceeding involving the German competition authority relating to conduct involving the Company’s reserve power battery business and agreed to pay a fine of $7,258, which was paid in April 2019. As of September 29, 2019 and March 31, 2019, the Company had a reserve balance of $0 and $7,258, respectively. The foregoing estimate of losses is based upon currently available information for these proceedings. However, the precise scope, timing and time period at issue, as well as the final outcome of the investigations or customer claims, remain uncertain. Accordingly, the Company’s estimate may change from time to time, and actual losses could vary. Environmental Issues As a result of its operations, the Company is subject to various federal, state, and local, as well as international environmental laws and regulations and is exposed to the costs and risks of registering, handling, processing, storing, transporting, and disposing of hazardous substances, especially lead and acid. The Company’s operations are also subject to federal, state, local and international occupational safety and health regulations, including laws and regulations relating to exposure to lead in the workplace. The Company is responsible for certain cleanup obligations at the former Yuasa battery facility in Sumter, South Carolina, that predates its ownership of this facility. This manufacturing facility was closed in 2001 and the Company established a reserve for this facility, which was $1,060 and $1,081 as of September 29, 2019 and March 31, 2019, respectively. Based on current information, the Company’s management believes this reserve is adequate to satisfy the Company’s environmental liabilities at this facility. This facility is separate from the Company’s current metal fabrication facility in Sumter. Lead and Foreign Currency Forward Contracts To stabilize its lead costs and reduce volatility from currency movements, the Company enters into contracts with financial institutions. The vast majority of such contracts are for a period not extending beyond one year. Please refer to Note 7 - Derivative Financial Instruments for more details.

Restructuring Plans

6 Months Ended

Sep. 30, 2019

Restructuring and Related Activities [Abstract]

Restructuring Plans

Restructuring, Exit and Other Charges

Restructuring Plans

During fiscal 2018, the Company announced restructuring programs to improve efficiencies primarily related to supply chain and general operations in EMEA. The Company estimates that the total charges for these actions will amount to approximately $7,400, 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 80 employees upon completion. During fiscal 2018, the Company recorded non-cash restructuring charges of $69 and cash charges of $2,260 and an additional $3,104 during fiscal 2019. The Company incurred $1,350 in costs against the accrual in fiscal 2018 and an additional $2,844 in fiscal 2019. During the six months of fiscal 2020, the Company recorded restructuring charges of $248 and incurred $425 in costs against the accrual. As of September 29, 2019, the reserve balance associated with these actions is $865. The Company expects to be committed to an additional $1,700 in restructuring charges related to this action, which it expects to complete in fiscal 2021.

During fiscal 2019, the Company announced restructuring programs to improve efficiencies of its operations in EMEA. The Company estimates that the total charges for these actions will amount to approximately $2,500, from charges primarily for employee severance-related payments to approximately 35 employees. During fiscal 2019, the Company recorded restructuring charges of $347 and incurred $83 in costs against the accrual. During the six months of fiscal 2020, the Company recorded restructuring charges of $537 and incurred $632 in costs against the accrual. As of September 29, 2019, the reserve balance associated with these actions is $156. The Company expects to complete these actions in fiscal 2021.

During fiscal 2019, the Company announced restructuring programs to improve efficiencies of its operations in the Americas. The Company estimates that the total charges for these actions will amount to approximately $4,100, from cash and non-cash charges primarily for employee severance-related payments to approximately 85 employees. During fiscal 2019, the Company recorded restructuring charges of $1,970, non-cash charges of $2,095 and incurred $1,480 in costs against the accrual. During the six months of fiscal 2020, the Company incurred $484 in costs against the accrual. As of September 29, 2019, the reserve balance associated with this action is $10. The Company expects to complete these actions in fiscal 2020.

During fiscal 2019, the Company announced a restructuring program to improve efficiencies of its operations in Asia and to convert its India operations from mainly reserve power production to motive power production. The Company estimates that the total charges for these actions will amount to approximately $5,300, from cash charges primarily for employee severance-related payments to approximately 150 employees and non-cash charges related to the write-off of fixed assets. During fiscal 2019, the Company recorded cash restructuring charges of $2,772 and non-cash charges of $771 and incurred $1,683 in costs against the accrual. During the six months of fiscal 2020, the Company recorded restructuring charges of $631, non-cash charges of $130 and incurred $1,697 in costs against the accrual. As of September 29, 2019, the reserve balance associated with this action is $70. The Company expects to complete this action in fiscal 2020.

During fiscal 2020, the Company announced a restructuring program to improve efficiencies of its operations in the Americas. The Company estimates that the total charges for these actions will amount to approximately $1,400, from cash charges primarily for employee severance-related payments to approximately 50 employees. During the six months of fiscal 2020, the Company recorded restructuring charges of $1,126 and incurred $687 in costs against the accrual. As of September 29, 2019, the reserve balance associated with this action is $441. The Company expects to complete this action in fiscal 2020.

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



	Employee Severance			Other			Total
Balance as of March 31, 2019	$	2,356		$	596		$	2,952
Accrued	2,369			173			2,542
Costs incurred	(3,229		)	(696		)	(3,925		)
Foreign currency impact	(24		)	(3		)	(27		)
Balance as of September 29, 2019	$	1,472		$	70		$	1,542

Exit Charges

During fiscal 2019, the Company committed to a plan to close its facility in Targovishte, Bulgaria, which produced diesel-electric submarine batteries. Management determined that the future demand for batteries of diesel-electric submarines was not sufficient given the number of competitors in the market. Of the estimated total charges of $30,000 for all these actions, the Company had recorded charges amounting to $20,242 in fiscal 2019, relating to severance and inventory and fixed asset write-offs. The Company recorded an additional $1,325 relating to non-cash charges during the six months of fiscal 2020.

In keeping with its strategy of exiting the manufacture of batteries for diesel-electric submarines, during the second quarter of fiscal 2020, the Company also sold certain licenses and assets for $2,031 and recorded a net gain of $892, which is reported in exit charges.

During the second quarter of fiscal 2020, the Company wrote off $5,441 of assets at its Kentucky and Tennessee plants, as a result of its strategic product mix shift from traditional flooded batteries to maintenance free lead acid and lithium batteries.

During the six months of fiscal 2019, as part of the aforementioned program to convert its India operations from mainly reserve power production to motive power production the Company also recorded a non-cash write-off of reserve power inventories of $526, which was reported in cost of goods sold.

Richmond, Kentucky Plant Fire

On September 19, 2019, a fire broke out in the battery formation area of the Company's Richmond, Kentucky motive power production facility. The Company maintains insurance policies for both property damage and business interruption and is in the early stages of assessing damage. Based on its initial assessment, the Company has written off $1,934 for the damage caused to its fixed assets and inventories. The Company also recorded a receivable of $1,934 related to its initial claims for recovery from its property and casualty insurance carriers.

Debt

6 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Debt

The following summarizes the Company’s long-term debt as of September 29, 2019 and March 31, 2019:



	September 29, 2019				March 31, 2019
	Principal		Unamortized Issuance Costs		Principal		Unamortized Issuance Costs
5.00% Senior Notes due 2023	$	300,000	$	2,185	$	300,000	$	2,497
Amended Credit Facility, due 2022	822,625		2,622		677,315		3,062
	$	1,122,625	$	4,807	$	977,315	$	5,559
Less: Unamortized issuance costs	4,807				5,559
Long-term debt, net of unamortized issuance costs	$	1,117,818			$	971,756

5.00% Senior Notes

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

2017 Credit Facility and Subsequent Amendment

In fiscal 2018, the Company entered into a credit facility (the “2017 Credit Facility”). The 2017 Credit Facility scheduled to mature on September 30, 2022, comprised a $600,000 senior secured revolving credit facility (“2017 Revolver”) and a $150,000 senior secured term loan (“2017 Term Loan”). The Company utilized the borrowings from the 2017 Credit Facility to repay its pre-existing credit facility.

In fiscal 2019, the Company amended the 2017 Credit Facility (as amended, the “Amended Credit Facility”) to fund the Alpha acquisition. The Amended Credit Facility consists of $449,105 senior secured term loans (the “Amended 2017 Term Loan”), including a CAD 133,050 ($99,105) term loan and a $700,000 senior secured revolving credit facility (the “Amended 2017 Revolver”). The amendment resulted in an increase of the 2017 Term Loan and the 2017 Revolver by $299,105 and $100,000, respectively.

As of September 29, 2019, the Company had $389,000 outstanding under the Amended 2017 Revolver and $433,625 under the Amended 2017 Term Loan.

