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- (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

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