EnerSys (ENS) 10-Q 12 Nov 20 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Oct. 04, 2020	Nov. 06, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Oct. 4, 2020
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		42,577,285
Entity Central Index Key	0001289308
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

Consolidated Condensed Statemen

Consolidated Condensed Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Net sales	$ 708,402	$ 762,137	$ 1,413,326	$ 1,542,367
Cost of goods sold	530,842	564,820	1,060,789	1,143,538
Gross profit	177,560	197,317	352,537	398,829
Operating expenses	119,026	132,325	239,396	263,129
Restructuring and other exit charges	3,119	6,282	4,506	8,654
Operating earnings	55,415	58,710	108,635	127,046
Interest expense	9,829	10,097	19,994	20,995
Other (income) expense, net	4,110	199	5,572	(953)
Earnings before income taxes	41,476	48,414	83,069	107,004
Income tax expense (benefit)	5,745	(14,284)	12,155	(4,330)
Net earnings	$ 35,731	62,698	70,914	111,334
Net earnings attributable to EnerSys stockholders		$ 62,698	$ 70,914	$ 111,334
Net earnings per common share attributable to EnerSys stockholders:
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.84	$ 1.48	$ 1.67	$ 2.62
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	0.83	1.47	1.65	2.59
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)	42,521,659	42,392,039	42,453,774	42,524,189
Diluted weighted-average number of common shares outstanding (in shares)	43,087,455	42,708,082	43,009,755	42,913,258

Consolidated Condensed Balance

Consolidated Condensed Balance Sheets - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Current assets:
Cash and cash equivalents	$ 414,232	$ 326,979
Accounts receivable, net of allowance for doubtful accounts: October 4, 2020 - $13,317; March 31, 2020 - $15,246	499,781	595,873
Total	516,589	519,460
Prepaid and other current assets	133,473	120,593
Total current assets	1,564,075	1,562,905
Property, plant, and equipment, net	498,662	480,014
Goodwill	689,048	663,936
Other intangible assets, net	443,998	455,685
Deferred taxes	59,122	55,803
Other assets	78,317	83,355
Total assets	3,333,222	3,301,698
Current liabilities:
Short-term debt	31,813	46,544
Accounts payable	252,667	281,873
Accrued expenses	282,374	271,902
Total current liabilities	566,854	600,319
Long-term debt, net of unamortized debt issuance costs	1,039,208	1,104,731
Deferred taxes	79,491	78,363
Other liabilities	212,589	214,223
Total liabilities	1,898,142	1,997,636
Commitments and contingencies
Equity:
Preferred Stock, $0.01 par value, 1,000,000 shares authorized, no shares issued or outstanding at October 4, 2020 and at March 31, 2020	0	0
Common Stock, 0.01 par value per share, 135,000,000 shares authorized, 55,361,826 shares issued and 42,575,193 shares outstanding at October 4, 2020; 55,114,808 shares issued and 42,323,305 shares outstanding at March 31, 2020	554	551
Additional paid-in capital	537,092	529,100
Treasury stock at cost, 12,786,633 shares held as of October 4, 2020 and 12,791,503 shares held as of March 31, 2020	(563,853)	(564,376)
Retained earnings	1,612,640	1,556,980
Contra equity - indemnification receivable	(5,273)	(6,724)
Accumulated other comprehensive income	(149,769)	(215,006)
Total EnerSys stockholders' equity	1,431,391	1,300,525
Noncontrolling interests	3,689	3,537
Total equity	1,435,080	1,304,062
Total liabilities and equity	$ 3,333,222	$ 3,301,698

Consolidated Condensed Balanc_2

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 13,317	$ 15,246
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)	55,361,826	55,114,808
Common stock, shares outstanding (in shares)	42,575,193	42,323,305
Treasury stock (in shares)	12,786,633	12,791,503

Consolidated Condensed Statem_2

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 35,731	$ 62,698	$ 70,914	$ 111,334
Other comprehensive income (loss):
Net unrealized gain on derivative instruments, net of tax	1,470	3,586	3,813	1,257
Pension funded status adjustment, net of tax	305	237	596	474
Foreign currency translation adjustment	32,833	(32,199)	60,980	(35,410)
Total other comprehensive income (loss), net of tax	34,608	(28,376)	65,389	(33,679)
Total comprehensive income	70,339	34,322	136,303	77,655
Comprehensive gain (loss) attributable to noncontrolling interests	144	(131)	152	(214)
Comprehensive income attributable to EnerSys stockholders	$ 70,195	$ 34,453	$ 136,151	$ 77,869

Consolidated Condensed Statem_3

Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019
Cash flows from operating activities
Net earnings	$ 70,914	$ 111,334
Adjustments to reconcile net earnings to net cash provided by operating activities:
Depreciation and amortization	47,059	41,053
Write-off of assets relating to exit activities	1,753	9,969
Derivatives not designated in hedging relationships:
Net (gains) losses	(372)	696
Cash proceeds (settlements)	846	(821)
Provision for doubtful accounts	182	3,245
Deferred income taxes	(1,820)	(20,973)
Non-cash interest expense	1,036	752
Stock-based compensation	10,586	8,868
Loss (gain) on disposal of property, plant, and equipment	156	(119)
Changes in assets and liabilities, net of effects of acquisitions:
Accounts receivable	106,581	26,763
Inventories	21,080	(11,687)
Prepaid and other current assets	7,369	(18,214)
Other assets	3,132	4,699
Accounts payable	(49,557)	(22,005)
Accrued expenses	1,282	(18,576)
Other liabilities	(2,954)	(9,922)
Net cash provided by operating activities	217,273	105,062
Cash flows from investing activities
Capital expenditures	(39,905)	(43,378)
Proceeds from disposal of property, plant, and equipment	81	2,645
Net cash used in investing activities	(39,824)	(40,733)
Cash flows from financing activities
Net repayments on short-term debt	(16,502)	(20,019)
Repayments of 2017 Term Loan	(16,837)	(5,645)
Option proceeds	1,766	25
Payment of taxes related to net share settlement of equity awards	(4,602)	(6,250)
Purchase of treasury stock	0	(34,561)
Dividends paid to stockholders	(14,879)	(14,898)
Other	255	161
Net cash (used in) provided by financing activities	(105,799)	68,813
Effect of exchange rate changes on cash and cash equivalents	15,603	(7,508)
Net increase in cash and cash equivalents	87,253	125,634
Cash and cash equivalents at beginning of period	326,979	299,212
Cash and cash equivalents at end of period	414,232	424,846
Amended Credit Facility, due 2022
Cash flows from financing activities
Proceeds from borrowings	45,000	285,000
Repayments of 2017 Revolver borrowings	$ (100,000)	$ (135,000)

Basis of Presentation

Basis of Presentation	6 Months Ended
	Oct. 04, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated condensed financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments except those otherwise described herein) considered necessary for a fair presentation have been included, unless otherwise disclosed. Operating results for the three and six months ended October 4, 2020 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2021. The Consolidated Condensed Balance Sheet at March 31, 2020 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 2020 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on June 1, 2020 (the “2020 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 2021 end on July 5, 2020, October 4, 2020, January 3, 2021, and March 31, 2021, respectively. The four quarters in fiscal 2020 ended on June 30, 2019, September 29, 2019, December 29, 2019, and March 31, 2020, 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 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 adopted the standard effective April 1, 2020 and the adoption did not have a material impact on the Company's operating results, financial position or cash flows. However, the adoption resulted in the modification of the Company's policies for accounts receivable. The Company estimates the allowance for credit losses in relation to accounts receivable based on relevant qualitative and quantitative information about historical events, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported accounts receivable. Subsequent to April 1, 2020, accounts receivable are recorded at amortized cost less an allowance for expected credit losses. The Company maintains an allowance for credit losses for the expected failure or inability of its customers to make required payments. The Company recognizes the allowance for expected credit losses at inception and reassesses quarterly, based on management’s expectation of the asset’s collectability. The allowance is based on multiple factors including historical experience with bad debts, the credit quality of the customer base, the aging of such receivables and current macroeconomic conditions, as well as management’s expectations of conditions in the future. The Company’s allowance for uncollectible accounts receivable is based on management’s assessment of the collectability of assets pooled together with similar risk characteristics. The Company then adjusts the historical credit loss percentage by current and forecasted economic conditions. The Company then includes a baseline credit loss percentage into the historical credit loss percentage for each aging category to reflect the potential impact of the current and economic conditions. Such a baseline calculation will be adjusted further if changes in the economic environment impacts the Company's expectation for future credit losses. The following table sets forth the quarterly changes in the Company's allowance for doubtful accounts: Allowance for doubtful accounts: Balance at Beginning of Period Provision Write-offs, net of recoveries and other Balance at First quarter ended July 5, 2020 $ 15,246 $ 96 $ (2,113) $ 13,229 Second quarter ended October 4, 2020 $ 13,229 $ 86 $ 2 $ 13,317 In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848)”: Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides temporary optional expedients to ease the financial reporting burdens of the expected market transition from London Interbank Offered Rate (LIBOR) to an alternative reference rate such as Secured Overnight Financing Rate (SOFR). The Company’s agreements with respect to its borrowings already contain comparable alternative reference rates that would automatically take effect upon the phasing out of LIBOR. The Company has adopted the standard and the adoption did not have a material impact on the Company's consolidated financial statements. Accounting Pronouncements Issued But Not Adopted as of October 4, 2020 In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740)”: Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These estimates and assumptions take into account historical and forward looking factors that the Company believes are reasonable, including, but not limited to, the potential impacts arising from the coronavirus pandemic of 2019 (“COVID-19”) and public and private sector policies and initiatives aimed at reducing its transmission. As the extent and duration of the impacts of COVID-19 remain unclear, the Company’s estimates and assumptions may evolve as conditions change. Actual results could differ significantly from those estimates. Examples of significant estimates include the allowance for credit losses, the recoverability of property, plant and equipment, the incremental borrowing rate for lease liabilities, the recoverability of intangible assets and other long-lived assets, fair value measurements, including those related to financial instruments, goodwill and intangible assets, valuation allowances on tax assets, pension and postretirement benefit obligations, contingencies and the identification and valuation of assets acquired and liabilities assumed in connection with business combinations.

Revenue Recognition

Revenue Recognition	6 Months Ended
	Oct. 04, 2020
Revenue from Contract with Customer [Abstract]
Revenue Recognition	Revenue Recognition 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 2021 and 2020 amounted to $74,327 and $61,282, respectively. Service revenues for the six months of fiscal 2021 and 2020 amounted to $143,085 and $122,000, respectively. A small portion of the Company's customer arrangements obligate 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 2021 and 2020 amounted to $35,074 and $33,595, respectively. Revenues recognized over time for the six months of fiscal 2021 and 2020 amounted to $71,176 and $75,090, respectively. On October 4, 2020, the aggregate transaction price allocated to unsatisfied (or partially unsatisfied) performance obligations was approximately $104,552, of which, the Company estimates that approximately $53,781 will be recognized as revenue in fiscal 2021, $36,990 in fiscal 2022, $12,388 in fiscal 2023, $1,359 in fiscal 2024 and $34 in fiscal 2025. 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 October 4, 2020, the current and non-current portion of contract liabilities were $17,871 and $6,383, respectively. As of March 31, 2020, the current and non-current portion of contract liabilities were $17,342 and $8,356, respectively. Revenues recognized during the second quarter of fiscal 2021 and 2020 that were included in the contract liability at the beginning of the year, amounted to $4,175 and $3,690, respectively. Revenues recognized during the six months of fiscal 2021 and 2020 that were included in the contract liability at the beginning of the year, amounted to $7,641 and $8,157, respectively. Amounts representing work completed and not billed to customers represent contract assets and were $49,769 and $39,048 as of October 4, 2020 and March 31, 2020, 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 October 4, 2020, the right of return asset related to the value of inventory anticipated to be returned from customers was $4,267 and refund liability representing amounts estimated to be refunded to customers was $7,034.