Subsequent to the amendment, the quarterly installments payable on the Amended 2017 Term Loan are $5,645 beginning December 31, 2018, $8,468 beginning December 31, 2019 and $11,290 beginning December 31, 2020 with a final payment of $320,000 on September 30, 2022. The Amended Credit Facility may be increased by an aggregate amount of $325,000 in revolving commitments and / or one or more new tranches of term loans, under certain conditions. Both the Amended 2017 Revolver and the Amended 2017 Term Loan bear interest, at the Company's option, at a rate per annum equal to either (i) the London Interbank Offered Rate (“LIBOR”) or Canadian Dollar Offered Rate (“CDOR”) plus (i) LIBOR plus between 1.25% and 2.00% (currently 1.50% and based on the Company's consolidated net leverage ratio) or (ii) the U.S. Dollar Base Rate (which equals, for any day a fluctuating rate per annum equal to the highest of (a) the Federal Funds Effective Rate plus 0.50%, (b) Bank of America “Prime Rate” and (c) the Eurocurrency Base Rate plus 1%; provided that, if the Base Rate shall be less than zero, such rate shall be deemed zero) (iii) the CDOR Base Rate equal to the higher of (a) Bank of America “Prime Rate” and (b) average 30-day CDOR rate plus 0.50%. Obligations under the Amended 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 Amended Credit Facility and up to 65% of the capital stock of certain of the Company’s foreign subsidiaries that are owned by the Company’s United States subsidiaries.

The Amended Credit Facility allows for up to two temporary increases in the maximum leverage ratio from 3.50x to 4.00x for a four quarter period following an acquisition larger than $250,000. Effective December 7, 2018 through December 27, 2019, the maximum leverage ratio has been increased to 4.00x.

The current portion of the Amended 2017 Term Loan of $33,888 is classified as long-term debt as the Company expects to refinance the future quarterly payments with revolver borrowings under the Amended Credit Facility.

Short-Term Debt

As of September 29, 2019 and March 31, 2019, the Company had $34,351 and $54,490, respectively, of short-term borrowings. The weighted average interest rate on these borrowings was approximately 4% at September 29, 2019 and March 31, 2019.

Letters of Credit

As of September 29, 2019 and March 31, 2019, the Company had standby letters of credit of $4,306 and $3,955, respectively.

Debt Issuance Costs

Amortization expense, relating to debt issuance costs, included in interest expense was $374 and $314, respectively, for the quarters ended September 29, 2019 and September 30, 2018 and $752 and $627 for the six months ended September 29, 2019 and September 30, 2018. Debt issuance costs, net of accumulated amortization, totaled $4,807 and $5,559, respectively, at September 29, 2019 and March 31, 2019.

Available Lines of Credit

As of September 29, 2019 and March 31, 2019, the Company had available and undrawn, under all its lines of credit, $425,615 and $546,960, respectively, including $118,921 and $87,685, respectively, of uncommitted lines of credit as of September 29, 2019 and March 31, 2019.

Retirement Plans

6 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Retirement Plans

The following tables present the components of the Company’s net periodic benefit cost related to its defined benefit pension plans:



	United States Plans						International Plans
	Quarter ended						Quarter ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Service cost	$	—		$	—		$	227		$	252
Interest cost	154			157			364			457
Expected return on plan assets	(114		)	(135		)	(518		)	(535		)
Amortization and deferral	51			36			245			304
Net periodic benefit cost	$	91		$	58		$	318		$	478



	United States Plans						International Plans
	Six months ended						Six months ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Service cost	$	—		$	—		$	462		$	507
Interest cost	308			316			740			927
Expected return on plan assets	(226		)	(257		)	(1,056		)	(1,087		)
Amortization and deferral	103			92			498			616
Net periodic benefit cost	$	185		$	151		$	644		$	963

Stock-Based Compensation	6 Months Ended
Stock-Based Compensation	Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of September 29, 2019, the Company maintains the 2017 Equity Incentive Plan (“2017 EIP”). The 2017 EIP reserved 4,173,554 shares of common stock for the grant of various classes of nonqualified stock options, restricted stock units, market condition-based on total shareholder return (“TSR”) and performance condition-based share units (“PSU”) and other forms of equity-based compensation. The Company recognized stock-based compensation expense associated with its equity incentive plans of $4,994 for the second quarter of fiscal 2020 and $4,788 for the second quarter of fiscal 2019. Stock-based compensation expense was 8,868 for the six months of fiscal 2020 and $9,129 for the six months of fiscal 2019. The Company recognizes compensation expense using the straight-line method over the vesting period of the awards. During the six months of fiscal 2020, the Company granted to non-employee directors 32,460 restricted stock units, pursuant to the 2017 EIP. The awards vest immediately upon the date of grant and are settled in shares of common stock, six months after termination of service as a director. During the six months of fiscal 2020, the Company granted to management and other key employees 284,109 non-qualified stock options that vest ratably over three years from the date of grant, 62,512 PSUs and 51,063 TSRs units that cliff vest three years from the date of grant, and 301,321 restricted stock units that vest ratably over four years from the date of grant. Common stock activity during the six months of fiscal 2020 included the vesting of 162,119 restricted stock units, 171,980 TSRs and the exercise of 661 stock options. As of September 29, 2019, there were 825,153 non-qualified stock options, 888,525 restricted stock units, 207,340 TSRs and 102,006 PSUs outstanding.

Stockholders' Equity and Noncontrolling Interests

6 Months Ended

Sep. 30, 2019

Equity [Abstract]

Stockholders' Equity and Noncontrolling Interests

Stockholders’ Equity and Noncontrolling Interests

Common Stock

The following demonstrates the change in the number of shares of common stock outstanding during the six months ended September 29, 2019:



Shares outstanding as of March 31, 2019	42,620,750
Purchase of treasury stock	(581,140	)
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes	242,224
Shares outstanding as of September 29, 2019	42,281,834

Treasury Stock

During the six months ended September 29, 2019, the Company purchased 581,140 shares for $34,561. At September 29, 2019 and March 31, 2019, the Company held 12,803,302 and 12,227,773 shares as treasury stock, respectively. During the six months ended September 29, 2019, the Company also issued 5,611 shares out of its treasury stock, valued at $62.55 per share, on a LIFO basis, to participants under the Company's Employee Stock Purchase Plan.

Accumulated Other Comprehensive Income (“AOCI ”)

The components of AOCI, net of tax, as of September 29, 2019 and March 31, 2019, are as follows:



	March 31, 2019			Before Reclassifications			Amounts Reclassified from AOCI			September 29, 2019
Pension funded status adjustment	$	(20,791	)	$	—		$	474		$	(20,317	)
Net unrealized (loss) gain on derivative instruments	(130		)	3,129			(1,872		)	1,127
Foreign currency translation adjustment	(121,761		)	(35,196		)	—			(156,957		)
Accumulated other comprehensive (loss) income	$	(142,682	)	$	(32,067	)	$	(1,398	)	$	(176,147	)

The following table presents reclassifications from AOCI during the second quarter ended September 29, 2019:



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	$	(3,110	)	Cost of goods sold
Tax expense	736
Net unrealized gain on derivative instruments, net of tax	$	(2,374	)

Defined benefit pension costs:
Prior service costs and deferrals	$	296		Net periodic benefit cost, included in other (income) expense, net - See Note 13
Tax benefit	(59		)
Net periodic benefit cost, net of tax	$	237

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



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

Defined benefit pension costs:
Prior service costs and deferrals	$	340		Net periodic benefit cost, included in other (income) expense, net - See Note 13
Tax benefit	(40		)
Net periodic benefit cost, net of tax	$	300

The following table presents reclassifications from AOCI during the six months ended September 29, 2019:



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	$	(2,452	)	Cost of goods sold
Tax expense	580
Net unrealized gain on derivative instruments, net of tax	$	(1,872	)

Defined benefit pension costs:
Prior service costs and deferrals	$	601		Net periodic benefit cost, included in other (income) expense, net - See Note 13
Tax benefit	(127		)
Net periodic benefit cost, net of tax	$	474

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



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

Defined benefit pension costs:
Prior service costs and deferrals	$	708		Net periodic benefit cost, included in other (income) expense, net - See Note 13
Tax benefit	(108		)
Net periodic benefit cost, net of tax	$	600

Earnings Per Share

6 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Earnings Per Share

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



	Quarter ended				Six months ended
	September 29, 2019		September 30, 2018		September 29, 2019		September 30, 2018
Net earnings attributable to EnerSys stockholders	$	62,698	$	47,424	$	111,334	93,284
Weighted-average number of common shares outstanding:
Basic	42,392,039		42,133,484		42,524,189		42,073,015
Dilutive effect of:
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired	316,043		640,222		389,069		600,829
Diluted weighted-average number of common shares outstanding	42,708,082		42,773,706		42,913,258		42,673,844
Basic earnings per common share attributable to EnerSys stockholders	$	1.48	$	1.13	$	2.62	$	2.22
Diluted earnings per common share attributable to EnerSys stockholders	$	1.47	$	1.11	$	2.59	$	2.19
Anti-dilutive equity awards not included in diluted weighted-average common shares	1,005,326		409,425		831,068		286,755

Business Segments

6 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Business Segments

The Company's three reportable segments, based on geographic regions, are as follows:


•	Americas, which includes North and South America, with segment headquarters in Reading, Pennsylvania, USA;


