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Stockholders' Equity and Noncontrolling Interests - (Other Disclosures) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Oct. 03, 2021	Jul. 04, 2021	Oct. 04, 2020	Jul. 05, 2020	Oct. 03, 2021	Oct. 04, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,567,426	$ 1,543,576	$ 1,365,173	$ 1,304,062	$ 1,543,576	$ 1,304,062
Stock-based compensation	5,765	3,659	5,533	5,053
Exercise of stock options	771	387	1,285	481
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(4,197)	(4,803)	(1,467)	(3,135)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	1,354		1,451
Purchase of common stock	0	(31,512)	0	0
Other	226	214	217	176
Net earnings	35,626	43,929	35,731	35,183
Dividends	(7,456)	(7,435)	(7,451)	(7,428)
Dissolution of joint venture		(47)
Other comprehensive income:
Pension funded status adjustment, net of tax	233	240	305	291	473	596
Net unrealized gain (loss) on derivative instruments (net of tax)	(2,233)	3,897	1,470	2,343	1,664	3,813
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	(23,658)	15,321	32,833	28,147	(8,337)	60,980
Ending balance	$ 1,573,857	$ 1,567,426	$ 1,435,080	$ 1,365,173	$ 1,573,857	$ 1,435,080
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)	$ 69	$ 68	$ 86	$ 86
Net unrealized gain (loss) on derivative instrument, income tax expense (benefit)	683	1,187	454	726
Total EnerSys Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,563,603	1,539,755	1,361,628	1,300,525	$ 1,539,755	$ 1,300,525
Stock-based compensation	5,765	3,659	5,533	5,053
Exercise of stock options	771	387	1,285	481
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(4,197)	(4,803)	(1,467)	(3,135)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	1,354		1,451
Purchase of common stock	0	(31,512)	0	0
Other	226	214	217	176
Net earnings	35,626	43,929	35,731	35,183
Dividends	(7,456)	(7,435)	(7,451)	(7,428)
Other comprehensive income:
Pension funded status adjustment, net of tax	233	240	305	291
Net unrealized gain (loss) on derivative instruments (net of tax)	(2,233)	3,897	1,470	2,343
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	(23,673)	15,272	32,689	28,139
Ending balance	1,570,019	1,563,603	1,431,391	1,361,628	1,570,019	1,431,391
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	556	555	553	551	555	551
Exercise of stock options	1	1	1	2
Other comprehensive income:
Ending balance	557	556	554	553	557	554
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	553,627	554,168	531,546	529,100	554,168	529,100
Stock-based compensation	5,765	3,659	5,533	5,053
Exercise of stock options	770	386	1,284	479
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(4,197)	(4,803)	(1,467)	(3,135)
Other	52	44	(7)	(123)
Dividends	185	173	203	172
Other comprehensive income:
Ending balance	556,202	553,627	537,092	531,546	556,202	537,092
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(594,823)	(563,481)	(564,077)	(564,376)	(563,481)	(564,376)
Purchase of common stock	0	(31,512)	0	0
Other	174	170	224	299
Other comprehensive income:
Ending balance	(594,649)	(594,823)	(563,853)	(564,077)	(594,649)	(563,853)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,706,072	1,669,751	1,584,563	1,556,980	1,669,751	1,556,980
Net earnings	35,626	43,929	35,731	35,183
Dividends	(7,641)	(7,608)	(7,654)	(7,600)
Other comprehensive income:
Ending balance	1,734,057	1,706,072	1,612,640	1,584,563	1,734,057	1,612,640
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(96,474)	(115,883)	(184,233)	(215,006)	(115,883)	(215,006)
Other comprehensive income:
Pension funded status adjustment, net of tax	233	240	305	291
Net unrealized gain (loss) on derivative instruments (net of tax)	(2,233)	3,897	1,470	2,343
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	(23,673)	15,272	32,689	28,139
Ending balance	(122,147)	(96,474)	(149,769)	(184,233)	(122,147)	(149,769)
Contra-Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(5,355)	(5,355)	(6,724)	(6,724)	(5,355)	(6,724)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	1,354		1,451
Other comprehensive income:
Ending balance	(4,001)	(5,355)	(5,273)	(6,724)	(4,001)	(5,273)
Non- redeemable Non- Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,823	3,821	3,545	3,537	3,821	3,537
Dissolution of joint venture		(47)
Other comprehensive income:
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	15	49	144	8
Ending balance	$ 3,838	$ 3,823	$ 3,689	$ 3,545	$ 3,838	$ 3,689

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