Leases

Leases	6 Months Ended
	Oct. 04, 2020
Leases [Abstract]
Leases	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. 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 As of Operating Leases: Right-of-use assets Other assets $ 67,072 $ 70,045 Operating lease current liabilities Accrued expenses 21,511 21,128 Operating lease non-current liabilities Other liabilities 47,787 51,215 Finance Leases: Right-of-use assets Property, plant, and equipment, net $ 574 $ 540 Finance lease current liabilities Accrued expenses 193 162 Finance lease non-current liabilities Other liabilities 415 407 The components of lease expense for the second quarter and six months ended October 4, 2020 and September 29, 2019 were as follows: Quarter ended Six months ended Classification October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Operating Leases: Operating lease cost Operating expenses $ 6,745 $ 7,260 $ 13,681 $ 14,555 Variable lease cost Operating expenses 1,613 2,122 3,732 3,828 Short term lease cost Operating expenses 1,578 1,927 3,406 4,111 Finance Leases: Depreciation Operating expenses $ 46 $ 138 $ 88 $ 281 Interest expense Interest expense 7 10 14 22 Total $ 9,989 $ 11,457 $ 20,921 $ 22,797 The following table presents the weighted average lease term and discount rates for leases as of October 4, 2020: Operating Leases: Weighted average remaining lease term 6 years Weighted average discount rate 5.35% Finance Leases: Weighted average remaining lease term 3.3 years Weighted average discount rate 4.95% The following table presents future payments due under leases reconciled to lease liabilities as of October 4, 2020: Finance Leases Operating Leases Six months ended March 31, 2021 $ 109 $ 12,839 Year ended March 31, 2022 217 21,638 2023 174 14,669 2024 120 9,190 2025 25 5,828 Thereafter 14 16,654 Total undiscounted lease payments 659 80,818 Present value discount 51 11,520 Lease liability $ 608 $ 69,298 The following table presents supplemental disclosures of cash flow information related to leases for the second quarter and six months ended October 4, 2020 and September 29, 2019: Quarter ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Operating cash flows from finance leases $ 7 $ 10 $ 14 $ 22 Operating cash flows from operating leases 6,739 7,170 13,660 14,383 Financing cash flows from finance leases 45 138 86 281 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 $ 87 $ — $ 87 $ — Right-of-use assets obtained in exchange for new operating lease liabilities 955 2,318 7,132 4,946
Leases	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. 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 As of Operating Leases: Right-of-use assets Other assets $ 67,072 $ 70,045 Operating lease current liabilities Accrued expenses 21,511 21,128 Operating lease non-current liabilities Other liabilities 47,787 51,215 Finance Leases: Right-of-use assets Property, plant, and equipment, net $ 574 $ 540 Finance lease current liabilities Accrued expenses 193 162 Finance lease non-current liabilities Other liabilities 415 407 The components of lease expense for the second quarter and six months ended October 4, 2020 and September 29, 2019 were as follows: Quarter ended Six months ended Classification October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Operating Leases: Operating lease cost Operating expenses $ 6,745 $ 7,260 $ 13,681 $ 14,555 Variable lease cost Operating expenses 1,613 2,122 3,732 3,828 Short term lease cost Operating expenses 1,578 1,927 3,406 4,111 Finance Leases: Depreciation Operating expenses $ 46 $ 138 $ 88 $ 281 Interest expense Interest expense 7 10 14 22 Total $ 9,989 $ 11,457 $ 20,921 $ 22,797 The following table presents the weighted average lease term and discount rates for leases as of October 4, 2020: Operating Leases: Weighted average remaining lease term 6 years Weighted average discount rate 5.35% Finance Leases: Weighted average remaining lease term 3.3 years Weighted average discount rate 4.95% The following table presents future payments due under leases reconciled to lease liabilities as of October 4, 2020: Finance Leases Operating Leases Six months ended March 31, 2021 $ 109 $ 12,839 Year ended March 31, 2022 217 21,638 2023 174 14,669 2024 120 9,190 2025 25 5,828 Thereafter 14 16,654 Total undiscounted lease payments 659 80,818 Present value discount 51 11,520 Lease liability $ 608 $ 69,298 The following table presents supplemental disclosures of cash flow information related to leases for the second quarter and six months ended October 4, 2020 and September 29, 2019: Quarter ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Operating cash flows from finance leases $ 7 $ 10 $ 14 $ 22 Operating cash flows from operating leases 6,739 7,170 13,660 14,383 Financing cash flows from finance leases 45 138 86 281 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 $ 87 $ — $ 87 $ — Right-of-use assets obtained in exchange for new operating lease liabilities 955 2,318 7,132 4,946

Acquisitions

Acquisitions	6 Months Ended
	Oct. 04, 2020
Business Combinations [Abstract]
Acquisitions	Acquisition NorthStar In fiscal 2020, the Company completed the acquisition of N Holding, AB (“NorthStar”) for $77,777 in cash consideration and the assumption of $107,018 in debt, which was funded using existing cash and credit facilities. NorthStar, through its direct and indirect subsidiaries, manufactures and distributes thin plate pure lead (TPPL) batteries and battery enclosures. NorthStar has two large manufacturing facilities in Springfield, Missouri. The Company acquired tangible and intangible assets, including trademarks, technology, customer relationships and goodwill. Based on valuations performed, trademarks were valued at $6,000, technology at $19,000, customer relationships at $9,000, and goodwill was recorded at $76,784. As a result of the change in operating and reportable segments discussed in Note 17, goodwill associated with the acquisition of NorthStar has been allocated to the Energy Systems and Specialty segments on a relative fair value basis. The useful lives of technology were estimated at 10 years, customer relationships were estimated at 15 to 18 years and trademarks were estimated at 5 years. Goodwill deductible for tax purposes is $75,436. During the second quarter of fiscal 2021, the Company finalized the measurement of all provisional amounts recognized in connection with the NorthStar business combination. The purchase accounting adjustments resulted in an increase to goodwill during the current quarter, by $2,996 as a result of finalizing income tax accounting. Other Intangible Assets Information regarding the Company’s other intangible assets are as follows: Balance as of October 4, 2020 March 31, 2020 Gross Amount Accumulated Amortization Net Amount Gross Amount Accumulated Amortization Net Amount Indefinite-lived intangible assets: Trademarks $ 148,000 $ (957) $ 147,043 $ 147,356 $ (953) $ 146,403 Finite-lived intangible assets: Customer relationships 295,840 (76,274) 219,566 292,155 (64,855) 227,300 Non-compete 3,029 (2,824) 205 3,021 (2,817) 204 Technology 96,765 (25,027) 71,738 96,047 (20,349) 75,698 Trademarks 8,008 (2,562) 5,446 8,008 (1,928) 6,080 Licenses 1,196 (1,196) — 1,196 (1,196) — Total $ 552,838 $ (108,840) $ 443,998 $ 547,783 $ (92,098) $ 455,685 The Company’s amortization expense related to finite-lived intangible assets was $8,187 and $16,742 for the second quarter and six months of fiscal 2021, compared to $7,309 and $14,625 for the second quarter and six months of fiscal 2020. The expected amortization expense based on the finite-lived intangible assets as of October 4, 2020, is $15,917 for the remainder of fiscal 2021, $32,420 in fiscal 2022, $31,122 in fiscal 2023, $27,725 in fiscal 2024 and $26,494 in fiscal 2025.

Inventories

Inventories	6 Months Ended
	Oct. 04, 2020
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories, net consist of: October 4, 2020 March 31, 2020 Raw materials $ 144,627 $ 141,906 Work-in-process 98,580 91,520 Finished goods 273,382 286,034 Total $ 516,589 $ 519,460

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Oct. 04, 2020
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments Recurring Fair Value Measurements The following tables represent the financial assets and (liabilities) measured at fair value on a recurring basis as of October 4, 2020 and March 31, 2020, and the basis for that measurement: Total Fair Value Measurement Quoted Price in Significant Significant Lead forward contracts $ (3,229) $ — $ (3,229) $ — Foreign currency forward contracts (213) — (213) — Total derivatives $ (3,442) $ — $ (3,442) $ — Total Fair Value Quoted Price in Significant Significant Lead forward contracts $ (2,433) $ — $ (2,433) $ — Foreign currency forward contracts 1 — 1 — Total derivatives $ (2,432) $ — $ (2,432) $ — 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 2020 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. In fiscal 2020, the Company issued its 4.375% Senior Notes due 2027 (the “2027 Notes”), with an original face value of $300,000. The Company's 5.00% Senior Notes due 2023 (the “2023 Notes”), with an original face value of $300,000, were issued in April 2015. The fair value of the 2027 Notes and 2023 Notes, (collectively, the “Senior Notes”) represent the trading values based upon quoted market prices and are classified as Level 2. The 2027 Notes were trading at approximately 102% and 94% of face value on October 4, 2020 and March 31, 2020, respectively. The 2023 Notes were trading at approximately 103% and 97% of face value on October 4, 2020 and March 31, 2020, respectively. The carrying amounts and estimated fair values of the Company’s derivatives and Senior Notes at October 4, 2020 and March 31, 2020 were as follows: October 4, 2020 March 31, 2020 Carrying Fair Value Carrying Fair Value Financial assets: Derivatives (1) $ — $ — $ — $ — Financial liabilities: Senior Notes (2) $ 600,000 $ 614,625 $ 600,000 $ 573,000 Derivatives (1) 3,442 3,442 2,432 2,432 (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 October 4, 2020 and March 31, 2020). (2) The fair value amount of the Senior Notes at October 4, 2020 and March 31, 2020 represent the trading value of the instruments.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Oct. 04, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company utilizes derivative instruments to reduce its exposure to fluctuations in commodity prices and foreign exchange rates under established procedures and controls. The Company does not enter into derivative contracts for speculative purposes. The Company’s agreements are with creditworthy financial institutions and the Company anticipates performance by counterparties to these contracts and therefore no material loss is expected. Derivatives in Cash Flow Hedging Relationships Lead Forward Contracts The Company enters into lead forward contracts to fix the price for a portion of its lead purchases. Management considers the lead forward contracts to be effective against changes in the cash flows of the underlying lead purchases. The vast majority of such contracts are for a period not extending beyond one year. At October 4, 2020 and March 31, 2020, the Company has hedged the price to purchase approximately 50.0 million pounds and 35.0 million pounds of lead, respectively, for a total purchase price of $43,228 and $30,078, 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 October 4, 2020 and March 31, 2020, the Company had entered into a total of $23,726 and $34,008, respectively, of such contracts. In the coming twelve months, the Company anticipates that $2,640 of pretax loss relating to lead and foreign currency forward contracts will be reclassified from AOCI (“Accumulated Other Comprehensive Income”) 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 October 4, 2020 and March 31, 2020, the notional amount of these contracts was $26,769 and $42,232, 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 October 4, 2020 and March 31, 2020 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments October 4, 2020 March 31, 2020 October 4, 2020 March 31, 2020 Prepaid and other current assets: Foreign currency forward contracts $ — $ — $ — $ 375 Total assets $ — $ — $ — $ 375 Accrued expenses: Lead forward contracts $ 3,229 $ 2,433 $ — $ — Foreign currency forward contracts 114 374 99 — Total liabilities $ 3,343 $ 2,807 $ 99 $ — The Effect of Derivative Instruments on the Consolidated Condensed Statements of Income For the quarter ended October 4, 2020 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 $ (2,219) Cost of goods sold $ (4,854) Foreign currency forward contracts (454) Cost of goods sold 257 Total $ (2,673) $ (4,597) 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 $ 260 Total $ 260 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 $ 1,526 Cost of goods sold $ (3,173) Foreign currency forward contracts 62 Cost of goods sold 63 Total $ 1,588 $ (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 six months ended October 4, 2020 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 $ (3,493) Cost of goods sold $ (8,653) Foreign currency forward contracts (193) Cost of goods sold (26) Total $ (3,686) $ (8,679) 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 $ 372 Total $ 372 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 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 $ (968) Cost of goods sold $ (2,732) Foreign currency forward contracts 165 Cost of goods sold 280 Total $ (803) $ (2,452) 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 $ (696) Total $ (696)

Income Taxes

Income Taxes	6 Months Ended
	Oct. 04, 2020
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 2021 and 2020 was based on the estimated effective tax rates applicable for the full years ending March 31, 2021 and March 31, 2020, 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 earnings 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 Company recorded a deferred tax asset of $22,500 during fiscal 2020 related to the amortizable goodwill. Based on further evaluation with the Swiss tax authority, the Company recorded an additional income tax benefit of $1,883 during the six months of fiscal 2021. The consolidated effective income tax rates for the second quarter of fiscal 2021 and 2020 were 13.9% and (29.5)% and for the six months of fiscal 2021 and 2020 were 14.6% and (4.0)%, respectively. The rate increase in the second quarter and six months of fiscal 2021 compared to the comparable prior year quarter 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 73% for fiscal 2021 compared to 75% for fiscal 2020. The foreign effective tax rates for the six months of fiscal 2021 and 2020 were 10.6% and (2.4)%, respectively. The rate increase compared to the prior year period is primarily due to Swiss tax reform and changes in the mix of earnings among tax

Warranty

Warranty	6 Months Ended
	Oct. 04, 2020
Product Warranties Disclosures [Abstract]
Warranty	Warranty The Company provides for estimated product warranty expenses when 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 October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Balance at beginning of period $ 59,771 $ 56,179 $ 63,525 $ 54,568 Current period provisions 7,683 6,475 14,657 13,994 Costs incurred (8,662) (7,227) (19,972) (13,175) Foreign currency translation adjustment 1,520 (491) 2,102 (451) Balance at end of period $ 60,312 $ 54,936 $ 60,312 $ 54,936