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


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

Summarized financial information related to the Company's reportable segments for the second quarter and six months ended September 29, 2019 and September 30, 2018, is shown below:



	Quarter ended						Six months ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Net sales by segment to unaffiliated customers
Americas	$	524,939		$	388,574		$	1,042,049		$	781,148
EMEA	182,803			203,997			386,001			414,491
Asia	54,395			67,891			114,317			135,753
Total net sales	$	762,137		$	660,462		$	1,542,367		$	1,331,392
Net sales by product line
Reserve power	$	426,822		$	313,338		$	862,665		$	637,356
Motive power	335,315			347,124			679,702			694,036
Total net sales	$	762,137		$	660,462		$	1,542,367		$	1,331,392
Intersegment sales
Americas	$	8,864		$	7,888		$	17,428		$	13,746
EMEA	37,842			35,039			74,723			67,126
Asia	5,084			8,055			12,042			15,669
Total intersegment sales ⁽¹⁾	$	51,790		$	50,982		$	104,193		$	96,541
Operating earnings by segment
Americas	$	52,137		$	48,306		$	106,493		$	96,042
EMEA	13,295			13,829			29,006			31,032
Asia	(440		)	2,343			201			3,848
Restructuring charges - Americas	(541		)	—			(1,126		)	—
Restructuring and other exit charges - EMEA	(32		)	(1,007		)	(1,326		)	(2,199		)
Restructuring charges - Asia	(268		)	(114		)	(761		)	(661		)
Inventory adjustment relating to exit activities - Asia	—			—			—			(526		)
Fixed asset write-off relating to exit activities and other - Americas	(5,441		)	—			(5,441		)	—
Total operating earnings ⁽²⁾	$	58,710		$	63,357		$	127,046		$	127,536

(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.

Goodwill

The changes in the carrying amount of goodwill by reportable segment during fiscal 2020 are as follows:



	Americas			EMEA			Asia			Total
Balance at March 31, 2019	$	470,194		$	143,269		$	42,936		$	656,399
Foreign currency translation adjustment	(538		)	(4,732		)	(1,893		)	(7,163		)
Balance as of September 29, 2019	$	469,656		$	138,537		$	41,043		$	649,236

Subsequent Events	6 Months Ended
Subsequent Events	Sep. 30, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 6, 2019, the Board of Directors approved a quarterly cash dividend of $0.175 per share of common stock to be paid on December 27, 2019, to stockholders of record as of December 13, 2019. On September 30, 2019, the Company completed the acquisition of all of the equity of N Holding AB (aka NorthStar) for $78,000 in cash consideration and the assumption of $104,500 in debt, which was funded using existing cash and credit facilities. NorthStar, headquartered in Stockholm, Sweden, through its direct and indirect subsidiaries, manufactures and distributes thin plate pure lead (TPPL) batteries and battery enclosures.

Basis of Presentation (Policies)

6 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

Recently Adopted Accounting Pronouncements and Accounting Pronouncements Issued But Not Yet Adopted

Recently Adopted Accounting Pronouncements


•	to adopt the optional transition method defined within ASU 2018-11 and not restate comparative prior periods but instead recognize a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption;


•	the package of three practical expedients addressing whether a contract contains a lease, lease classification and initial direct costs;


•	to combine lease and non-lease components as a single component for all asset classes;


•	to use a portfolio approach to determine the incremental borrowing rate; and


•	to apply the short-term lease exception to leases that, at the commencement date, has a lease term of 12 months or less and does not include an option to purchase the underlying asset that the lessee is reasonably certain to exercise.

Accounting Pronouncements Issued But Not Adopted as of September 29, 2019

Leases (Tables)

6 Months Ended

Sep. 30, 2019

Leases [Abstract]

Lease, Cost [Table Text Block]

The components of lease expense for the second quarter and six months ended September 29, 2019 were as follows:



	Classification	Quarter ended September 29, 2019		Six months ended September 29, 2019
Operating Leases:
Operating lease cost	Operating expenses	$	7,260	$	14,555
Variable lease cost	Operating expenses	2,122		3,828
Short term lease cost	Operating expenses	1,927		4,111
Finance Leases:
Depreciation	Operating expenses	$	138	$	281
Interest expense	Interest expense	10		22
Total		$	11,457	$	22,797

Lessee, Supplemental Information Related To Leases [Table Text Block]

The following table presents the weighted average lease term and discount rates for leases as of September 29, 2019:



Operating Leases:
Weighted average remaining lease term (years)		5.41 years
Weighted average discount rate		5.38%
Finance Leases:
Weighted average remaining lease term (years)		3.45 years
Weighted average discount rate		4.93%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

The following table presents future payments due under leases reconciled to lease liabilities as of September 29, 2019:



	Finance Leases		Operating Leases
Six months ended March 31, 2020	$	10,195	$	13,770
Year ended March 31,
2021	194		22,752
2022	198		17,436
2023	155		12,390
2024	104		8,264
Thereafter	28		18,526
Total undiscounted lease payments	10,874		93,138
Present value discount	120		13,435
Lease liability	$	10,754	$	79,703

Finance Lease, Liability, Maturity [Table Text Block]

The following table presents future payments due under leases reconciled to lease liabilities as of September 29, 2019:



	Finance Leases		Operating Leases
Six months ended March 31, 2020	$	10,195	$	13,770
Year ended March 31,
2021	194		22,752
2022	198		17,436
2023	155		12,390
2024	104		8,264
Thereafter	28		18,526
Total undiscounted lease payments	10,874		93,138
Present value discount	120		13,435
Lease liability	$	10,754	$	79,703

Lessee, Supplemental Cash Flow Information Related To Leases [Table Text Block]

The following table presents supplemental disclosures of cash flow information related to leases for the second quarter and six months ended September 29, 2019:



	Quarter ended September 29, 2019		Six months ended September 29, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$	10	$	22
Operating cash flows from operating leases	7,170		14,383
Financing cash flows from finance leases	138		281
Supplemental non-cash information on lease liabilities arising from right-of-use assets:
Right-of-use assets obtained in exchange for new finance lease liabilities	$	—	$	—
Right-of-use assets obtained in exchange for new operating lease liabilities	2,318		4,946

Acquisition (Tables)

6 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The acquired assets and assumed liabilities include the following:



Accounts receivable	$	115,467
Inventories	84,297
Other current assets	6,822
Other intangible assets	332,000
Property, plant and equipment	20,987
Other assets	9,005
Total assets acquired	$	568,578
Accounts payable	35,803
Accrued liabilities	41,918
Deferred income taxes	56,331
Other liabilities	12,642
Total liabilities assumed	$	146,694
Net assets acquired	$	421,884

Purchase price:
Cash paid for net assets acquired	$	650,000
Fair value of shares issued for net assets acquired	93,268
Working capital adjustment	(766		)
Total purchase consideration	742,502
Less: Fair value of acquired identifiable assets and liabilities	421,884
Goodwill	$	320,618

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination

The following table summarizes the estimated fair value of Alpha's identifiable intangible assets and the initial assessment of their respective estimated lives:



	Type	Life in Years	Fair Value
Trademarks	Indefinite-lived	Indefinite	$	56,000
Customer relationships	Finite-lived	14	221,000
Technology	Finite-lived	10	55,000
Total identifiable intangible assets			$	332,000

Business Acquisition, Pro Forma Information

The following unaudited summary information is presented on a consolidated pro forma basis as if the acquisition had occurred on April 1, 2017:



	Quarter ended			Six Months Ended
		September 30, 2018		September 30, 2018
Net sales		$	818,279	$	1,653,571
Net earnings attributable to EnerSys stockholders		61,035		119,748
Net earnings per share attributable to EnerSys stockholders - basic		1.41		2.77
Net earnings per share attributable to EnerSys stockholders - assuming dilution		1.39		2.73

Schedule of Intangible Assets

Information regarding the Company’s other intangible assets are as follows:



	Balance as of
	September 29, 2019							March 31, 2019
	Gross Amount		Accumulated Amortization			Net Amount		Gross Amount		Accumulated Amortization			Net Amount
Indefinite-lived intangible assets:
Trademarks	$	152,123	$	(953	)	$	151,170	$	152,484	$	(953	)	$	151,531
Finite-lived intangible assets:
Customer relationships	286,111		(53,690		)	232,421		286,664		(42,704		)	243,960
Non-compete	3,110		(2,804		)	306		3,025		(2,807		)	218
Technology	77,661		(15,819		)	61,842		77,779		(12,229		)	65,550
Trademarks	2,003		(1,278		)	725		2,003		(1,236		)	767
Licenses	1,196		(1,196		)	—		1,477		(1,187		)	290
Total	$	522,204	$	(75,740	)	$	446,464	$	523,432	$	(61,116	)	$	462,316

Inventories (Tables)

6 Months Ended

Sep. 30, 2019

Inventory Disclosure [Abstract]

Summary Of Inventories

Inventories, net consist of:



