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- (Other Disclosures) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jan. 03, 2021	Oct. 04, 2020	Jul. 05, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Jan. 03, 2021	Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,435,080	$ 1,365,173	$ 1,304,062	$ 1,318,991	$ 1,296,573	$ 1,286,017	$ 1,304,062	$ 1,286,017
Stock-based compensation	6,396	5,533	5,053	5,891	4,994	3,874
Exercise of stock options	3,052	1,285	481	480	(13)	38
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(357)	(1,467)	(3,135)	(31)	(169)	(6,081)
Purchase of common stock					(11,532)	(23,029)
Other	190	217	176	231	213	(80)
Net earnings	38,624	35,731	35,183	27,305	62,698	48,636
Dividends	(7,459)	(7,451)	(7,428)	(7,401)	(7,399)	(7,499)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability		1,451		(769)	2,002
Other comprehensive income:
Pension funded status adjustment, net of tax	269	305	291	220	237	237	865	694
Net unrealized gain (loss) on derivative instruments (net of tax)	2,718	1,470	2,343	(3,409)	3,586	(2,329)	6,531	(2,152)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	52,901	32,833	28,147	28,167	(32,199)	(3,211)	113,881	(7,243)
Ending balance	$ 1,531,414	$ 1,435,080	$ 1,365,173	$ 1,369,675	$ 1,318,991	$ 1,296,573	$ 1,531,414	$ 1,369,675
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.175	$ 0.525	$ 0.525
Pension funded status adjustment, tax benefit (expense)	$ 86	$ 86	$ 86	$ 71	$ 59	$ 68
Net unrealized gain (loss) on derivative instruments, tax (benefit) expense	(845)	(454)	726	1,055	1,112	720
Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	$ 0	$ 0
Other comprehensive income:
Ending balance	0	0	0	0	0	0	0	0
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	554	553	551	551	551	548	551	548
Exercise of stock options		1	2			3
Other comprehensive income:
Ending balance	554	554	553	551	551	551	554	551
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	537,092	531,546	529,100	515,598	510,577	512,696	529,100	512,696
Stock-based compensation	6,396	5,533	5,053	5,891	4,994	3,874
Exercise of stock options	3,052	1,284	479	480	(13)	35
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(357)	(1,467)	(3,135)	(31)	(169)	(6,081)
Other	(1)	(7)	(123)	0	0	(80)
Dividends	203	203	172	208	209	133
Other comprehensive income:
Ending balance	546,385	537,092	531,546	522,146	515,598	510,577	546,385	522,146
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(563,853)	(564,077)	(564,376)	(565,108)	(553,789)	(530,760)	(564,376)	(530,760)
Purchase of common stock					(11,532)	(23,029)
Other	191	224	299	231	213
Other comprehensive income:
Ending balance	(563,662)	(563,853)	(564,077)	(564,877)	(565,108)	(553,789)	(563,662)	(564,877)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,612,640	1,584,563	1,556,980	1,546,419	1,491,329	1,450,325	1,556,980	1,450,325
Net earnings	38,624	35,731	35,183	27,305	62,698	48,636
Dividends	(7,681)	(7,654)	(7,600)	(7,609)	(7,608)	(7,632)
Other comprehensive income:
Ending balance	1,643,583	1,612,640	1,584,563	1,566,115	1,546,419	1,491,329	1,643,583	1,566,115
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(149,769)	(184,233)	(215,006)	(176,147)	(147,902)	(142,682)	(215,006)	(142,682)
Other comprehensive income:
Pension funded status adjustment, net of tax	269	305	291	220	237	237
Net unrealized gain (loss) on derivative instruments (net of tax)	2,718	1,470	2,343	(3,409)	3,586	(2,329)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	52,752	32,689	28,139	28,103	(32,068)	(3,128)
Ending balance	(94,030)	(149,769)	(184,233)	(151,233)	(176,147)	(147,902)	(94,030)	(151,233)
Contra-Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(5,273)	(6,724)	(6,724)	(5,838)	(7,840)	(7,840)	(6,724)	(7,840)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability		1,451		(769)	2,002
Other comprehensive income:
Ending balance	(5,273)	(5,273)	(6,724)	(6,607)	(5,838)	(7,840)	(5,273)	(6,607)
Total EnerSys Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,431,391	1,361,628	1,300,525	1,315,475	1,292,926	1,282,287	1,300,525	1,282,287
Stock-based compensation	6,396	5,533	5,053	5,891	4,994	3,874
Exercise of stock options	3,052	1,285	481	480	(13)	38
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(357)	(1,467)	(3,135)	(31)	(169)	(6,081)
Purchase of common stock					(11,532)	(23,029)
Other	190	217	176	231	213	(80)
Net earnings	38,624	35,731	35,183	27,305	62,698	48,636
Dividends	(7,478)	(7,451)	(7,428)	(7,401)	(7,399)	(7,499)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability		1,451		(769)	2,002
Other comprehensive income:
Pension funded status adjustment, net of tax	269	305	291	220	237	237
Net unrealized gain (loss) on derivative instruments (net of tax)	2,718	1,470	2,343	(3,409)	3,586	(2,329)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	52,752	32,689	28,139	28,103	(32,068)	(3,128)
Ending balance	1,527,557	1,431,391	1,361,628	1,366,095	1,315,475	1,292,926	1,527,557	1,366,095
Non- redeemable Non- Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,689	3,545	3,537	3,516	3,647	3,730	3,537	3,730
Net earnings						0
Dividends	19
Other comprehensive income:
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	149	144	8	64	(131)	(83)
Ending balance	$ 3,857	$ 3,689	$ 3,545	$ 3,580	$ 3,516	$ 3,647	$ 3,857	$ 3,580

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