Commitments, Contingencies and

Commitments, Contingencies and Litigation	6 Months Ended
	Oct. 04, 2020
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. For additional information regarding these matters, see Note 19 - Commitments, Contingencies and Litigation to the consolidated financial statements contained in the Annual Report on Form 10-K for the fiscal year ended March 31, 2020. 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. With respect to the Belgian regulatory matter, during fiscal 2019, the Company paid $2,402 towards certain aspects related to this matter, which are under appeal. As of October 4, 2020 and March 31, 2020, the Company did not have a reserve balance related to these matters. 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 as of October 4, 2020 and March 31, 2020. Based on current information, the Company’s management believes this reserve is adequate to satisfy the Company’s environmental liabilities at this facility. This facility is separate from the Company’s current metal fabrication facility in Sumter. Lead and Foreign Currency Forward Contracts

Restructuring Plans

Restructuring Plans	6 Months Ended
	Oct. 04, 2020
Restructuring and Related Activities [Abstract]
Restructuring Plans	Restructuring and other Exit Charges Restructuring Plans As disclosed in the Company's Annual Report on Form 10-K for the fiscal year ended March 31, 2020, the Company committed to restructuring plans aimed at improving operational efficiencies across its lines of business. A substantial portion of these plans are complete with an estimated $5,500 remaining to be incurred by the end of fiscal 2021. Restructuring and exit charges for the second quarter and six months of fiscal 2021 by reportable segments are as follows: Quarter ended October 4, 2020 Energy Systems Motive Power Specialty Total Restructuring charges $ 1,331 $ 172 $ — $ 1,503 Exit charges — 1,509 107 1,616 Restructuring and other exit charges $ 1,331 $ 1,681 $ 107 $ 3,119 Six months ended October 4, 2020 Energy Systems Motive Power Specialty Total Restructuring charges $ 1,843 $ 934 $ 129 $ 2,906 Exit charges — 1,509 91 1,600 Restructuring and other exit charges $ 1,843 $ 2,443 $ 220 $ 4,506 A roll-forward of the restructuring reserve is as follows: Balance as of March 31, 2020 $ 3,325 Accrued 2,906 Costs incurred (4,068) Foreign currency impact 293 Balance as of October 4, 2020 $ 2,456 Exit Charges During fiscal 2021, the Company committed to a plan to close its facility in Vijayawada, India to align with its strategic vision for the new line of business structure and footprint. The Company recorded exit charges of $1,509, primarily relating to asset write-offs. 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 and an additional $5,123 relating to cash and non-cash charges during fiscal 2020. During the six months of fiscal 2021, in keeping with its strategy of exiting the manufacture of batteries for diesel-electric submarines, the Company continued to execute further actions which resulted in a non-material net impact from the cash and non-cash charges. During the second quarter of fiscal 2020, in keeping with its strategy of exiting the manufacture of batteries for diesel-electric submarines, the Company also sold certain licenses and assets for $2,031 and recorded a net gain of $892, which were reported as other exit charges in our Specialty segment. During the second quarter of fiscal 2020, the Company also wrote off $5,441 of assets at its Kentucky and Tennessee Motive Power plants, as a result of its strategic product mix shift from traditional flooded batteries to maintenance free lead acid and lithium batteries. Richmond, Kentucky Plant Fire In fiscal 2020, 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 are finishing cleanup and repair. The Company is nearing completion of the reconstruction of the facility and estimates that the total claim, including the replacement of inventory and equipment, the cleanup and repairs to the building, as well as the claim for business interruption is approximately $45,000. In fiscal 2020, the Company recorded $17,037 of write-offs for damages caused to its fixed assets and inventories, as well as for cleanup, asset replacement and other ancillary activities directly associated with the fire and received $12,000 in advances related to its initial claims for recovery from its property and casualty insurance carriers. During the six months of fiscal 2021, the Company recorded a further charge of $15,316 for cleanup and received $18,144 in advances from the insurance carriers. Accumulated charges relating to the fire through October 4, 2020 were $32,353 and advances received from the property and casualty insurance carriers were $30,144. The Company also received $10,156 through October 4, 2020, of which $5,156 was recorded in the six months of fiscal 2021 and $5,000 in fiscal 2020, relating to a partial settlement of its claim for business interruption which was recorded as a reduction to cost of goods sold. The Company expects to receive $2,000 in its third quarter of fiscal 2021 which would complete the settlement of its business interruption claim.

Debt

Debt	6 Months Ended
	Oct. 04, 2020
Debt Disclosure [Abstract]
Debt	Debt The following summarizes the Company’s long-term debt as of October 4, 2020 and March 31, 2020: October 4, 2020 March 31, 2020 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs Senior Notes $ 600,000 $ 5,706 $ 600,000 $ 6,306 Amended Credit Facility, due 2022 446,665 1,751 513,224 2,187 $ 1,046,665 $ 7,457 $ 1,113,224 $ 8,493 Less: Unamortized issuance costs 7,457 8,493 Long-term debt, net of unamortized issuance costs $ 1,039,208 $ 1,104,731 The Company's Senior Notes comprise the following: 4.375% Senior Notes due 2027 On December 11, 2019, the Company issued $300,000 in aggregate principal amount of its 4.375% Senior Notes due December 15, 2027 (the “2027 Notes”). Proceeds from this offering, net of debt issuance costs were $296,250 and were utilized to pay down the Amended 2017 Revolver (defined below). The 2027 Notes bear interest at a rate of 4.375% per annum accruing from December 11, 2019. Interest is payable semiannually in arrears on June 15 and December 15 of each year, commencing on June 15, 2020. The 2027 Notes mature on December 15, 2027, unless earlier redeemed or repurchased in full. The 2027 Notes are unsecured and unsubordinated obligations of the Company. The 2027 Notes are fully and unconditionally guaranteed, jointly and severally, by certain of its subsidiaries that are guarantors under the Amended Credit Facility. These guarantees are unsecured and unsubordinated obligations of such guarantors. The Company may redeem, prior to September 15, 2027, all or a portion of the 2027 Notes at a price equal to 100% of the principal amount of the 2027 Notes to be redeemed, plus accrued and unpaid interest and a “make whole” premium to, but excluding, the redemption date. The Company may redeem, on or after September 15, 2027, all or a portion of the 2027 Notes at a price equal to 100% of the principal amount of the 2027 Notes, plus accrued and unpaid interest to, but excluding, the redemption date. If a change of control triggering event occurs, the Company will be required to offer to repurchase the 2027 Notes at a price in cash equal to 101% of the aggregate principal amount of the 2027 Notes, plus accrued and unpaid interest to, but excluding, the date of repurchase. The 2027 Notes rank pari passu with the 2023 Notes. 5.00% Senior Notes due 2023 The 5% Senior Notes due April 30, 2023 (the “2023 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 2023 Notes will mature on April 30, 2023, unless earlier redeemed or repurchased in full. The 2023 Notes are unsecured and unsubordinated obligations of the Company. The 2023 Notes are fully and unconditionally guaranteed, jointly and severally, by certain of its subsidiaries that are guarantors under the Amended Credit Facility. These guarantees are unsecured and unsubordinated obligations of such 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, initially 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 October 4, 2020, the Company had $53,000 outstanding under the Amended 2017 Revolver and $393,665 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 28, 2019, the maximum leverage ratio was increased to 4.00x. On December 29, 2019, the maximum leverage ratio returned to 3.50x. The current portion of the Amended 2017 Term Loan of $44,990 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 October 4, 2020 and March 31, 2020, the Company had $31,813 and $46,544, respectively, of short-term borrowings. The weighted average interest rate on these borrowings was approximately 2% at October 4, 2020 and 3% at March 31, 2020. Letters of Credit As of October 4, 2020 and March 31, 2020, the Company had standby letters of credit of $7,720. Debt Issuance Costs Amortization expense, relating to debt issuance costs, included in interest expense was $518 and $374, respectively, for the quarters ended October 4, 2020 and September 29, 2019 and $1,036 and $752 for the six months ended October 4, 2020 and September 29, 2019. Debt issuance costs, net of accumulated amortization, totaled $7,457 and $8,493, respectively, at October 4, 2020 and March 31, 2020. Available Lines of Credit As of October 4, 2020 and March 31, 2020, the Company had available and undrawn, under all its lines of credit, $765,768 and $693,640, respectively, including $123,074 and $105,946, respectively, of uncommitted lines of credit as of October 4, 2020 and March 31, 2020.

Retirement Plans

Retirement Plans	6 Months Ended
	Oct. 04, 2020
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The following tables present the components of the Company’s net periodic benefit cost related to its defined benefit pension plans: United States Plans International Plans Quarter ended Quarter ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Service cost $ — $ — $ 252 $ 227 Interest cost 133 154 348 364 Expected return on plan assets (66) (114) (474) (518) Amortization and deferral 132 51 259 245 Net periodic benefit cost $ 199 $ 91 $ 385 $ 318 United States Plans International Plans Six months ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Service cost $ — $ — $ 487 $ 462 Interest cost 265 308 675 740 Expected return on plan assets (131) (226) (921) (1,056) Amortization and deferral 265 103 503 498 Net periodic benefit cost $ 399 $ 185 $ 744 $ 644

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Oct. 04, 2020
Share-based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation As of October 4, 2020, 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 $5,533 for the second quarter of fiscal 2021 and $4,994 for the second quarter of fiscal 2020. Stock-based compensation was $10,586 and $8,868 for the six months of fiscal 2021 and fiscal 2020, respectively. The Company recognizes compensation expense using the straight-line method over the vesting period of the awards. During fiscal 2021, the Company granted to non-employee directors 38,171 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. During fiscal 2021, the Company granted to management and other key employees 295,068 non-qualified stock options that vest ratably over three years from the date of grant and 283,101 restricted stock units that vest ratably over four years from the date of grant. Common stock activity during fiscal 2021 included the vesting of 199,499 restricted stock units, 65,096 TSRs and the exercise of 34,369 stock options.