	September 29, 2019		March 31, 2019
Raw materials	$	124,761	$	138,718
Work-in-process	105,955		129,736
Finished goods	276,365		235,415
Total	$	507,081	$	503,869

Fair Value of Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Financial Assets And (Liabilities), Measured At Fair Value On A Recurring Basis

The following tables represent the financial assets and (liabilities) measured at fair value on a recurring basis as of September 29, 2019 and March 31, 2019, and the basis for that measurement:



	Total Fair Value Measurement September 29, 2019		Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Lead forward contracts	$	701	$	—	$	701	$	—
Foreign currency forward contracts	38		—		38		—
Total derivatives	$	739	$	—	$	739	$	—



	Total Fair Value Measurement March 31, 2019			Quoted Price in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Lead forward contracts	$	(902	)	$	—	$	(902	)	$	—
Foreign currency forward contracts	(249		)	—		(249		)	—
Total derivatives	$	(1,151	)	$	—	$	(1,151	)	$	—

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

The carrying amounts and estimated fair values of the Company’s derivatives and Notes at September 29, 2019 and March 31, 2019 were as follows:



	September 29, 2019				March 31, 2019
	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Financial assets:
Derivatives ⁽¹⁾	$	739	$	739	$	—	$	—
Financial liabilities:
Notes ⁽²⁾	$	300,000	$	306,000	$	300,000	$	297,000
Derivatives ⁽¹⁾	—		—		1,151		1,151


(1)	Represents lead and foreign currency forward contracts (see Note 7 for asset and liability positions of the lead and foreign currency forward contracts at September 29, 2019 and March 31, 2019).


(2)	The fair value amount of the Notes at September 29, 2019 and March 31, 2019 represent the trading value of the instruments.

Derivative Financial Instruments (Tables)

6 Months Ended

Sep. 30, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value of Derivative Instruments

September 29, 2019 and March 31, 2019



	Derivatives and Hedging Activities Designated as Cash Flow Hedges				Derivatives and Hedging Activities Not Designated as Hedging Instruments
	September 29, 2019		March 31, 2019		September 29, 2019		March 31, 2019
Prepaid and other current assets:
Lead forward contracts	$	701	$	—	$	—	$	—
Foreign currency forward contracts	154		—		—		—
Total assets	$	855	$	—	$	—	$	—
Accrued expenses:
Lead forward contracts	$	—	$	902	$	—	$	—
Foreign currency forward contracts	—		8		116		241
Total liabilities	$	—	$	910	$	116	$	241

The Effect Of Derivative Instruments On Consolidated Condensed Statements Of Income

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

For the quarter ended September 29, 2019



Derivatives Designated as Cash Flow Hedges	Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)			Location of Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)
Lead forward contracts	$	7,872		Cost of goods sold	$	3,173
Foreign currency forward contracts	(64		)	Cost of goods sold	(63		)
Total	$	7,808			$	3,110



Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Pretax Gain (Loss)
Foreign currency forward contracts	Other (income) expense, net	$	(730	)
Total		$	(730	)

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

For the quarter ended September 30, 2018



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



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

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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+ Details

Warranty (Tables)

6 Months Ended

Sep. 30, 2019

Product Warranties Disclosures [Abstract]

Analysis Of Changes In Liability For Product Warranties

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



	Quarter ended						Six months ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Balance at beginning of period	$	56,179		$	49,689		$	54,568		$	50,602
Current period provisions	6,475			6,181			13,994			11,017
Costs incurred	(7,227		)	(7,920		)	(13,175		)	(12,301		)
Foreign currency translation adjustment	(491		)	(217		)	(451		)	(1,585		)
Balance at end of period	$	54,936		$	47,733		$	54,936		$	47,733

Restructuring Plans (Tables)

6 Months Ended

Sep. 30, 2019

Restructuring and Related Activities [Abstract]

Reconciliation of Restructuring Reserve

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



	Employee Severance			Other			Total
Balance as of March 31, 2019	$	2,356		$	596		$	2,952
Accrued	2,369			173			2,542
Costs incurred	(3,229		)	(696		)	(3,925		)
Foreign currency impact	(24		)	(3		)	(27		)
Balance as of September 29, 2019	$	1,472		$	70		$	1,542

Debt (Tables)

6 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Long-Term Debt And Capital Lease Obligations

The following summarizes the Company’s long-term debt as of September 29, 2019 and March 31, 2019:



	September 29, 2019				March 31, 2019
	Principal		Unamortized Issuance Costs		Principal		Unamortized Issuance Costs
5.00% Senior Notes due 2023	$	300,000	$	2,185	$	300,000	$	2,497
Amended Credit Facility, due 2022	822,625		2,622		677,315		3,062
	$	1,122,625	$	4,807	$	977,315	$	5,559
Less: Unamortized issuance costs	4,807				5,559
Long-term debt, net of unamortized issuance costs	$	1,117,818			$	971,756

Retirement Plans (Tables)

6 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Net Periodic Benefit Cost Related To Defined Benefit Pension Plans

The following tables present the components of the Company’s net periodic benefit cost related to its defined benefit pension plans:



	United States Plans						International Plans
	Quarter ended						Quarter ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Service cost	$	—		$	—		$	227		$	252
Interest cost	154			157			364			457
Expected return on plan assets	(114		)	(135		)	(518		)	(535		)
Amortization and deferral	51			36			245			304
Net periodic benefit cost	$	91		$	58		$	318		$	478



	United States Plans						International Plans
	Six months ended						Six months ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Service cost	$	—		$	—		$	462		$	507
Interest cost	308			316			740			927
Expected return on plan assets	(226		)	(257		)	(1,056		)	(1,087		)
Amortization and deferral	103			92			498			616
Net periodic benefit cost	$	185		$	151		$	644		$	963

Stockholders' Equity and Noncontrolling Interests (Tables)

6 Months Ended

Sep. 30, 2019

Equity [Abstract]

Change In Number Of Shares Of Common Stock Outstanding

The following demonstrates the change in the number of shares of common stock outstanding during the six months ended September 29, 2019:



Shares outstanding as of March 31, 2019	42,620,750
Purchase of treasury stock	(581,140	)
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes	242,224
Shares outstanding as of September 29, 2019	42,281,834

Components Of Accumulated Other Comprehensive Income

The components of AOCI, net of tax, as of September 29, 2019 and March 31, 2019, are as follows:



	March 31, 2019			Before Reclassifications			Amounts Reclassified from AOCI			September 29, 2019
Pension funded status adjustment	$	(20,791	)	$	—		$	474		$	(20,317	)
Net unrealized (loss) gain on derivative instruments	(130		)	3,129			(1,872		)	1,127
Foreign currency translation adjustment	(121,761		)	(35,196		)	—			(156,957		)
Accumulated other comprehensive (loss) income	$	(142,682	)	$	(32,067	)	$	(1,398	)	$	(176,147	)

Reclassification from Accumulated Other Comprehensive Income

The following table presents reclassifications from AOCI during the second quarter ended September 29, 2019:



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	$	(3,110	)	Cost of goods sold
Tax expense	736
Net unrealized gain on derivative instruments, net of tax	$	(2,374	)

Defined benefit pension costs:
Prior service costs and deferrals	$	296		Net periodic benefit cost, included in other (income) expense, net - See Note 13
Tax benefit	(59		)
Net periodic benefit cost, net of tax	$	237

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



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

Defined benefit pension costs:
Prior service costs and deferrals	$	340		Net periodic benefit cost, included in other (income) expense, net - See Note 13
Tax benefit	(40		)
Net periodic benefit cost, net of tax	$	300

The following table presents reclassifications from AOCI during the six months ended September 29, 2019:



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	$	(2,452	)	Cost of goods sold
Tax expense	580
Net unrealized gain on derivative instruments, net of tax	$	(1,872	)

Defined benefit pension costs:
Prior service costs and deferrals	$	601		Net periodic benefit cost, included in other (income) expense, net - See Note 13
Tax benefit	(127		)
Net periodic benefit cost, net of tax	$	474

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



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

Defined benefit pension costs:
Prior service costs and deferrals	$	708		Net periodic benefit cost, included in other (income) expense, net - See Note 13
Tax benefit	(108		)
Net periodic benefit cost, net of tax	$	600

Earnings Per Share (Tables)

6 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares



	Quarter ended				Six months ended
	September 29, 2019		September 30, 2018		September 29, 2019		September 30, 2018
Net earnings attributable to EnerSys stockholders	$	62,698	$	47,424	$	111,334	93,284
Weighted-average number of common shares outstanding:
Basic	42,392,039		42,133,484		42,524,189		42,073,015
Dilutive effect of:
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired	316,043		640,222		389,069		600,829
Diluted weighted-average number of common shares outstanding	42,708,082		42,773,706		42,913,258		42,673,844
Basic earnings per common share attributable to EnerSys stockholders	$	1.48	$	1.13	$	2.62	$	2.22
Diluted earnings per common share attributable to EnerSys stockholders	$	1.47	$	1.11	$	2.59	$	2.19
Anti-dilutive equity awards not included in diluted weighted-average common shares	1,005,326		409,425		831,068		286,755