Stockholders' Equity and Noncon

Stockholders' Equity and Noncontrolling Interests	6 Months Ended
	Oct. 04, 2020
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 October 4, 2020: Shares outstanding as of March 31, 2020 42,323,305 Shares issued under equity-based compensation plans, net of equity awards surrendered for option price and taxes 251,888 Shares outstanding as of October 4, 2020 42,575,193 Treasury Stock During the six months ended October 4, 2020, the Company did not purchase any shares but purchased 581,140 shares for $34,561 during the six months ended September 29, 2019. At October 4, 2020 and March 31, 2020, the Company held 12,786,633 and 12,791,503 shares as treasury stock, respectively. During the six months ended October 4, 2020, the Company also issued 6,667 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 October 4, 2020 and March 31, 2020, are as follows: March 31, 2020 Before Reclassifications Amounts Reclassified from AOCI October 4, 2020 Pension funded status adjustment $ (22,794) $ — $ 596 $ (22,198) Net unrealized (loss) gain on derivative instruments (5,923) (2,812) 6,625 (2,110) Foreign currency translation adjustment (186,289) 60,828 — (125,461) Accumulated other comprehensive (loss) income $ (215,006) $ 58,016 $ 7,221 $ (149,769) The following table presents reclassifications from AOCI during the second quarter ended October 4, 2020: Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in cash flow hedging relationships: Net unrealized loss on derivative instruments $ 4,597 Cost of goods sold Tax benefit (1,088) Net unrealized loss on derivative instruments, net of tax $ 3,509 Defined benefit pension costs: Prior service costs and deferrals $ 391 Net periodic benefit cost, included in other (income) expense, net - See Note 13 Tax benefit (86) Net periodic benefit cost, net of tax $ 305 The following table presents reclassifications from AOCI during the six months ended October 4, 2020: 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 $ 8,679 Cost of goods sold Tax benefit (2,054) Net unrealized loss on derivative instruments, net of tax $ 6,625 Defined benefit pension costs: Prior service costs and deferrals $ 768 Net periodic benefit cost, included in other (income) expense, net - See Note 13 Tax benefit (172) Net periodic benefit cost, net of tax $ 596 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 loss on derivative instruments $ 3,110 Cost of goods sold Tax benefit (736) Net unrealized loss 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 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 loss on derivative instruments $ 2,452 Cost of goods sold Tax benefit (580) Net unrealized loss 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 demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the second quarter and six months ended October 4, 2020: (In Thousands , Except Per Share Data) Common Additional Paid-in Treasury Retained Accumulated Contra-Equity Total Non- Total Balance at March 31, 2020 $ — $ 551 $ 529,100 $ (564,376) $ 1,556,980 $ (215,006) $ (6,724) $ 1,300,525 $ 3,537 $ 1,304,062 Stock-based compensation — — 5,053 — — — — 5,053 — 5,053 Exercise of stock options — 2 479 — — — — 481 — 481 Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net — — (3,135) — — — — (3,135) — (3,135) Other — — (123) 299 — — — 176 — 176 Net earnings — — — — 35,183 — — 35,183 — 35,183 Dividends ($0.175 per common share) — — 172 — (7,600) — — (7,428) — (7,428) Other comprehensive income: Pension funded status adjustment (net of tax benefit of $86) — — — — — 291 — 291 — 291 Net unrealized gain (loss) on derivative instruments (net of tax expense of $726) — — — — — 2,343 — 2,343 — 2,343 Foreign currency translation adjustment — — — — — 28,139 — 28,139 8 28,147 Balance at July 5, 2020 $ — $ 553 $ 531,546 $ (564,077) $ 1,584,563 $ (184,233) $ (6,724) $ 1,361,628 $ 3,545 $ 1,365,173 Stock-based compensation — — 5,533 — — — — 5,533 — 5,533 Exercise of stock options — 1 1,284 — — — — 1,285 — 1,285 Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net — — (1,467) — — — — (1,467) — (1,467) Contra equity - adjustment to indemnification receivable for acquisition related tax liability — — — — — — 1,451 1,451 — 1,451 Other — — (7) 224 — — — 217 — 217 Net earnings — — — — 35,731 — — 35,731 — 35,731 Dividends ($0.175 per common share) — — 203 — (7,654) — — (7,451) — (7,451) Other comprehensive income: Pension funded status adjustment (net of tax benefit of $86) — — — — — 305 — 305 — 305 Net unrealized gain (loss) on derivative instruments (net of tax expense of $454) — — — — — 1,470 — 1,470 — 1,470 Foreign currency translation adjustment — — — — — 32,689 — 32,689 144 32,833 Balance at October 4, 2020 $ — $ 554 $ 537,092 $ (563,853) $ 1,612,640 $ (149,769) $ (5,273) $ 1,431,391 $ 3,689 $ 1,435,080 The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the second quarter and six months ended September 29, 2019: (In Thousands , Except Per Share Data) Common Additional Paid-in Treasury Retained Accumulated Contra-Equity Total Non- Total Balance at March 31, 2019 $ — $ 548 $ 512,696 $ (530,760) $ 1,450,325 $ (142,682) $ (7,840) $ 1,282,287 $ 3,730 $ 1,286,017 Stock-based compensation — — 3,874 — — — — 3,874 — 3,874 Exercise of stock options — 3 35 — — — — 38 — 38 Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net — — (6,081) — — — — (6,081) — (6,081) Purchase of common stock — — — (23,029) — — — (23,029) — (23,029) Other — — (80) — — — — (80) — (80) Net earnings — — — — 48,636 — — 48,636 — 48,636 Dividends ($0.175 per common share) — — 133 — (7,632) — — (7,499) — (7,499) Other comprehensive income: Pension funded status adjustment (net of tax benefit of $68) — — — — — 237 — 237 — 237 Net unrealized gain (loss) on derivative instruments (net of tax benefit of $720) — — — — — (2,329) — (2,329) — (2,329) Foreign currency translation adjustment — — — — — (3,128) — (3,128) (83) (3,211) Balance at June 30, 2019 $ — $ 551 $ 510,577 $ (553,789) $ 1,491,329 $ (147,902) $ (7,840) $ 1,292,926 $ 3,647 $ 1,296,573 Stock-based compensation — — 4,994 — — — — 4,994 — 4,994 Exercise of stock options — — (13) — — — — (13) — (13) Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net — — (169) — — — — (169) — (169) Purchase of common stock — — — (11,532) — — — (11,532) — (11,532) Contra equity - adjustment to indemnification receivable for acquisition related tax liability — — — — — — 2,002 2,002 — 2,002 Other — — — 213 — — — 213 — 213 Net earnings — — — — 62,698 — — 62,698 — 62,698 Dividends ($0.175 per common share) — — 209 — (7,608) — — (7,399) — (7,399) Other comprehensive income: Pension funded status adjustment (net of tax benefit of $59) — — — — — 237 — 237 — 237 Net unrealized gain (loss) on derivative instruments (net of tax benefit of $1,112) — — — — — 3,586 — 3,586 — 3,586 Foreign currency translation adjustment — — — — — (32,068) — (32,068) (131) (32,199) Balance at September 29, 2019 $ — $ 551 $ 515,598 $ (565,108) $ 1,546,419 $ (176,147) $ (5,838) $ 1,315,475 $ 3,516 $ 1,318,991

Earnings Per Share

Earnings Per Share	6 Months Ended
	Oct. 04, 2020
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the reconciliation from basic to diluted weighted-average number of common shares outstanding and the calculations of net earnings per common share attributable to EnerSys stockholders. Quarter ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Net earnings attributable to EnerSys stockholders $ 35,731 $ 62,698 $ 70,914 $ 111,334 Weighted-average number of common shares outstanding: Basic 42,521,659 42,392,039 42,453,774 42,524,189 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 565,796 316,043 555,981 389,069 Diluted weighted-average number of common shares outstanding 43,087,455 42,708,082 43,009,755 42,913,258 Basic earnings per common share attributable to EnerSys stockholders $ 0.84 $ 1.48 $ 1.67 $ 2.62 Diluted earnings per common share attributable to EnerSys stockholders $ 0.83 $ 1.47 $ 1.65 $ 2.59 Anti-dilutive equity awards not included in diluted weighted-average common shares 149,616 1,005,326 267,940 831,068

Business Segments

Business Segments	6 Months Ended
	Oct. 04, 2020
Segment Reporting [Abstract]
Business Segments	Business Segments Effective April 1, 2020, the Company's chief operating decision maker, or CODM (the Company's Chief Executive Officer), changed the manner in which he reviews financial information for purposes of assessing business performance and allocating resources, by focusing on the lines of business on a global basis, rather than on geographic basis. As a result of this change, the Company re-evaluated the identification of its operating segments and reportable segments and identified the following as its three new operating segments, based on lines of business: • Energy Systems - uninterruptible power systems, or “UPS” applications for computer and computer-controlled systems, as well as telecommunications systems, switchgear and electrical control systems used in industrial facilities and electric utilities, large-scale energy storage and energy pipelines. Energy Systems also includes highly integrated power solutions and services to broadband, telecom, renewable and industrial customers, as well as thermally managed cabinets and enclosures for electronic equipment and batteries. • Motive Power - power for electric industrial forklifts used in manufacturing, warehousing and other material handling applications, as well as mining equipment, diesel locomotive starting and other rail equipment; and • Specialty - premium starting, lighting and ignition applications in transportation, energy solutions for satellites, military aircraft, submarines, ships and other tactical vehicles, as well as medical and security systems. The new operating segments also represent the Company's reportable segments under ASC 280, Segment Reporting . All prior comparative periods presented have been recast to conform to these changes. Summarized financial information related to the Company's reportable segments for the second quarter and six months ended October 4, 2020 and September 29, 2019, is shown below: Quarter ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Net sales by segment to unaffiliated customers Energy Systems $ 340,822 $ 342,925 $ 694,209 $ 696,818 Motive Power 263,738 335,315 526,572 679,702 Specialty 103,842 83,897 192,545 165,847 Total net sales $ 708,402 $ 762,137 $ 1,413,326 $ 1,542,367 Operating earnings by segment Energy Systems $ 22,997 $ 20,457 $ 45,082 $ 44,044 Motive Power 24,149 34,531 51,425 71,629 Specialty 11,388 10,004 16,634 20,027 Restructuring charges - Energy Systems (1,331) (622) (1,843) (1,732) Restructuring and other exit charges - Motive Power (1,681) (434) (2,443) (992) Restructuring and other exit charges - Specialty (107) 215 (220) (489) Fixed asset write-off relating to exit activities and other - Energy Systems — (50) — (50) Fixed asset write-off relating to exit activities and other - Motive Power — (5,380) — (5,380) Fixed asset write-off relating to exit activities - Specialty — (11) — (11) Total operating earnings (1) $ 55,415 $ 58,710 $ 108,635 $ 127,046 (1) The Company does not allocate interest expense or other (income) expense to the reportable segments. (2) The Company does not identify or allocate assets by reportable segment, nor does the CODM evaluate reportable segments using discrete asset information. (3) Reportable segments do not record inter-segment revenues and accordingly there are none to report. Goodwill Concurrent with the change in reporting segments effective April 1, 2020, goodwill was reassigned to the affected reporting units that have been identified within each operating segment, using a relative fair value approach outlined in ASC 350, Intangibles - Goodwill and Other . The following table presents the amount of goodwill that has been reassigned to each of the Company's reportable segments as of April 1, 2020, using the relative fair value approach, as well as any changes in the carrying amount of goodwill by segment during the six months of fiscal 2021: Energy Systems Motive Power Specialty Total Balance at March 31, 2020 $ 263,150 $ 308,497 $ 92,289 $ 663,936 Measurement period adjustments 1,348 — 1,648 2,996 Foreign currency translation adjustment 8,334 11,076 2,706 22,116 Balance as of October 4, 2020 $ 272,832 $ 319,573 $ 96,643 $ 689,048

Subsequent Events

Subsequent Events	6 Months Ended
	Oct. 04, 2020
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On November 10, 2020, the EnerSys’ Board of Directors approved a plan to substantially close its facility in Hagen, Germany, which produces flooded motive power batteries for forklifts. EnerSys expects to incur a pre-tax charge of approximately $82,000 under this plan when completed, the majority of which is expected to be recorded by the end of fiscal 2021, of which $20,000 is expected to be a non-cash charge from inventory and equipment write-offs. Cash charges include severance, clean up and decommissioning related to the facility, contractual releases and legal expenses. Management determined that future demand for the motive power batteries produced at this facility was not sufficient, given the conversion from flooded to maintenance free batteries by customers, the existing number of competitors in the market as well as the near term decline in demand and increased uncertainty from the ongoing pandemic. In connection with this restructuring plan, which is estimated to be substantially complete in fiscal 2022, EnerSys estimates that there will be a reduction of approximately 200 employees.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Oct. 04, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated condensed financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments except those otherwise described herein) considered necessary for a fair presentation have been included, unless otherwise disclosed. Operating results for the three and six months ended October 4, 2020 are not necessarily indicative of the results that may be expected for the fiscal year ending March 31, 2021. The Consolidated Condensed Balance Sheet at March 31, 2020 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 2020 Annual Report on Form 10-K (SEC File No. 001-32253), which was filed on June 1, 2020 (the “2020 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 2021 end on July 5, 2020, October 4, 2020, January 3, 2021, and March 31, 2021, respectively. The four quarters in fiscal 2020 ended on June 30, 2019, September 29, 2019, December 29, 2019, and March 31, 2020, 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 and Accounting Pronouncements Issued But Not Yet Adopted	Recently Adopted Accounting Pronouncements 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 adopted the standard effective April 1, 2020 and the adoption did not have a material impact on the Company's operating results, financial position or cash flows. However, the adoption resulted in the modification of the Company's policies for accounts receivable. The Company estimates the allowance for credit losses in relation to accounts receivable based on relevant qualitative and quantitative information about historical events, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported accounts receivable. Subsequent to April 1, 2020, accounts receivable are recorded at amortized cost less an allowance for expected credit losses. The Company maintains an allowance for credit losses for the expected failure or inability of its customers to make required payments. The Company recognizes the allowance for expected credit losses at inception and reassesses quarterly, based on management’s expectation of the asset’s collectability. The allowance is based on multiple factors including historical experience with bad debts, the credit quality of the customer base, the aging of such receivables and current macroeconomic conditions, as well as management’s expectations of conditions in the future. The Company’s allowance for uncollectible accounts receivable is based on management’s assessment of the collectability of assets pooled together with similar risk characteristics. The Company then adjusts the historical credit loss percentage by current and forecasted economic conditions. The Company then includes a baseline credit loss percentage into the historical credit loss percentage for each aging category to reflect the potential impact of the current and economic conditions. Such a baseline calculation will be adjusted further if changes in the economic environment impacts the Company's expectation for future credit losses. The following table sets forth the quarterly changes in the Company's allowance for doubtful accounts: Allowance for doubtful accounts: Balance at Beginning of Period Provision Write-offs, net of recoveries and other Balance at First quarter ended July 5, 2020 $ 15,246 $ 96 $ (2,113) $ 13,229 Second quarter ended October 4, 2020 $ 13,229 $ 86 $ 2 $ 13,317 In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848)”: Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides temporary optional expedients to ease the financial reporting burdens of the expected market transition from London Interbank Offered Rate (LIBOR) to an alternative reference rate such as Secured Overnight Financing Rate (SOFR). The Company’s agreements with respect to its borrowings already contain comparable alternative reference rates that would automatically take effect upon the phasing out of LIBOR. The Company has adopted the standard and the adoption did not have a material impact on the Company's consolidated financial statements. Accounting Pronouncements Issued But Not Adopted as of October 4, 2020 In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740)”: Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. The Company is currently assessing the potential impact that the adoption will have on its consolidated financial statements. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make estimates and assumptions that affect the amounts reported in the financial statements and accompanying notes. These estimates and assumptions take into account historical and forward looking factors that the Company believes are reasonable, including, but not limited to, the potential impacts arising from the coronavirus pandemic of 2019 (“COVID-19”) and public and private sector policies and initiatives aimed at reducing its transmission. As the extent and duration of the impacts of COVID-19 remain unclear, the Company’s estimates and assumptions may evolve as conditions change. Actual results could differ significantly from those estimates. Examples of significant estimates include the allowance for credit losses, the recoverability of property, plant and equipment, the incremental borrowing rate for lease liabilities, the recoverability of intangible assets and other long-lived assets, fair value measurements, including those related to financial instruments, goodwill and intangible assets, valuation allowances on tax assets, pension and postretirement benefit obligations, contingencies and the identification and valuation of assets acquired and liabilities assumed in connection with business combinations.

Basis of Presentation (Tables)

Basis of Presentation (Tables) - USD ($) $ in Thousands	3 Months Ended
	Oct. 04, 2020	Jul. 05, 2020	Mar. 31, 2020
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss	$ 13,317	$ 13,229	$ 15,246
Provision for doubtful debts	86	96
Financing Receivable, Allowance for Credit Loss, Recovery	$ 2	$ 2,113

Leases (Tables)

Leases (Tables)	6 Months Ended
	Oct. 04, 2020
Leases [Abstract]
Lessee, Supplemental Balance Sheet Information Related To Leases	The following table presents lease assets and liabilities and their balance sheet classification: Classification As of As of Operating Leases: Right-of-use assets Other assets $ 67,072 $ 70,045 Operating lease current liabilities Accrued expenses 21,511 21,128 Operating lease non-current liabilities Other liabilities 47,787 51,215 Finance Leases: Right-of-use assets Property, plant, and equipment, net $ 574 $ 540 Finance lease current liabilities Accrued expenses 193 162 Finance lease non-current liabilities Other liabilities 415 407
Lease, Cost	The components of lease expense for the second quarter and six months ended October 4, 2020 and September 29, 2019 were as follows: Quarter ended Six months ended Classification October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Operating Leases: Operating lease cost Operating expenses $ 6,745 $ 7,260 $ 13,681 $ 14,555 Variable lease cost Operating expenses 1,613 2,122 3,732 3,828 Short term lease cost Operating expenses 1,578 1,927 3,406 4,111 Finance Leases: Depreciation Operating expenses $ 46 $ 138 $ 88 $ 281 Interest expense Interest expense 7 10 14 22 Total $ 9,989 $ 11,457 $ 20,921 $ 22,797
Lessee, Supplemental Information Related To Leases	The following table presents the weighted average lease term and discount rates for leases as of October 4, 2020: Operating Leases: Weighted average remaining lease term 6 years Weighted average discount rate 5.35% Finance Leases: Weighted average remaining lease term 3.3 years Weighted average discount rate 4.95%
Lessee, Operating Lease, Liability, Maturity	The following table presents future payments due under leases reconciled to lease liabilities as of October 4, 2020: Finance Leases Operating Leases Six months ended March 31, 2021 $ 109 $ 12,839 Year ended March 31, 2022 217 21,638 2023 174 14,669 2024 120 9,190 2025 25 5,828 Thereafter 14 16,654 Total undiscounted lease payments 659 80,818 Present value discount 51 11,520 Lease liability $ 608 $ 69,298
Finance Lease, Liability, Maturity	The following table presents future payments due under leases reconciled to lease liabilities as of October 4, 2020: Finance Leases Operating Leases Six months ended March 31, 2021 $ 109 $ 12,839 Year ended March 31, 2022 217 21,638 2023 174 14,669 2024 120 9,190 2025 25 5,828 Thereafter 14 16,654 Total undiscounted lease payments 659 80,818 Present value discount 51 11,520 Lease liability $ 608 $ 69,298
Lessee, Supplemental Cash Flow Information Related To Leases	The following table presents supplemental disclosures of cash flow information related to leases for the second quarter and six months ended October 4, 2020 and September 29, 2019: Quarter ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Operating cash flows from finance leases $ 7 $ 10 $ 14 $ 22 Operating cash flows from operating leases 6,739 7,170 13,660 14,383 Financing cash flows from finance leases 45 138 86 281 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 $ 87 $ — $ 87 $ — Right-of-use assets obtained in exchange for new operating lease liabilities 955 2,318 7,132 4,946

Acquisition (Tables)

Acquisition (Tables)	6 Months Ended
	Oct. 04, 2020
Business Combinations [Abstract]
Schedule of Intangible Assets	Information regarding the Company’s other intangible assets are as follows: Balance as of October 4, 2020 March 31, 2020 Gross Amount Accumulated Amortization Net Amount Gross Amount Accumulated Amortization Net Amount Indefinite-lived intangible assets: Trademarks $ 148,000 $ (957) $ 147,043 $ 147,356 $ (953) $ 146,403 Finite-lived intangible assets: Customer relationships 295,840 (76,274) 219,566 292,155 (64,855) 227,300 Non-compete 3,029 (2,824) 205 3,021 (2,817) 204 Technology 96,765 (25,027) 71,738 96,047 (20,349) 75,698 Trademarks 8,008 (2,562) 5,446 8,008 (1,928) 6,080 Licenses 1,196 (1,196) — 1,196 (1,196) — Total $ 552,838 $ (108,840) $ 443,998 $ 547,783 $ (92,098) $ 455,685

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Oct. 04, 2020
Inventory Disclosure [Abstract]
Summary Of Inventories	Inventories, net consist of: October 4, 2020 March 31, 2020 Raw materials $ 144,627 $ 141,906 Work-in-process 98,580 91,520 Finished goods 273,382 286,034 Total $ 516,589 $ 519,460

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Oct. 04, 2020
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 October 4, 2020 and March 31, 2020, and the basis for that measurement: Total Fair Value Measurement Quoted Price in Significant Significant Lead forward contracts $ (3,229) $ — $ (3,229) $ — Foreign currency forward contracts (213) — (213) — Total derivatives $ (3,442) $ — $ (3,442) $ — Total Fair Value Quoted Price in Significant Significant Lead forward contracts $ (2,433) $ — $ (2,433) $ — Foreign currency forward contracts 1 — 1 — Total derivatives $ (2,432) $ — $ (2,432) $ —
Carrying Amounts And Estimated Fair Values Of Company's Financial Instruments	The carrying amounts and estimated fair values of the Company’s derivatives and Senior Notes at October 4, 2020 and March 31, 2020 were as follows: October 4, 2020 March 31, 2020 Carrying Fair Value Carrying Fair Value Financial assets: Derivatives (1) $ — $ — $ — $ — Financial liabilities: Senior Notes (2) $ 600,000 $ 614,625 $ 600,000 $ 573,000 Derivatives (1) 3,442 3,442 2,432 2,432 (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 October 4, 2020 and March 31, 2020). (2) The fair value amount of the Senior Notes at October 4, 2020 and March 31, 2020 represent the trading value of the instruments.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	6 Months Ended
	Oct. 04, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivative Instruments	Presented below in tabular form is information on the location and amounts of derivative fair values in the Consolidated Condensed Balance Sheets and derivative gains and losses in the Consolidated Condensed Statements of Income: Fair Value of Derivative Instruments October 4, 2020 and March 31, 2020 Derivatives and Hedging Activities Designated as Cash Flow Hedges Derivatives and Hedging Activities Not Designated as Hedging Instruments October 4, 2020 March 31, 2020 October 4, 2020 March 31, 2020 Prepaid and other current assets: Foreign currency forward contracts $ — $ — $ — $ 375 Total assets $ — $ — $ — $ 375 Accrued expenses: Lead forward contracts $ 3,229 $ 2,433 $ — $ — Foreign currency forward contracts 114 374 99 — Total liabilities $ 3,343 $ 2,807 $ 99 $ —
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 October 4, 2020 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 $ (2,219) Cost of goods sold $ (4,854) Foreign currency forward contracts (454) Cost of goods sold 257 Total $ (2,673) $ (4,597) 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 $ 260 Total $ 260 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 $ 1,526 Cost of goods sold $ (3,173) Foreign currency forward contracts 62 Cost of goods sold 63 Total $ 1,588 $ (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 six months ended October 4, 2020 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 $ (3,493) Cost of goods sold $ (8,653) Foreign currency forward contracts (193) Cost of goods sold (26) Total $ (3,686) $ (8,679) 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 $ 372 Total $ 372 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 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 $ (968) Cost of goods sold $ (2,732) Foreign currency forward contracts 165 Cost of goods sold 280 Total $ (803) $ (2,452) 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 $ (696) Total $ (696)

Warranty (Tables)

Warranty (Tables)	6 Months Ended
	Oct. 04, 2020
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 October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Balance at beginning of period $ 59,771 $ 56,179 $ 63,525 $ 54,568 Current period provisions 7,683 6,475 14,657 13,994 Costs incurred (8,662) (7,227) (19,972) (13,175) Foreign currency translation adjustment 1,520 (491) 2,102 (451) Balance at end of period $ 60,312 $ 54,936 $ 60,312 $ 54,936

Restructuring Plans (Tables)

Restructuring Plans (Tables)	6 Months Ended
	Oct. 04, 2020
Restructuring and Related Activities [Abstract]
Reconciliation of Restructuring Reserve	Restructuring and exit charges for the second quarter and six months of fiscal 2021 by reportable segments are as follows: Quarter ended October 4, 2020 Energy Systems Motive Power Specialty Total Restructuring charges $ 1,331 $ 172 $ — $ 1,503 Exit charges — 1,509 107 1,616 Restructuring and other exit charges $ 1,331 $ 1,681 $ 107 $ 3,119 Six months ended October 4, 2020 Energy Systems Motive Power Specialty Total Restructuring charges $ 1,843 $ 934 $ 129 $ 2,906 Exit charges — 1,509 91 1,600 Restructuring and other exit charges $ 1,843 $ 2,443 $ 220 $ 4,506 A roll-forward of the restructuring reserve is as follows: Balance as of March 31, 2020 $ 3,325 Accrued 2,906 Costs incurred (4,068) Foreign currency impact 293 Balance as of October 4, 2020 $ 2,456

Debt (Tables)

Debt (Tables)	6 Months Ended
	Oct. 04, 2020
Debt Disclosure [Abstract]
Long-Term Debt And Capital Lease Obligations	The following summarizes the Company’s long-term debt as of October 4, 2020 and March 31, 2020: October 4, 2020 March 31, 2020 Principal Unamortized Issuance Costs Principal Unamortized Issuance Costs Senior Notes $ 600,000 $ 5,706 $ 600,000 $ 6,306 Amended Credit Facility, due 2022 446,665 1,751 513,224 2,187 $ 1,046,665 $ 7,457 $ 1,113,224 $ 8,493 Less: Unamortized issuance costs 7,457 8,493 Long-term debt, net of unamortized issuance costs $ 1,039,208 $ 1,104,731

Retirement Plans (Tables)

Retirement Plans (Tables)	6 Months Ended
	Oct. 04, 2020
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 October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Service cost $ — $ — $ 252 $ 227 Interest cost 133 154 348 364 Expected return on plan assets (66) (114) (474) (518) Amortization and deferral 132 51 259 245 Net periodic benefit cost $ 199 $ 91 $ 385 $ 318 United States Plans International Plans Six months ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Service cost $ — $ — $ 487 $ 462 Interest cost 265 308 675 740 Expected return on plan assets (131) (226) (921) (1,056) Amortization and deferral 265 103 503 498 Net periodic benefit cost $ 399 $ 185 $ 744 $ 644