Business Segments Business Segments (Tables)

6 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Selected Financial Data for Reportable Business Segments and Product Lines

Summarized financial information related to the Company's reportable segments for the second quarter and six months ended September 29, 2019 and September 30, 2018, is shown below:



	Quarter ended						Six months ended
	September 29, 2019			September 30, 2018			September 29, 2019			September 30, 2018
Net sales by segment to unaffiliated customers
Americas	$	524,939		$	388,574		$	1,042,049		$	781,148
EMEA	182,803			203,997			386,001			414,491
Asia	54,395			67,891			114,317			135,753
Total net sales	$	762,137		$	660,462		$	1,542,367		$	1,331,392
Net sales by product line
Reserve power	$	426,822		$	313,338		$	862,665		$	637,356
Motive power	335,315			347,124			679,702			694,036
Total net sales	$	762,137		$	660,462		$	1,542,367		$	1,331,392
Intersegment sales
Americas	$	8,864		$	7,888		$	17,428		$	13,746
EMEA	37,842			35,039			74,723			67,126
Asia	5,084			8,055			12,042			15,669
Total intersegment sales ⁽¹⁾	$	51,790		$	50,982		$	104,193		$	96,541
Operating earnings by segment
Americas	$	52,137		$	48,306		$	106,493		$	96,042
EMEA	13,295			13,829			29,006			31,032
Asia	(440		)	2,343			201			3,848
Restructuring charges - Americas	(541		)	—			(1,126		)	—
Restructuring and other exit charges - EMEA	(32		)	(1,007		)	(1,326		)	(2,199		)
Restructuring charges - Asia	(268		)	(114		)	(761		)	(661		)
Inventory adjustment relating to exit activities - Asia	—			—			—			(526		)
Fixed asset write-off relating to exit activities and other - Americas	(5,441		)	—			(5,441		)	—
Total operating earnings ⁽²⁾	$	58,710		$	63,357		$	127,046		$	127,536

(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.

fiscal 2020 are as follows:



	Americas			EMEA			Asia			Total
Balance at March 31, 2019	$	470,194		$	143,269		$	42,936		$	656,399
Foreign currency translation adjustment	(538		)	(4,732		)	(1,893		)	(7,163		)
Balance as of September 29, 2019	$	469,656		$	138,537		$	41,043		$	649,236

Basis of Presentation - (Additional Information) (Details) $ in Thousands	Apr. 01, 2019 USD ($)
Accounting Standards Update 2016-02
Revenue from External Customer [Line Items]
Right-of-use asset	$ 84,878
Lease liability	87,248
Accounting Standards Update 2018-02
Revenue from External Customer [Line Items]
Stranded tax effects not reclassified	$ 478

Revenue Recognition - (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 762,137	$ 660,462	$ 1,542,367	$ 1,331,392
Remaining performance obligation	65,975		65,975
Contract with customer, liability, current portion	16,543		16,543		$ 15,162
Contract with customer, liability, noncurrent portion	6,808		6,808		6,360
Deferred Revenue, Revenue Recognized	3,690	611	8,157	2,597
Unbilled contracts receivable	46,319		46,319		$ 38,778
Right to recover product	2,667		2,667
Refund liability	5,213		5,213
Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	33,595	16,491	75,090	34,895
Service
Disaggregation of Revenue [Line Items]
Net sales	$ 61,282	$ 37,105	$ 122,000	$ 69,200

Revenue Recognition - (Remaining Performance Obligation) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 65,975
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-30
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 48,576
Remaining performance obligation, timing of satisfaction	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 16,621
Remaining performance obligation, timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 643
Remaining performance obligation, timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 119
Remaining performance obligation, timing of satisfaction	1 year

Leases - (Additional Information) (Details)	Sep. 30, 2019
Minimum
Lessee, Lease, Description [Line Items]
Contract term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Contract term	17 years

Leases - (Balance Sheet Classification) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use asset	$ 77,259
Operating lease current liabilities	22,122
Operating lease non-current liabilities	57,581
Finance lease right-of-use asset	10,724
Finance lease current liabilities	10,261
Finance lease non-current liabilities	$ 493

Leases - (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Leases - (Lease Cost) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2019
Operating Leases:
Operating lease cost	$ 7,260	$ 14,555
Variable lease cost	2,122	3,828
Short term lease cost	1,927	4,111
Finance Leases:
Depreciation	138	281
Interest expense	10	22
Total	$ 11,457	$ 22,797

Leases - (Additional Information Related to Leases) (Details)	Sep. 30, 2019
Operating Leases:
Weighted average remaining lease term (years)	5 years 4 months 28 days
Weighted average discount rate	5.38%
Finance Leases:
Weighted average remaining lease term (years)	3 years 5 months 12 days
Weighted average discount rate	4.93%

Leases - (Finance and Operating Lease Maturity Schedules) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Finance Leases
Six months ended March 31, 2020	$ 10,195
Year ended March 31, 2021	194
Year ended March 31, 2022	198
Year ended March 31, 2023	155
Year ended March 31, 2024	104
Thereafter	28
Total undiscounted lease payments	10,874
Present value discount	120
Lease liability	10,754
Operating Leases
Six months ended March 31, 2020	13,770
Year ended March 31, 2021	22,752
Year ended March 31, 2022	17,436
Year ended March 31, 2023	12,390
Year ended March 31, 2024	8,264
Thereafter	18,526
Total undiscounted lease payments	93,138
Present value discount	13,435
Lease liability	$ 79,703

Leases - (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from finance leases	$ 10	$ 22
Operating cash flows from operating leases	7,170	14,383
Financing cash flows from finance leases	138	281
Supplemental non-cash information on lease liabilities arising from right-of-use assets:
Right-of-use assets obtained in exchange for new finance lease liabilities	0	0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 2,318	$ 4,946

Acquisitions - (Additional Information) (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 07, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Business Acquisition [Line Items]
Closing day spot rate (USD per share)	$ 79.20
Amortization of intangible assets		$ 7,309	$ 2,046	$ 14,625	$ 4,115
Amortization of intangible assets, remainder of 2020		14,866		14,866
Amortization of intangible assets, 2021		29,237		29,237
Amortization of intangible assets, 2022		28,993		28,993
Amortization of intangible assets, 2023		27,694		27,694
Amortization of intangible assets, 2024		24,287		24,287
Alpha
Business Acquisition [Line Items]
Initial purchase consideration	$ 750,000
Consideration transferred	742,502
Estimated tax-deductible goodwill		$ 42,262		42,262
Payments to acquire businesses	650,000
Shares issued in acquisition, value	93,268
Working capital adjustment	$ 766
Shares issued in acquisition (USD per share)	$ 84.92
Unrecognized Tax Benefits, Increase Resulting from Acquisition						$ 7,840
Alpha \| Customer relationships
Business Acquisition [Line Items]
Acquired intangible assets				221,000
Trademarks \| Alpha
Business Acquisition [Line Items]
Acquired indefinite-lived intangible assets				$ 56,000
Common Stock \| Alpha
Business Acquisition [Line Items]
Shares issued in acquisition (in shares)	1,177,630

Acquisitions - (Assets and Liabilities Acquired) (Details) - USD ($) $ in Thousands	Dec. 07, 2018	Sep. 30, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 649,236	$ 656,399
Alpha
Business Acquisition [Line Items]
Accounts receivable	$ 115,467
Inventories	84,297
Other current assets	6,822
Other intangible assets	332,000	$ 332,000
Property, plant and equipment	20,987
Other assets	9,005
Total assets acquired	568,578
Accounts payable	35,803
Accrued liabilities	41,918
Deferred income taxes	56,331
Other liabilities	12,642
Total liabilities assumed	146,694
Net assets acquired	421,884
Cash paid for net assets acquired	650,000
Shares issued in acquisition, value	93,268
Working capital adjustment	(766)
Consideration transferred	742,502
Goodwill	$ 320,618

Acquisitions - (Summary of Intangible Assets) (Details) - Alpha - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Dec. 07, 2018
Business Acquisition [Line Items]
Other intangible assets	$ 332,000	$ 332,000
Customer relationships
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	14 years
Acquired intangible assets	$ 221,000
Technology
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
Acquired intangible assets	$ 55,000
Trademarks
Business Acquisition [Line Items]
Acquired indefinite-lived intangible assets	$ 56,000

Acquisitions - (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Net sales	$ 818,279
Net earnings attributable to EnerSys stockholders	$ 61,035
Net earnings per share attributable to EnerSys stockholders - basic	$ 1,410
Net earnings per share attributable to EnerSys stockholders - assuming dilution	$ 1,390
Alpha
Business Acquisition [Line Items]
Net sales		$ 1,653,571
Net earnings attributable to EnerSys stockholders		$ 119,748
Net earnings per share attributable to EnerSys stockholders - basic		$ 2,770
Net earnings per share attributable to EnerSys stockholders - assuming dilution		$ 2,730