Stockholders' Equity and Nonc_2

Stockholders' Equity and Noncontrolling Interests (Tables)	6 Months Ended
	Oct. 04, 2020
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 October 4, 2020: Shares outstanding as of March 31, 2020 42,323,305 Shares issued under equity-based compensation plans, net of equity awards surrendered for option price and taxes 251,888 Shares outstanding as of October 4, 2020 42,575,193
Components Of Accumulated Other Comprehensive Income	The components of AOCI, net of tax, as of October 4, 2020 and March 31, 2020, are as follows: March 31, 2020 Before Reclassifications Amounts Reclassified from AOCI October 4, 2020 Pension funded status adjustment $ (22,794) $ — $ 596 $ (22,198) Net unrealized (loss) gain on derivative instruments (5,923) (2,812) 6,625 (2,110) Foreign currency translation adjustment (186,289) 60,828 — (125,461) Accumulated other comprehensive (loss) income $ (215,006) $ 58,016 $ 7,221 $ (149,769)
Reclassification from Accumulated Other Comprehensive Income	The following table presents reclassifications from AOCI during the second quarter ended October 4, 2020: Components of AOCI Amounts Reclassified from AOCI Location of (Gain) Loss Recognized on Income Statement Derivatives in cash flow hedging relationships: Net unrealized loss on derivative instruments $ 4,597 Cost of goods sold Tax benefit (1,088) Net unrealized loss on derivative instruments, net of tax $ 3,509 Defined benefit pension costs: Prior service costs and deferrals $ 391 Net periodic benefit cost, included in other (income) expense, net - See Note 13 Tax benefit (86) Net periodic benefit cost, net of tax $ 305 The following table presents reclassifications from AOCI during the six months ended October 4, 2020: 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 $ 8,679 Cost of goods sold Tax benefit (2,054) Net unrealized loss on derivative instruments, net of tax $ 6,625 Defined benefit pension costs: Prior service costs and deferrals $ 768 Net periodic benefit cost, included in other (income) expense, net - See Note 13 Tax benefit (172) Net periodic benefit cost, net of tax $ 596 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 loss on derivative instruments $ 3,110 Cost of goods sold Tax benefit (736) Net unrealized loss 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 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 loss on derivative instruments $ 2,452 Cost of goods sold Tax benefit (580) Net unrealized loss 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
Schedule of Change in Stockholders Equity	The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the second quarter and six months ended October 4, 2020: (In Thousands , Except Per Share Data) Common Additional Paid-in Treasury Retained Accumulated Contra-Equity Total Non- Total Balance at March 31, 2020 $ — $ 551 $ 529,100 $ (564,376) $ 1,556,980 $ (215,006) $ (6,724) $ 1,300,525 $ 3,537 $ 1,304,062 Stock-based compensation — — 5,053 — — — — 5,053 — 5,053 Exercise of stock options — 2 479 — — — — 481 — 481 Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net — — (3,135) — — — — (3,135) — (3,135) Other — — (123) 299 — — — 176 — 176 Net earnings — — — — 35,183 — — 35,183 — 35,183 Dividends ($0.175 per common share) — — 172 — (7,600) — — (7,428) — (7,428) Other comprehensive income: Pension funded status adjustment (net of tax benefit of $86) — — — — — 291 — 291 — 291 Net unrealized gain (loss) on derivative instruments (net of tax expense of $726) — — — — — 2,343 — 2,343 — 2,343 Foreign currency translation adjustment — — — — — 28,139 — 28,139 8 28,147 Balance at July 5, 2020 $ — $ 553 $ 531,546 $ (564,077) $ 1,584,563 $ (184,233) $ (6,724) $ 1,361,628 $ 3,545 $ 1,365,173 Stock-based compensation — — 5,533 — — — — 5,533 — 5,533 Exercise of stock options — 1 1,284 — — — — 1,285 — 1,285 Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net — — (1,467) — — — — (1,467) — (1,467) Contra equity - adjustment to indemnification receivable for acquisition related tax liability — — — — — — 1,451 1,451 — 1,451 Other — — (7) 224 — — — 217 — 217 Net earnings — — — — 35,731 — — 35,731 — 35,731 Dividends ($0.175 per common share) — — 203 — (7,654) — — (7,451) — (7,451) Other comprehensive income: Pension funded status adjustment (net of tax benefit of $86) — — — — — 305 — 305 — 305 Net unrealized gain (loss) on derivative instruments (net of tax expense of $454) — — — — — 1,470 — 1,470 — 1,470 Foreign currency translation adjustment — — — — — 32,689 — 32,689 144 32,833 Balance at October 4, 2020 $ — $ 554 $ 537,092 $ (563,853) $ 1,612,640 $ (149,769) $ (5,273) $ 1,431,391 $ 3,689 $ 1,435,080 The following demonstrates the change in equity attributable to EnerSys stockholders and nonredeemable noncontrolling interests during the second quarter and six months ended September 29, 2019: (In Thousands , Except Per Share Data) Common Additional Paid-in Treasury Retained Accumulated Contra-Equity Total Non- Total Balance at March 31, 2019 $ — $ 548 $ 512,696 $ (530,760) $ 1,450,325 $ (142,682) $ (7,840) $ 1,282,287 $ 3,730 $ 1,286,017 Stock-based compensation — — 3,874 — — — — 3,874 — 3,874 Exercise of stock options — 3 35 — — — — 38 — 38 Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net — — (6,081) — — — — (6,081) — (6,081) Purchase of common stock — — — (23,029) — — — (23,029) — (23,029) Other — — (80) — — — — (80) — (80) Net earnings — — — — 48,636 — — 48,636 — 48,636 Dividends ($0.175 per common share) — — 133 — (7,632) — — (7,499) — (7,499) Other comprehensive income: Pension funded status adjustment (net of tax benefit of $68) — — — — — 237 — 237 — 237 Net unrealized gain (loss) on derivative instruments (net of tax benefit of $720) — — — — — (2,329) — (2,329) — (2,329) Foreign currency translation adjustment — — — — — (3,128) — (3,128) (83) (3,211) Balance at June 30, 2019 $ — $ 551 $ 510,577 $ (553,789) $ 1,491,329 $ (147,902) $ (7,840) $ 1,292,926 $ 3,647 $ 1,296,573 Stock-based compensation — — 4,994 — — — — 4,994 — 4,994 Exercise of stock options — — (13) — — — — (13) — (13) Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net — — (169) — — — — (169) — (169) Purchase of common stock — — — (11,532) — — — (11,532) — (11,532) Contra equity - adjustment to indemnification receivable for acquisition related tax liability — — — — — — 2,002 2,002 — 2,002 Other — — — 213 — — — 213 — 213 Net earnings — — — — 62,698 — — 62,698 — 62,698 Dividends ($0.175 per common share) — — 209 — (7,608) — — (7,399) — (7,399) Other comprehensive income: Pension funded status adjustment (net of tax benefit of $59) — — — — — 237 — 237 — 237 Net unrealized gain (loss) on derivative instruments (net of tax benefit of $1,112) — — — — — 3,586 — 3,586 — 3,586 Foreign currency translation adjustment — — — — — (32,068) — (32,068) (131) (32,199) Balance at September 29, 2019 $ — $ 551 $ 515,598 $ (565,108) $ 1,546,419 $ (176,147) $ (5,838) $ 1,315,475 $ 3,516 $ 1,318,991

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Oct. 04, 2020
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	The following table sets forth the reconciliation from basic to diluted weighted-average number of common shares outstanding and the calculations of net earnings per common share attributable to EnerSys stockholders. Quarter ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Net earnings attributable to EnerSys stockholders $ 35,731 $ 62,698 $ 70,914 $ 111,334 Weighted-average number of common shares outstanding: Basic 42,521,659 42,392,039 42,453,774 42,524,189 Dilutive effect of: Common shares from exercise and lapse of equity awards, net of shares assumed reacquired 565,796 316,043 555,981 389,069 Diluted weighted-average number of common shares outstanding 43,087,455 42,708,082 43,009,755 42,913,258 Basic earnings per common share attributable to EnerSys stockholders $ 0.84 $ 1.48 $ 1.67 $ 2.62 Diluted earnings per common share attributable to EnerSys stockholders $ 0.83 $ 1.47 $ 1.65 $ 2.59 Anti-dilutive equity awards not included in diluted weighted-average common shares 149,616 1,005,326 267,940 831,068

Business Segments Business Segm

Business Segments Business Segments (Tables)	6 Months Ended
	Oct. 04, 2020
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 October 4, 2020 and September 29, 2019, is shown below: Quarter ended Six months ended October 4, 2020 September 29, 2019 October 4, 2020 September 29, 2019 Net sales by segment to unaffiliated customers Energy Systems $ 340,822 $ 342,925 $ 694,209 $ 696,818 Motive Power 263,738 335,315 526,572 679,702 Specialty 103,842 83,897 192,545 165,847 Total net sales $ 708,402 $ 762,137 $ 1,413,326 $ 1,542,367 Operating earnings by segment Energy Systems $ 22,997 $ 20,457 $ 45,082 $ 44,044 Motive Power 24,149 34,531 51,425 71,629 Specialty 11,388 10,004 16,634 20,027 Restructuring charges - Energy Systems (1,331) (622) (1,843) (1,732) Restructuring and other exit charges - Motive Power (1,681) (434) (2,443) (992) Restructuring and other exit charges - Specialty (107) 215 (220) (489) Fixed asset write-off relating to exit activities and other - Energy Systems — (50) — (50) Fixed asset write-off relating to exit activities and other - Motive Power — (5,380) — (5,380) Fixed asset write-off relating to exit activities - Specialty — (11) — (11) Total operating earnings (1) $ 55,415 $ 58,710 $ 108,635 $ 127,046 (1) The Company does not allocate interest expense or other (income) expense to the reportable segments. (2) The Company does not identify or allocate assets by reportable segment, nor does the CODM evaluate reportable segments using discrete asset information. (3) Energy Systems Motive Power Specialty Total Balance at March 31, 2020 $ 263,150 $ 308,497 $ 92,289 $ 663,936 Measurement period adjustments 1,348 — 1,648 2,996 Foreign currency translation adjustment 8,334 11,076 2,706 22,116 Balance as of October 4, 2020 $ 272,832 $ 319,573 $ 96,643 $ 689,048

Basis of Presentation - Allowan

Basis of Presentation - Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 04, 2020	Jul. 05, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 13,229	$ 15,246
Provision for doubtful debts	86	96
Write-offs, net of recoveries and other	(2)	(2,113)
Balance at End of Period	$ 13,317	$ 13,229

Revenue Recognition - (Addition

Revenue Recognition - (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 708,402	$ 762,137	$ 1,413,326	$ 1,542,367
Remaining performance obligation	104,552		104,552
Contract with customer, liability, current portion	17,871		17,871		$ 17,342
Contract with customer, liability, noncurrent portion	6,383		6,383		8,356
Deferred Revenue, Revenue Recognized	4,175	3,690	7,641	8,157
Unbilled contracts receivable	49,769		49,769		$ 39,048
Right to recover product	4,267		4,267
Refund liability	7,034		7,034
Transferred over Time
Disaggregation of Revenue [Line Items]
Net sales	35,074	33,595	71,176	75,090
Service
Disaggregation of Revenue [Line Items]
Net sales	$ 74,327	$ 61,282	$ 143,085	$ 122,000

Revenue Recognition - (Remainin

Revenue Recognition - (Remaining Performance Obligation) (Details) $ in Thousands	Oct. 04, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 104,552
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	$ 53,781
Remaining performance obligation, timing of satisfaction	6 months
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	$ 36,990
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	$ 12,388
Remaining performance obligation, timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 1,359
Remaining performance obligation, timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 34
Remaining performance obligation, timing of satisfaction	1 year

Leases - (Additional Informatio

Leases - (Additional Information) (Details)	Oct. 04, 2020
Minimum
Lessee, Lease, Description [Line Items]
Contract term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Contract term	17 years

Leases - (Balance Sheet Classif

Leases - (Balance Sheet Classification) (Details) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Leases [Abstract]
Operating lease right-of-use asset	$ 67,072	$ 70,045
Operating lease current liabilities	21,511	21,128
Operating lease non-current liabilities	47,787	51,215
Finance lease right-of-use asset	574	540
Finance lease current liabilities	193	162
Finance lease non-current liabilities	$ 415	$ 407

Leases - (Lease Cost) (Details)

Leases - (Lease Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Operating Leases:
Operating lease cost	$ 6,745	$ 7,260	$ 13,681	$ 14,555
Variable lease cost	1,613	2,122	3,732	3,828
Short term lease cost	1,578	1,927	3,406	4,111
Finance Leases:
Depreciation	46	138	88	281
Interest expense	7	10	14	22
Total	$ 9,989	$ 11,457	$ 20,921	$ 22,797

Leases - (Additional Informat_2

Leases - (Additional Information Related to Leases) (Details)	Oct. 04, 2020
Operating Leases:
Weighted average remaining lease term	6 years
Weighted average discount rate	5.35%
Finance Leases:
Weighted average remaining lease term	3 years 3 months 18 days
Weighted average discount rate	4.95%

Leases - (Finance and Operating

Leases - (Finance and Operating Lease Maturity Schedules) (Details) $ in Thousands	Oct. 04, 2020USD ($)
Finance Leases
Six months ended March 31, 2021	$ 109
Year ended March 31, 2021	217
Year ended March 31, 2022	174
Year ended March 31, 2023	120
Year ended March 31, 2024	25
Thereafter	14
Total undiscounted lease payments	659
Present value discount	51
Lease liability	608
Operating Leases
Six months ended March 31, 2021	12,839
Year ended March 31, 2021	21,638
Year ended March 31, 2022	14,669
Year ended March 31, 2023	9,190
Year ended March 31, 2024	5,828
Thereafter	16,654
Total undiscounted lease payments	80,818
Present value discount	11,520
Lease liability	$ 69,298

Leases - (Supplemental Cash Flo

Leases - (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Operating cash flows from finance leases	$ 7	$ 10	$ 14	$ 22
Operating cash flows from operating leases	6,739	7,170	13,660	14,383
Financing cash flows from finance leases	45	138	86	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	87	0	87	0
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 955	$ 2,318	$ 7,132	$ 4,946

Acquisitions - (Additional Info

Acquisitions - (Additional Information) (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Oct. 04, 2020	Jul. 05, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019	Mar. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 689,048			$ 689,048		$ 663,936
Estimated tax-deductible goodwill						75,436
Purchase accounting adjustment related to goodwill				2,996
Amortization of intangible assets	8,187		$ 7,309	16,742	$ 14,625
Amortization of intangible assets, remainder of 2020	15,917			15,917
Amortization of intangible assets, 2021	32,420			32,420
Amortization of intangible assets, 2022	31,122			31,122
Amortization of intangible assets, 2023	27,725			27,725
Amortization of intangible assets, 2024	26,494			$ 26,494
N Holding AB
Business Acquisition [Line Items]
Payments to acquire businesses					77,777
Debt assumed						107,018
Goodwill						$ 76,784
Purchase accounting adjustment related to goodwill	$ 2,996
N Holding AB | Developed Technology Rights
Business Acquisition [Line Items]
Acquired intangible assets					$ 19,000
Useful life of intangible assets					10 years
N Holding AB | Trademarks
Business Acquisition [Line Items]
Acquired intangible assets					$ 6,000
Useful life of intangible assets					5 years
N Holding AB | Customer relationships
Business Acquisition [Line Items]
Acquired intangible assets					$ 9,000
Minimum | N Holding AB | Customer relationships
Business Acquisition [Line Items]
Useful life of intangible assets		15 years
Maximum | N Holding AB | Customer relationships
Business Acquisition [Line Items]
Useful life of intangible assets		18 years

Acquisitions - (Other Intangibl

Acquisitions - (Other Intangible Assets) (Details) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Total intangible assets, gross amount	$ 552,838	$ 547,783
Total intangible assets, accumulated amortization	(108,840)	(92,098)
Total intangible assets, net amount	443,998	455,685
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	295,840	292,155
Finite-lived intangible assets, accumulated amortization	(76,274)	(64,855)
Finite-lived intangible assets, net amount	219,566	227,300
Non-compete
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	3,029	3,021
Finite-lived intangible assets, accumulated amortization	(2,824)	(2,817)
Finite-lived intangible assets, net amount	205	204
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	96,765	96,047
Finite-lived intangible assets, accumulated amortization	(25,027)	(20,349)
Finite-lived intangible assets, net amount	71,738	75,698
Trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, gross amount	148,000	147,356
Indefinite-lived intangible assets, accumulated amortization	(957)	(953)
Indefinite-lived intangible assets, net amount	147,043	146,403
Finite-lived intangible assets, gross amount	8,008	8,008
Finite-lived intangible assets, accumulated amortization	(2,562)	(1,928)
Finite-lived intangible assets, net amount	5,446	6,080
Licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross amount	1,196	1,196
Finite-lived intangible assets, accumulated amortization	(1,196)	(1,196)
Finite-lived intangible assets, net amount	$ 0	$ 0

Inventories - (Details)

Inventories - (Details) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 144,627	$ 141,906
Work-in-process	98,580	91,520
Finished goods	273,382	286,034
Total	$ 516,589	$ 519,460

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - (Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ (3,442)	$ (2,432)
Quoted Price in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(3,442)	(2,432)
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	0	0
Lead forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(3,229)	(2,433)
Lead forward contracts | Quoted Price in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	0	0
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	(3,229)	(2,433)
Lead forward contracts | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	0	0
Foreign currency forward contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	(213)	1
Foreign currency forward contracts | Quoted Price in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	0	0
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	(213)	1
Foreign currency forward contracts | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative fair value	$ 0	$ 0

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - (Additional Information) (Details) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020	Dec. 11, 2019	Apr. 23, 2015
4.375% Senior Notes due 2027
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	4.375%		4.375%
Long-term debt	$ 300,000		$ 300,000
Face value of trades, percentage	102.00%	94.00%
5.00% Senior Notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate	5.00%			5.00%
Long-term debt	$ 300,000			$ 300,000
Face value of trades, percentage	103.00%	97.00%

Fair Value of Financial Instr_5

Fair Value of Financial Instruments - (Carrying Amounts and Estimated Fair Values) (Details) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	$ 0	$ 0
Notes	600,000	600,000
Derivative liability	3,442	2,432
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	0	0
Notes	614,625	573,000
Derivative liability	$ 3,442	$ 2,432

Derivative Financial Instrume_3

Derivative Financial Instruments - (Additional Information) (Details) $ in Thousands, lb in Millions	Oct. 04, 2020USD ($)lb	Mar. 31, 2020USD ($)lb
Cost of Sales
Derivatives, Fair Value [Line Items]
Foreign currency cash flow hedge loss to be reclassified during next 12 months	$ 2,640
Lead forward contracts
Derivatives, Fair Value [Line Items]
Notional amount in pounds | lb	50	35
Fair value of hedges, net	$ 43,228	$ 30,078
Foreign currency forward contracts
Derivatives, Fair Value [Line Items]
Derivative notional amount	23,726	34,008
Foreign currency forward contracts | Derivatives and Hedging Activities Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 26,769	$ 42,232

Derivative Financial Instrume_4

Derivative Financial Instruments - (Location and Amounts of Derivative Fair Values) (Details) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Derivatives and Hedging Activities Designated as Cash Flow Hedges
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	$ 0	$ 0
Derivatives liabilities, fair value	3,343	2,807
Derivatives and Hedging Activities Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	0	375
Derivatives liabilities, fair value	99	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	114	374
Foreign currency forward contracts | Derivatives and Hedging Activities Designated as Cash Flow Hedges | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivative 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	99	0
Foreign currency forward contracts | Derivatives and Hedging Activities Not Designated as Hedging Instruments | Prepaid and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets, fair value	0	375
Lead forward contracts | Derivatives and Hedging Activities Designated as Cash Flow Hedges | Accrued expenses
Derivatives, Fair Value [Line Items]
Derivatives liabilities, fair value	3,229	2,433
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 Instrume_5

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
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	$ (2,673)	$ 1,588	$ (3,686)	$ (803)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(4,597)	(3,110)	(8,679)	(2,452)
Lead forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(2,219)	1,526	(3,493)	(968)
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	(4,854)	(3,173)	(8,653)	(2,732)
Foreign currency forward contracts | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Pretax Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)	(454)	62	(193)	165
Pretax Gain (Loss) Reclassified from AOCI into Income (Effective Portion)	$ 257	$ 63	$ (26)	$ 280

Derivative Financial Instrume_6

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
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ 260	$ (730)	$ 372	$ (696)
Other Income Expense
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives Not Designated as Hedging Instruments	$ 260	$ (730)	$ 372	$ (696)

Income Taxes - (Additional Info

Income Taxes - (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019	Jul. 05, 2020
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Goodwill and Intangible Assets					$ 22,500
Additional tax benefit recognized			$ 1,883
Effective income tax rates	13.90%	(29.50%)	14600000.00%	(4000000.00%)
Foreign income as a percentage of worldwide income			73.00%	75.00%
Foreign effective income tax rates	10.60%	(2.40%)
Tax rate of Swiss subsidiary			8.00%	6.00%

Warranty - (Analysis of Changes

Warranty - (Analysis of Changes in the Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Product Warranties Disclosures [Abstract]
Balance at beginning of period	$ 59,771	$ 56,179	$ 63,525	$ 54,568
Current period provisions	7,683	6,475	14,657	13,994
Costs incurred	(8,662)	(7,227)	(19,972)	(13,175)
Foreign currency translation adjustment	1,520	(491)	2,102	(451)
Balance at end of period	$ 60,312	$ 54,936	$ 60,312	$ 54,936

Commitments, Contingencies an_2

Commitments, Contingencies and Litigation - (Additional Information) (Details) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended	12 Months Ended
	Feb. 29, 2016	Oct. 04, 2020	Mar. 31, 2020
Commitments, Contingencies And Litigation [Line Items]
Provision for environmental liabilities		$ 1,060	$ 1,060
Belgium Anti-Competition Proceeding
Commitments, Contingencies And Litigation [Line Items]
Penalties paid relating to anti-competition investigations	$ 1,962		$ 2,402

Restructuring Plans - (Addition

Restructuring Plans - (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		9 Months Ended	15 Months Ended
	Jan. 03, 2021	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019	Dec. 31, 2019	Jul. 05, 2020	Jun. 30, 2020	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Expected remaining cost		$ 5,500		$ 5,500
Restructuring and other exit charges		3,119	$ 6,282	4,506	$ 8,654
Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,503		2,906
Exit charges		1,616		1,600
Restructuring and other exit charges		3,119		4,506
Restructuring costs incurred				4,068
Energy Systems | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		1,331		1,843
Exit charges		0		0
Restructuring and other exit charges		1,331		1,843
Motive Power | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		172		934
Exit charges		1,509		1,509
Restructuring and other exit charges		1,681		2,443
Specialty | Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges		0		129
Exit charges		107		91
Restructuring and other exit charges		107		220
Closure Of Facility In Targovishte Bulgaria
Restructuring Cost and Reserve [Line Items]
Expected remaining cost									$ 30,000
Restructuring and other exit charges						$ 20,242
Richmond Kentucky Battery Formation Area Fire
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges		15,316			17,037			$ 32,353
Expected additional restructuring charges		45,000		45,000
Prepaid Insurance		18,144		$ 18,144					$ 12,000
Restructuring costs incurred		5,156			$ 5,000		$ 10,156	$ 30,144
Richmond Kentucky Battery Formation Area Fire | Subsequent Event
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred	$ 2,000
Strategy To Exit Manufacture Of Batteries For Diesel-Electric Submarines
Restructuring Cost and Reserve [Line Items]
Proceeds for sale of certain licenses and assets		2,031
Gain on sale of assets		892
Fixed Asset Write-Off, Kentucky And Tennessee Plants
Restructuring Cost and Reserve [Line Items]
Restructuring and other exit charges		$ 5,441

Restructuring Plans - (Roll-for

Restructuring Plans - (Roll-forward of Restructuring Reserve) (Details) - Employee Severance $ in Thousands	6 Months Ended
	Oct. 04, 2020USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, beginning balance	$ 3,325
Accrued	2,906
Costs incurred	(4,068)
Foreign currency impact	293
Restructuring reserve, ending balance	$ 2,456

Debt - (Long-term Debt Includin

Debt - (Long-term Debt Including Capital Lease Obligations) (Details) - USD ($) $ in Thousands	Oct. 04, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
Debt and capital lease obligations	$ 1,046,665	$ 1,113,224
Unamortized Issuance Costs	7,457	8,493
Long-term debt, net of unamortized issuance costs	1,039,208	1,104,731
Senior Notes
Debt Instrument [Line Items]
Long-term debt	600,000	600,000
Unamortized Issuance Costs	5,706	6,306
Secured Debt | Incremental Commitment Agreement | Amended Credit Facility, due 2022
Debt Instrument [Line Items]
Incremental term loan commitment	446,665	513,224
Unamortized Issuance Costs	$ 1,751	$ 2,187

Debt - (Additional Information)

Debt - (Additional Information) (Details)	Dec. 11, 2019USD ($)	Aug. 04, 2017USD ($)	Oct. 04, 2020USD ($)	Sep. 30, 2019USD ($)	Oct. 04, 2020USD ($)	Sep. 30, 2019USD ($)	Mar. 31, 2020USD ($)	Dec. 28, 2019	Mar. 31, 2019USD ($)	Mar. 31, 2019CAD ($)	Apr. 23, 2015USD ($)
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			$ 31,813,000		$ 31,813,000		$ 46,544,000
Short-term debt, weighted average interest rate			2.00%		2.00%		3.00%
Amortization expense relating to debt issuance costs and included in interest expense			$ 518,000	$ 374,000	$ 1,036,000	$ 752,000
Deferred issuance costs, net of accumulated amortization			7,457,000		7,457,000		$ 8,493,000
4.375% Senior Notes due 2027
Debt Instrument [Line Items]
Long-term debt	$ 300,000,000		$ 300,000,000		$ 300,000,000
Interest rate	4.375%		4.375%		4.375%
Proceeds from issuance of debt, net of debt issuance costs	$ 296,250,000
5.00% Senior Notes due 2023
Debt Instrument [Line Items]
Long-term debt			$ 300,000,000		$ 300,000,000						$ 300,000,000
Interest rate			5.00%		5.00%						5.00%
Standby Letters of Credit
Debt Instrument [Line Items]
Available lines of credit			$ 765,768,000		$ 765,768,000		693,640,000
Stand by letters of credit			7,720,000		7,720,000		7,720,000
Outstanding amount			123,074,000		123,074,000		$ 105,946,000
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			53,000,000		53,000,000
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			393,665,000		393,665,000
Current portion of long-term debt			$ 44,990,000		$ 44,990,000
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									449,105,000	$ 133,050,000
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%
CDOR | 2017 Revolver And 2017 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate		0.50%
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]
Measurement input			3.50		3.50			4
Maximum Leverage Ratio | Minimum
Debt Instrument [Line Items]
Measurement input			3.50		3.50
Maximum Leverage Ratio | Maximum
Debt Instrument [Line Items]
Measurement input			4		4
Prior to September 15, 2027 | 4.375% Senior Notes due 2027
Debt Instrument [Line Items]
Redemption percentage					100.00%
On or after September 15, 2027 | 4.375% Senior Notes due 2027
Debt Instrument [Line Items]
Redemption percentage					100.00%
Change of control triggering event | 4.375% Senior Notes due 2027
Debt Instrument [Line Items]
Redemption percentage					101.00%