Acquisitions - (Other Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross amount	$ 522,204	$ 523,432
Total intangible assets, accumulated amortization	(75,740)	(61,116)
Total intangible assets, net amount	446,464	462,316
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	286,111	286,664
Finite-lived intangible assets, accumulated amortization	(53,690)	(42,704)
Finite-lived intangible assets, net amount	232,421	243,960
Non-compete
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	3,110	3,025
Finite-lived intangible assets, accumulated amortization	(2,804)	(2,807)
Finite-lived intangible assets, net amount	306	218
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	77,661	77,779
Finite-lived intangible assets, accumulated amortization	(15,819)	(12,229)
Finite-lived intangible assets, net amount	61,842	65,550
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross amount	152,123	152,484
Indefinite-lived intangible assets, accumulated amortization	(953)	(953)
Indefinite-lived intangible assets, net amount	151,170	151,531
Finite-lived intangible assets, gross amount	2,003	2,003
Finite-lived intangible assets, accumulated amortization	(1,278)	(1,236)
Finite-lived intangible assets, net amount	725	767
Licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	1,196	1,477
Finite-lived intangible assets, accumulated amortization	(1,196)	(1,187)
Finite-lived intangible assets, net amount	$ 0	$ 290

Inventories - (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 124,761	$ 138,718
Work-in-process	105,955	129,736
Finished goods	276,365	235,415
Total	$ 507,081	$ 503,869

Fair Value of Financial Instruments - (Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ 739	$ (1,151)
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	739	(1,151)
Lead forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	701	(902)
Lead forward contracts \| Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	701	(902)
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	38	(249)
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	$ 38	$ (249)

Fair Value of Financial Instruments - (Additional Information) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Face value of trades, percentage	102.00%	99.00%
5.00% Senior Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	5.00%
Long-term debt	$ 300,000

Fair Value of Financial Instruments - (Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	$ 739	$ 0
Notes	300,000	300,000
Derivative liability	0	1,151
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	739	0
Notes	306,000	297,000
Derivative liability	$ 0	$ 1,151

Derivative Financial Instruments - (Additional Information) (Details) $ in Thousands, lb in Millions	6 Months Ended
	Sep. 30, 2019 USD ($) lb	Mar. 31, 2019 USD ($) lb
Cost of Sales
Derivatives, Fair Value [Line Items]
Foreign currency cash flow hedge loss to be reclassified during next 12 months	$ 1,602
Lead forward contracts
Derivatives, Fair Value [Line Items]
Notional amount in pounds \| lb	54.0	42.0
Fair value of hedges, net	$ 49,938	$ 39,218
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Notional amount	45,350	42,318
Foreign currency forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Notional amount	$ 23,676	$ 22,201
Maximum \| Lead forward contracts
Derivatives, Fair Value [Line Items]
Derivative, remaining maturity	1 year

Derivative Financial Instruments - (Location and Amounts of Derivative Fair Values) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019
Derivatives and Hedging Activities Designated as Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	$ 855	$ 0
Derivatives liabilities, fair value	0	910
Derivatives and Hedging Activities Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	0	0
Derivatives liabilities, fair value	116	241
Foreign currency forward contracts \| Derivatives and Hedging Activities Designated as Cash Flow Hedges \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	154	0
Foreign currency forward contracts \| Derivatives and Hedging Activities Designated as Cash Flow Hedges \| Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	0	8
Foreign currency forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	0	0
Foreign currency forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments \| Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	116	241
Lead forward contracts \| Derivatives and Hedging Activities Designated as Cash Flow Hedges \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	701	0
Lead forward contracts \| Derivatives and Hedging Activities Designated as Cash Flow Hedges \| Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	0	902
Lead forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments \| Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivatives assets, fair value	0	0
Lead forward contracts \| Derivatives and Hedging Activities Not Designated as Hedging Instruments \| Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	$ 0	$ 0

Derivative Financial Instruments - (Derivatives Designated as Cash Flow Hedges) (Details) - Derivatives Designated as Cash Flow Hedges - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ 7,808	$ (11,386)	$ 4,101	$ (10,289)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	3,110	(3,308)	2,452	(3,522)
Lead forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	7,872	(11,524)	4,496	(11,009)
Lead forward contracts \| Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	3,173	(3,742)	2,732	(2,719)
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(64)	138	(395)	720
Foreign currency forward contracts \| Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ (63)	$ 434	$ (280)	$ (803)

Derivative Financial Instruments - (Derivatives Not Designated as Hedging Instruments) (Details) - Derivatives Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ (730)	$ 96	$ (696)	$ (622)
Foreign currency forward contracts \| Other Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ (730)	$ 96	$ (696)	$ (622)

Income Taxes - (Additional Information) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Goodwill and Intangible Assets	$ 21,000,000		$ 21,000,000
Effective income tax rates	(29.50%)	18.60%
Foreign income as a percentage or worldwide income			$ 0.72	$ 0.68
Foreign effective income tax rates			(2.40%)	11.10%
Tax rate of Swiss subsidiary	6.00%	6.00%

Warranty - (Analysis of Changes in the Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Product Warranties Disclosures [Abstract]
Balance at beginning of period	$ 56,179	$ 49,689	$ 54,568	$ 50,602
Current period provisions	6,475	6,181	13,994	11,017
Costs incurred	(7,227)	(7,920)	(13,175)	(12,301)
Foreign currency translation adjustment	(491)	(217)	(451)	(1,585)
Balance at end of period	$ 54,936	$ 47,733	$ 54,936	$ 47,733

Commitments, Contingencies and Litigation - (Additional Information) (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended	12 Months Ended
	Apr. 30, 2019	Jun. 30, 2017	Feb. 29, 2016	Sep. 30, 2019	Mar. 31, 2019
Commitments, Contingencies And Litigation [Line Items]
Provision for environmental liabilities				$ 1,060	$ 1,081
Belgium Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations			$ 1,962	1,272
Germany Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations		$ 14,811
Reserves for anti-competition investigations				$ 0	$ 7,258
Litigation Settlement, Amount Awarded to Other Party	$ 7,258

Restructuring Plans - (Additional Information) (Details) $ in Thousands		3 Months Ended			6 Months Ended		12 Months Ended
	Sep. 19, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) Employee	Sep. 30, 2018 USD ($)	Mar. 31, 2019 USD ($) Employee	Mar. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other					$ 9,969	$ 1,073
Restructuring and other exit (credits)		$ 6,282		$ 1,121	8,654	2,860
Restructuring costs incurred					3,925
Restructuring reserve		1,542			1,542		$ 2,952
EMEA
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)		32		1,007	1,326	2,199
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other								$ 7,400
Expected reduction in number of employees \| Employee							80
Restructuring and other exit (credits)					248
Restructuring costs incurred					425		$ 2,844	1,350
Restructuring reserve		865			865
Expected additional restructuring charges		1,700			1,700
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)								69
EMEA \| Restructurings Related to Improving Efficiency Related to Supply Chain and General Operations \| Cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)							3,104	$ 2,260
EMEA \| Restructurings Related to Improving Efficiencies of General Operations in the Americas
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other							$ 2,500
Expected reduction in number of employees \| Employee							35
Restructuring and other exit (credits)							$ 347
Restructuring costs incurred					632		83
Restructuring reserve		156			156
EMEA \| Restructurings Related to Improving Efficiencies of General Operations in the Americas \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					537
Americas
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)		541		0	1,126	0
Americas \| Restructurings Related to Improving Efficiencies of General Operations in the Americas
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other							$ 4,100
Expected reduction in number of employees \| Employee							85
Restructuring and other exit (credits)							$ 1,970
Restructuring costs incurred					484		1,480
Restructuring reserve		10			10
Americas \| Restructurings Related to Improving Efficiencies of General Operations in the Americas \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)							2,095
Americas \| Second Restructuring Related to Improving Efficiencies of General Operations
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other					$ 1,400
Expected reduction in number of employees \| Employee					50
Restructuring and other exit (credits)					$ 1,126
Restructuring costs incurred					687
Restructuring reserve		441			441
Asia
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)		268		114	761	$ 661
Asia \| Restructurings Related to Improving Efficiencies of Reserve Power Operations in EMEA
Restructuring Cost and Reserve [Line Items]
Write-off of assets relating to exit activities and other							$ 5,300
Expected reduction in number of employees \| Employee							150
Restructuring and other exit (credits)					631		$ 2,772
Restructuring costs incurred					1,697		1,683
Restructuring reserve		70			70
Asia \| Restructurings Related to Improving Efficiencies of Reserve Power Operations in EMEA \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					130		771
Asia \| Restructuring Related to Improving Profitability in India \| Non-cash charges
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)				$ 526
Closure Of Facility In Targovishte Bulgaria
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)					$ 1,325		20,242
Expected remaining cost							$ 30,000
Strategy To Exit Manufacture Of Batteries For Diesel-Electric Submarines
Restructuring Cost and Reserve [Line Items]
Proceeds from Sale of Productive Assets		2,031
Gain (Loss) on Disposition of Assets		$ 892
Fixed Asset Write-Off, Kentucky And Tennessee Plants
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)			$ 5,441
Richmond Kentucky Battery Formation Area Fire
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit (credits)	$ 1,934
Prepaid Insurance	$ 1,934

Restructuring Plans - (Roll-forward of Restructuring Reserve) (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 2,952
Accrued	2,542
Costs incurred	(3,925)
Foreign currency impact	(27)
Restructuring reserve, ending balance	1,542
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	2,356
Accrued	2,369
Costs incurred	(3,229)
Foreign currency impact	(24)
Restructuring reserve, ending balance	1,472
Other
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	596
Accrued	173
Costs incurred	(696)
Foreign currency impact	(3)
Restructuring reserve, ending balance	$ 70

Debt - (Long-term Debt Including Capital Lease Obligations) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Mar. 31, 2019	Apr. 23, 2015
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 1,122,625	$ 977,315
Unamortized Issuance Costs	4,807	5,559
Long-term debt, net of unamortized issuance costs	1,117,818	971,756
5.00% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt	300,000	300,000	$ 300,000
Unamortized Issuance Costs	2,185	2,497
Secured Debt \| Incremental Commitment Agreement \| Amended Credit Facility, due 2022
Debt Instrument [Line Items]
Incremental term loan commitment	822,625	677,315
Unamortized Issuance Costs	$ 2,622	$ 3,062

Debt - (Additional Information) (Details)		3 Months Ended		6 Months Ended
Debt - (Additional Information) (Details)	Aug. 04, 2017 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2019 CAD ($)	Mar. 31, 2019 USD ($)	Apr. 23, 2015 USD ($)
Debt Instrument [Line Items]
Increase in borrowing capacity limit	$ 325,000,000
Company owned capital stock, percentage securing senior secured credit facility	65.00%
Short-term debt		$ 34,351,000		$ 34,351,000			$ 54,490,000
Short-term debt, weighted average interest rate		4.00%		4.00%
Amortization expense relating to debt issuance costs and included in interest expense		$ 374,000	$ 314,000	$ 752,000	$ 627,000
Deferred issuance costs, net of accumulated amortization		4,807,000		4,807,000			5,559,000
5.00% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt		300,000,000		300,000,000			300,000,000	$ 300,000,000
Interest rate								5.00%
Standby Letters of Credit
Debt Instrument [Line Items]
Available lines of credit		425,615,000		425,615,000			546,960,000
Stand by letters of credit		3,955,000		3,955,000
Outstanding amount		118,921,000		118,921,000			87,685,000
Maximum
Debt Instrument [Line Items]
Consideration transferred				250,000
Amended Credit Facility, due 2022 \| Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 600,000,000						100,000,000
Available lines of credit		389,000,000		389,000,000
Amended Credit Facility, due 2022 \| Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							299,105,000
Debt instrument, face amount	$ 150,000,000
Available lines of credit		433,625,000		433,625,000
Current portion of long-term debt		$ 33,888,000		$ 33,888,000
Amended 2017 Term Loan \| Term Loan
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							99,105,000
Amended 2017 Term Loan \| Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity						$ 133,050,000	449,105,000
Amended 2017 Revolver \| Secured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 700,000,000
LIBOR \| 2017 Revolver And 2017 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate	1.50%
LIBOR \| 2017 Revolver And 2017 Term Loan \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
LIBOR \| 2017 Revolver And 2017 Term Loan \| Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%
Federal Funds Effective Rate \| 2017 Revolver And 2017 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Eurocurrency Base Rate \| 2017 Revolver And 2017 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Debt Instrument Quarterly Installments Beginning December 31, 2018 Through December 30, 2019
Debt Instrument [Line Items]
Debt instrument, periodic payment	$ 5,645,000
Debt Instrument Quarterly Installments Beginning December 31, 2019 Through December 30, 2020
Debt Instrument [Line Items]
Debt instrument, periodic payment	8,468,000
Debt Instrument Quarterly Installments Beginning December 31, 2020 Through September 29, 2022
Debt Instrument [Line Items]
Debt instrument, periodic payment	11,290,000
Debt Instrument Final Installments Payable On September 30, 2022
Debt Instrument [Line Items]
Debt instrument, periodic payment	$ 320,000,000
Maximum Leverage Ratio
Debt Instrument [Line Items]
Debt Instrument, Measurement Input		4.00		4.00
Maximum Leverage Ratio \| Minimum
Debt Instrument [Line Items]
Debt Instrument, Measurement Input		3.50		3.50
Maximum Leverage Ratio \| Maximum
Debt Instrument [Line Items]
Debt Instrument, Measurement Input		4.00		4.00

Retirement Plans - (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	154	157	308	316
Expected return on plan assets	(114)	(135)	(226)	(257)
Amortization and deferral	51	36	103	92
Net periodic benefit cost	91	58	185	151
International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	227	252	462	507
Interest cost	364	457	740	927
Expected return on plan assets	(518)	(535)	(1,056)	(1,087)
Amortization and deferral	245	304	498	616
Net periodic benefit cost	$ 318	$ 478	$ 644	$ 963

Stock-Based Compensation - (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for future grants	4,173,554		4,173,554
Equity-based compensation expense	$ 4,994	$ 4,788	$ 8,868	$ 9,129
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock and restricted stock units (in shares)			162,119
RSUs and PSUs outstanding (in shares)	888,525		888,525
Market Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs and PSUs outstanding (in shares)	207,340		207,340
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised (in shares)			661
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs and PSUs outstanding (in shares)	102,006		102,006
Non-employee Directors [Member] \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			32,460
Non-employee Directors [Member] \| Market Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			171,980
Management And Other Key Employees [Member] \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			301,321
Management And Other Key Employees [Member] \| Market Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			51,063
Management And Other Key Employees [Member] \| Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants outstanding (in shares)	825,153		825,153
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross			284,109
Management And Other Key Employees [Member] \| Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			62,512

Stockholders' Equity and Noncontrolling Interests - (Change in the Number of Shares of Common Stock Outstanding) (Details)	6 Months Ended
	Sep. 30, 2019 shares
Common Stock Outstanding Roll Forward
Shares outstanding, beginning balance (in shares)	42,620,750
Purchase of treasury stock (in shares)	581,140
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes (in shares)	242,224
Shares outstanding, ending balance (in shares)	42,281,834

Stockholders' Equity and Noncontrolling Interests - (Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Equity [Abstract]
Purchase of treasury stock (in shares)	581,140
Treasury stock purchased during period, value	$ 34,561	$ 0
Treasury stock (in shares)	12,803,302		12,227,773
Treasury shares issued (in shares)	5,611
Treasury shares issued (in dollars per share)	$ 62.55

Stockholders' Equity and Noncontrolling Interests - (Components of Accumulated Other Comprehensive Income) (Details) $ in Thousands	6 Months Ended
	Sep. 30, 2019 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	$ 1,286,017
Ending balance	1,318,991
Pension funded status adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	20,791
Before Reclassifications	0
Amounts Reclassified from AOCI	(474)
Ending balance	20,317
Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(130)
Before Reclassifications	(3,129)
Amounts Reclassified from AOCI	(1,872)
Ending balance	1,127
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(121,761)
Before Reclassifications	35,196
Amounts Reclassified from AOCI	0
Ending balance	(156,957)
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(142,682)
Before Reclassifications	(32,067)
Amounts Reclassified from AOCI	(1,398)
Ending balance	$ (176,147)

Stockholders' Equity and Noncontrolling Interests - (Reclassifications from AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net unrealized gain on derivative instruments	$ (564,820)	$ (499,582)	$ (1,143,538)	$ (1,004,652)
Derivatives in cash flow hedging relationships
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense (benefit)	736	(777)	580	(827)
Net of tax	(2,374)	2,531	(1,872)	2,695
Derivatives in cash flow hedging relationships \| Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net unrealized gain on derivative instruments	(3,110)	3,308	(2,452)	3,522
Defined benefit pension costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs and deferrals	296	340	601	708
Tax expense (benefit)	(59)	(40)	(127)	(108)
Net of tax	$ 237	$ 300	$ 474	$ 600