Retirement Plans - (Net Periodi

Retirement Plans - (Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
United States Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	133	154	265	308
Expected return on plan assets	(66)	(114)	(131)	(226)
Amortization and deferral	132	51	265	103
Net periodic benefit cost	199	91	399	185
International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	252	227	487	462
Interest cost	348	364	675	740
Expected return on plan assets	(474)	(518)	(921)	(1,056)
Amortization and deferral	259	245	503	498
Net periodic benefit cost	$ 385	$ 318	$ 744	$ 644

Stock-Based Compensation - (Add

Stock-Based Compensation - (Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
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	$ 5,533	$ 4,994	$ 10,586	$ 8,868
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested restricted stock units (in shares)			199,499
Awards outstanding (in shares)	932,976		932,976
TSRs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	125,537		125,537
Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised (in shares)			34,369
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)	99,608		99,608
Non-employee Directors | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			38,171
Non-employee Directors | TSRs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)	65,096
Management and Other Key Employees | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock unit grants during period (in shares)			283,101
Management and Other Key Employees | Employee Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants during period (in shares)			295,068
Stock option grants outstanding (in shares)	1,025,768		1,025,768

Stockholders' Equity and Nonc_3

Stockholders' Equity and Noncontrolling Interests - (Change in the Number of Shares of Common Stock Outstanding) (Details) - shares	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020
Common Stock Outstanding Roll Forward
Shares outstanding, beginning balance (in shares)			42,323,305
Purchase of treasury stock (in shares)	0	581,140
Shares issued towards equity-based compensation plans, net of equity awards surrendered for option price and taxes (in shares)			251,888
Shares outstanding, ending balance (in shares)	42,575,193		42,575,193

Stockholders' Equity and Nonc_4

Stockholders' Equity and Noncontrolling Interests - (Treasury Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019	Mar. 31, 2020
Equity [Abstract]
Purchase of treasury stock (in shares)	0	581,140
Treasury stock purchased during period, value		$ 34,561	$ 0	$ 34,561
Treasury stock (in shares)	12,786,633		12,786,633		12,791,503
Treasury shares issued (in shares)			6,667
Treasury shares issued (in dollars per share)			$ 62.55

Stockholders' Equity and Nonc_5

Stockholders' Equity and Noncontrolling Interests - (Components of Accumulated Other Comprehensive Income) (Details) $ in Thousands	6 Months Ended
	Oct. 04, 2020USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	$ 1,304,062
Ending balance	1,435,080
Pension funded status adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	22,794
Before Reclassifications	0
Amounts Reclassified from AOCI	(596)
Ending balance	22,198
Net unrealized (loss) gain on derivative instruments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(5,923)
Before Reclassifications	2,812
Amounts Reclassified from AOCI	6,625
Ending balance	(2,110)
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(186,289)
Before Reclassifications	(60,828)
Amounts Reclassified from AOCI	0
Ending balance	(125,461)
Accumulated other comprehensive (loss) income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(215,006)
Before Reclassifications	58,016
Amounts Reclassified from AOCI	7,221
Ending balance	$ (149,769)

Stockholders' Equity and Nonc_6

Stockholders' Equity and Noncontrolling Interests - (Reclassifications from AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net unrealized loss on derivative instruments	$ (530,842)	$ (564,820)	$ (1,060,789)	$ (1,143,538)
Derivatives in cash flow hedging relationships
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense (benefit)	(1,088)	(736)	(2,054)	(580)
Net of tax	3,509	2,374	6,625	1,872
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 loss on derivative instruments	4,597	3,110	8,679	2,452
Defined benefit pension costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs and deferrals	391	296	768	601
Tax expense (benefit)	(86)	(59)	(172)	(127)
Net of tax	$ 305	$ 237	$ 596	$ 474

- (Other Disclosures) (Details)

- (Other Disclosures) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Oct. 04, 2020	Jul. 05, 2020	Sep. 30, 2019	Jun. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,365,173	$ 1,304,062	$ 1,296,573	$ 1,286,017	$ 1,304,062	$ 1,286,017
Stock-based compensation	5,533	5,053	4,994	3,874
Exercise of stock options	1,285	481	(13)	38
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(1,467)	(3,135)	(169)	(6,081)
Purchase of common stock			(11,532)	(23,029)
Other	217	176	213	(80)
Net earnings	35,731	35,183	62,698	48,636
Dividends	(7,451)	(7,428)	(7,399)	(7,499)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	(1,451)		(2,002)
Other comprehensive income:
Pension funded status adjustment, net of tax	305	291	237	237	596	474
Net unrealized gain (loss) on derivative instruments (net of tax)	1,470	2,343	3,586	(2,329)	3,813	1,257
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	32,833	28,147	(32,199)	(3,211)	60,980	(35,410)
Ending balance	$ 1,435,080	$ 1,365,173	$ 1,318,991	$ 1,296,573	$ 1,435,080	$ 1,318,991
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.35	$ 0.35
Pension funded status adjustment, tax benefit (expense)	$ 86	$ 86	$ 59	$ 68
Net unrealized gain (loss) on derivative instruments, tax (benefit) expense	(454)	726	1,112	720
Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	$ 0	$ 0
Other comprehensive income:
Ending balance	0	0	0	0	0	0
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	553	551	551	548	551	548
Exercise of stock options	1	2		3
Other comprehensive income:
Ending balance	554	553	551	551	554	551
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	531,546	529,100	510,577	512,696	529,100	512,696
Stock-based compensation	5,533	5,053	4,994	3,874
Exercise of stock options	1,284	479	(13)	35
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(1,467)	(3,135)	(169)	(6,081)
Other	(7)	(123)	0	(80)
Dividends	203	172	209	133
Other comprehensive income:
Ending balance	537,092	531,546	515,598	510,577	537,092	515,598
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(564,077)	(564,376)	(553,789)	(530,760)	(564,376)	(530,760)
Purchase of common stock			(11,532)	(23,029)
Other	224	299	213
Other comprehensive income:
Ending balance	(563,853)	(564,077)	(565,108)	(553,789)	(563,853)	(565,108)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,584,563	1,556,980	1,491,329	1,450,325	1,556,980	1,450,325
Net earnings	35,731	35,183	62,698	48,636
Dividends	(7,654)	(7,600)	(7,608)	(7,632)
Other comprehensive income:
Ending balance	1,612,640	1,584,563	1,546,419	1,491,329	1,612,640	1,546,419
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(184,233)	(215,006)	(147,902)	(142,682)	(215,006)	(142,682)
Other comprehensive income:
Pension funded status adjustment, net of tax	305	291	237	237
Net unrealized gain (loss) on derivative instruments (net of tax)	1,470	2,343	3,586	(2,329)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	32,689	28,139	(32,068)	(3,128)
Ending balance	(149,769)	(184,233)	(176,147)	(147,902)	(149,769)	(176,147)
Contra-Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(6,724)	(6,724)	(7,840)	(7,840)	(6,724)	(7,840)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	(1,451)		(2,002)
Other comprehensive income:
Ending balance	(5,273)	(6,724)	(5,838)	(7,840)	(5,273)	(5,838)
Total EnerSys Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,361,628	1,300,525	1,292,926	1,282,287	1,300,525	1,282,287
Stock-based compensation	5,533	5,053	4,994	3,874
Exercise of stock options	1,285	481	(13)	38
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(1,467)	(3,135)	(169)	(6,081)
Purchase of common stock			(11,532)	(23,029)
Other	217	176	213	(80)
Net earnings	35,731	35,183	62,698	48,636
Dividends	(7,451)	(7,428)	(7,399)	(7,499)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	(1,451)		(2,002)
Other comprehensive income:
Pension funded status adjustment, net of tax	305	291	237	237
Net unrealized gain (loss) on derivative instruments (net of tax)	1,470	2,343	3,586	(2,329)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	32,689	28,139	(32,068)	(3,128)
Ending balance	1,431,391	1,361,628	1,315,475	1,292,926	1,431,391	1,315,475
Non- redeemable Non- Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,545	3,537	3,647	3,730	3,537	3,730
Net earnings				0
Other comprehensive income:
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	144	8	(131)	(83)
Ending balance	$ 3,689	$ 3,545	$ 3,516	$ 3,647	$ 3,689	$ 3,516

Earnings Per Share - (Reconcili

Earnings Per Share - (Reconciliation from Basic to Diluted Average Common Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020	Sep. 30, 2019	Oct. 04, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders		$ 62,698	$ 70,914	$ 111,334
Basic weighted-average number of common shares outstanding (in shares)	42,521,659	42,392,039	42,453,774	42,524,189
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	565,796	316,043	555,981	389,069
Diluted weighted-average number of common shares outstanding (in shares)	43,087,455	42,708,082	43,009,755	42,913,258
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.84	$ 1.48	$ 1.67	$ 2.62
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.83	$ 1.47	$ 1.65	$ 2.59
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	149,616	1,005,326	267,940	831,068
Redeemable Noncontrolling Interest [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders	$ 35,731

Business Segments - (Details)

Business Segments - (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 04, 2020USD ($)	Sep. 30, 2019USD ($)	Oct. 04, 2020USD ($)segment	Sep. 30, 2019USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			3
Net sales	$ 708,402	$ 762,137	$ 1,413,326	$ 1,542,367
Operating earnings by segment	55,415	58,710	108,635	127,046
Restructuring charges	3,119	6,282	4,506	8,654
Energy Systems | Energy Systems
Segment Reporting Information [Line Items]
Net sales	340,822	342,925	694,209	696,818
Operating earnings by segment	22,997	20,457	45,082	44,044
Restructuring charges	1,331	622	1,843	1,732
Motive Power | Motive Power
Segment Reporting Information [Line Items]
Net sales	263,738	335,315	526,572	679,702
Operating earnings by segment	24,149	34,531	51,425	71,629
Restructuring charges	1,681	434	2,443	992
Specialty | Specialty
Segment Reporting Information [Line Items]
Net sales	103,842	83,897	192,545	165,847
Operating earnings by segment	11,388	10,004	16,634	20,027
Restructuring charges	107	(215)	220	489
Inventory Adjustment | Energy Systems
Segment Reporting Information [Line Items]
Restructuring charges	0	50	0	50
Fixed Asset Write-Off | Motive Power
Segment Reporting Information [Line Items]
Restructuring charges	0	5,380	0	5,380
Fixed Asset Write-Off | Specialty
Segment Reporting Information [Line Items]
Restructuring charges	$ 0	$ 11	$ 0	$ 11

Business Segments - (Goodwill)

Business Segments - (Goodwill) (Details) $ in Thousands	6 Months Ended
	Oct. 04, 2020USD ($)
Segment Reporting Information [Line Items]
Balance at March 31, 2020	$ 663,936
Measurement period adjustments	2,996
Foreign currency translation adjustment	22,116
Balance as of October 4, 2020	689,048
Energy Systems
Segment Reporting Information [Line Items]
Balance at March 31, 2020	263,150
Measurement period adjustments	1,348
Foreign currency translation adjustment	8,334
Balance as of October 4, 2020	272,832
Motive Power
Segment Reporting Information [Line Items]
Balance at March 31, 2020	308,497
Measurement period adjustments	0
Foreign currency translation adjustment	11,076
Balance as of October 4, 2020	319,573
Specialty
Segment Reporting Information [Line Items]
Balance at March 31, 2020	92,289
Measurement period adjustments	1,648
Foreign currency translation adjustment	2,706
Balance as of October 4, 2020	$ 96,643

Subsequent Events - (Details)

Subsequent Events - (Details) - Subsequent Event $ / shares in Units, $ in Thousands	Nov. 06, 2020Employee	Oct. 04, 2020$ / shares	Nov. 10, 2020USD ($)
Subsequent Event [Line Items]
Common stock dividends (in dollars per share) | $ / shares		$ 0.175
Hagen, Germany | Facility Closing
Subsequent Event [Line Items]
Expected additional restructuring charges			$ 82
Non Cash Charges | Hagen, Germany | Facility Closing
Subsequent Event [Line Items]
Expected additional restructuring charges			$ 20
Facility Closing | Hagen, Germany
Subsequent Event [Line Items]
Estimated number of positions eliminated | Employee	200