- (Other Disclosures) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Sep. 30, 2018	Jul. 01, 2018	Sep. 30, 2019	Sep. 30, 2018
Condensed Financial Statements, Captions [Line Items]
Beginning balance	$ 1,296,573	$ 1,286,017	$ 1,176,435	$ 1,201,111	$ 1,286,017	$ 1,201,111
Stock-based compensation	4,994	3,874	4,788	4,341
Exercise of stock options	(13)	38	1,469	6,797
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(169)	(6,081)	69	(3,453)
Purchase of common stock	(11,532)	(23,029)
Other		(80)	(1)	(152)
Net earnings	62,698	48,636	47,447	46,020
Dividends ($0.70 per common share)	(7,399)	(7,499)	(7,376)	(7,371)
Reissuance of treasury stock towards employee stock purchase plan	213
Contra equity - indemnification receivable for acquisition related tax liability	2,002
Other comprehensive income:
Pension funded status adjustment, net of tax	237	237	300	300	474	600
Net unrealized gain (loss) on derivative instruments, net of tax	3,586	(2,329)	(6,179)	1,005	1,257	(5,174)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	(32,199)	(3,211)	(14,150)	(72,163)	(35,410)	(86,313)
Ending balance	$ 1,318,991	$ 1,296,573	$ 1,202,802	$ 1,176,435	$ 1,318,991	$ 1,202,802
Dividends per common share (in dollars per share)	$ 0.175	$ 0.7	$ 0.175	$ 0.175	$ 0.35	$ 0.35
Pension funded status adjustment, tax benefit (expense)	$ 59	$ 68	$ 40	$ 68
Net unrealized gain (loss) on derivative instruments, tax (benefit) expense	(1,112)	720	1,899	(306)
Preferred Stock
Condensed Financial Statements, Captions [Line Items]
Beginning balance	0	0	0	0	$ 0	$ 0
Other comprehensive income:
Ending balance	0	0	0	0	0	0
Common Stock
Condensed Financial Statements, Captions [Line Items]
Beginning balance	551	548	548	546	548	546
Exercise of stock options		3		2
Other comprehensive income:
Ending balance	551	551	548	548	551	548
Additional Paid-in Capital
Condensed Financial Statements, Captions [Line Items]
Beginning balance	510,577	512,696	484,960	477,288	512,696	477,288
Stock-based compensation	4,994	3,874	4,788	4,341
Exercise of stock options	(13)	35	1,469	6,795
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(169)	(6,081)	69	(3,453)
Other		(80)	(1)	(152)
Dividends ($0.70 per common share)	209	133	187	141
Other comprehensive income:
Ending balance	515,598	510,577	491,472	484,960	515,598	491,472
Treasury Stock
Condensed Financial Statements, Captions [Line Items]
Beginning balance	(553,789)	(530,760)	(560,991)	(560,991)	(530,760)	(560,991)
Purchase of common stock	(11,532)	(23,029)
Reissuance of treasury stock towards employee stock purchase plan	213
Other comprehensive income:
Ending balance	(565,108)	(553,789)	(560,991)	(560,991)	(565,108)	(560,991)
Retained Earnings
Condensed Financial Statements, Captions [Line Items]
Beginning balance	1,491,329	1,450,325	1,358,897	1,320,549	1,450,325	1,320,549
Net earnings	62,698	48,636	47,424	45,860
Dividends ($0.70 per common share)	(7,608)	(7,632)	(7,563)	(7,512)
Other comprehensive income:
Ending balance	1,546,419	1,491,329	1,398,758	1,358,897	1,546,419	1,398,758
Accumulated Other Comprehensive Income (Loss)
Condensed Financial Statements, Captions [Line Items]
Beginning balance	(147,902)	(142,682)	(112,076)	(41,717)	(142,682)	(41,717)
Other comprehensive income:
Pension funded status adjustment, net of tax	237	237	300	300
Net unrealized gain (loss) on derivative instruments, net of tax	3,586	(2,329)	(6,179)	1,005
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	(32,068)	(3,128)	(13,927)	(71,664)
Ending balance	(176,147)	(147,902)	(131,882)	(112,076)	(176,147)	(131,882)
Contra-Equity
Condensed Financial Statements, Captions [Line Items]
Beginning balance	(7,840)	(7,840)	0	0	(7,840)	0
Contra equity - indemnification receivable for acquisition related tax liability	2,002
Other comprehensive income:
Ending balance	(5,838)	(7,840)	0	0	(5,838)	0
Total EnerSys Stockholders’ Equity
Condensed Financial Statements, Captions [Line Items]
Beginning balance	1,292,926	1,282,287	1,171,338	1,195,675	1,282,287	1,195,675
Stock-based compensation	4,994	3,874	4,788	4,341
Exercise of stock options	(13)	38	1,469	6,797
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(169)	(6,081)	69	(3,453)
Purchase of common stock	(11,532)	(23,029)
Other		(80)	(1)	(152)
Net earnings	62,698	48,636	47,424	45,860
Dividends ($0.70 per common share)	(7,399)	(7,499)	(7,376)	(7,371)
Reissuance of treasury stock towards employee stock purchase plan	213
Contra equity - indemnification receivable for acquisition related tax liability	2,002
Other comprehensive income:
Pension funded status adjustment, net of tax	237	237	300	300
Net unrealized gain (loss) on derivative instruments, net of tax	3,586	(2,329)	(6,179)	1,005
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	(32,068)	(3,128)	(13,927)	(71,664)
Ending balance	1,315,475	1,292,926	1,197,905	1,171,338	1,315,475	1,197,905
Non- redeemable Non- Controlling Interests
Condensed Financial Statements, Captions [Line Items]
Beginning balance	3,647	3,730	5,097	5,436	3,730	5,436
Net earnings			23	160
Other comprehensive income:
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	(131)	(83)	(223)	(499)
Ending balance	$ 3,516	$ 3,647	$ 4,897	$ 5,097	$ 3,516	$ 4,897

Earnings Per Share - (Reconciliation from Basic to Diluted Average Common Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders		$ 47,424	$ 111,334	$ 93,284
Basic weighted-average number of common shares outstanding (in shares)	42,392,039	42,133,484	42,524,189	42,073,015
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	316,043	640,222	389,069	600,829
Diluted weighted-average number of common shares outstanding (in shares)	42,708,082	42,773,706	42,913,258	42,673,844
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.48	$ 1.13	$ 2.62	$ 2.22
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.47	$ 1.11	$ 2.59	$ 2.19
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	1,005,326	409,425	831,068	286,755
Redeemable Noncontrolling Interest [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders	$ 62,698

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

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

+ References + Details

Business Segments - (Details) $ in Thousands	3 Months Ended		6 Months Ended
Business Segments - (Details) $ in Thousands	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| segment			3
Net sales	$ 762,137	$ 660,462	$ 1,542,367	$ 1,331,392
Intersegment sales	51,790	50,982	104,193	96,541
Operating earnings by segment	58,710	63,357	127,046	127,536
Restructuring charges	(6,282)	(1,121)	(8,654)	(2,860)
Energy Systems
Segment Reporting Information [Line Items]
Net sales	426,822	313,338	862,665	637,356
Motive Power
Segment Reporting Information [Line Items]
Net sales	335,315	347,124	679,702	694,036
Americas
Segment Reporting Information [Line Items]
Net sales	524,939	388,574	1,042,049	781,148
Intersegment sales	8,864	7,888	17,428	13,746
Operating earnings by segment	52,137	48,306	106,493	96,042
Restructuring charges	(541)	0	(1,126)	0
Americas \| Fixed Asset Write-Off
Segment Reporting Information [Line Items]
Restructuring charges	(5,441)	0	(5,441)	0
EMEA
Segment Reporting Information [Line Items]
Net sales	182,803	203,997	386,001	414,491
Intersegment sales	37,842	35,039	74,723	67,126
Operating earnings by segment	13,295	13,829	29,006	31,032
Restructuring charges	(32)	(1,007)	(1,326)	(2,199)
Asia
Segment Reporting Information [Line Items]
Net sales	54,395	67,891	114,317	135,753
Intersegment sales	5,084	8,055	12,042	15,669
Operating earnings by segment	(440)	2,343	201	3,848
Restructuring charges	(268)	(114)	(761)	(661)
Asia \| Inventory Adjustment
Segment Reporting Information [Line Items]
Restructuring charges	$ 0	$ 0	$ 0	$ (526)

Business Segments - (Goodwill) (Details) $ in Thousands	6 Months Ended
Business Segments - (Goodwill) (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Balance at March 31, 2019	$ 656,399
Foreign currency translation adjustment	(7,163)
Balance as of September 29, 2019	649,236
Americas
Segment Reporting Information [Line Items]
Balance at March 31, 2019	470,194
Foreign currency translation adjustment	(538)
Balance as of September 29, 2019	469,656
EMEA
Segment Reporting Information [Line Items]
Balance at March 31, 2019	143,269
Foreign currency translation adjustment	(4,732)
Balance as of September 29, 2019	138,537
Asia
Segment Reporting Information [Line Items]
Balance at March 31, 2019	42,936
Foreign currency translation adjustment	(1,893)
Balance as of September 29, 2019	$ 41,043

Subsequent Events - (Details) - USD ($)	Nov. 06, 2019	Sep. 30, 2019
Subsequent Event
Subsequent Event [Line Items]
Common stock dividends (in dollars per share)	$ 0.175
N Holding AB [Member]
Subsequent Event [Line Items]
Payments to acquire businesses		$ 78,000
Debt assumed		$ 104,500