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Stockholders' Equity and Noncontrolling Interests - (Other Disclosures) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Jan. 02, 2022	Oct. 03, 2021	Jul. 04, 2021	Jan. 03, 2021	Oct. 04, 2020	Jul. 05, 2020	Jan. 02, 2022	Jan. 03, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,573,857	$ 1,567,426	$ 1,543,576	$ 1,435,080	$ 1,365,173	$ 1,304,062	$ 1,543,576	$ 1,304,062
Stock-based compensation	6,393	5,765	3,659	6,396	5,533	5,053
Exercise of stock options	115	771	387	3,052	1,285	481
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(120)	(4,197)	(4,803)	(357)	(1,467)	(3,135)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	381	1,354			1,451
Purchase of common stock	(83,022)	0	(31,512)	0	0	0
Other	226	226	214	190	217	176
Net earnings	36,264	35,626	43,929	38,624	35,731	35,183
Dividends	(7,296)	(7,456)	(7,435)	(7,459)	(7,451)	(7,428)
Dissolution of joint venture			(47)
Other comprehensive income:
Pension funded status adjustment, net of tax	216	233	240	269	305	291	689	865
Net unrealized gain (loss) on derivative instruments (net of tax)	(786)	(2,233)	3,897	2,718	1,470	2,343	878	6,531
Foreign currency translation adjustment	(18,214)	(23,658)	15,321	52,901	32,833	28,147	(26,551)	113,881
Ending balance	$ 1,508,014	$ 1,573,857	$ 1,567,426	$ 1,531,414	$ 1,435,080	$ 1,365,173	$ 1,508,014	$ 1,531,414
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)	$ 69	$ 69	$ 68	$ 86	$ 86	$ 86
Net unrealized gain (loss) on derivative instrument, income tax expense (benefit)	241	683	1,187	845	454	726
Total EnerSys Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,570,019	1,563,603	1,539,755	1,431,391	1,361,628	1,300,525	$ 1,539,755	$ 1,300,525
Stock-based compensation	6,393	5,765	3,659	6,396	5,533	5,053
Exercise of stock options	115	771	387	3,052	1,285	481
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(120)	(4,197)	(4,803)	(357)	(1,467)	(3,135)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	381	1,354			1,451
Purchase of common stock	(83,022)	0	(31,512)	0	0	0
Other	226	226	214	190	217	176
Net earnings	36,264	35,626	43,929	38,624	35,731	35,183
Dividends	(7,296)	(7,456)	(7,435)	(7,478)	(7,451)	(7,428)
Other comprehensive income:
Pension funded status adjustment, net of tax	216	233	240	269	305	291
Net unrealized gain (loss) on derivative instruments (net of tax)	(786)	(2,233)	3,897	2,718	1,470	2,343
Foreign currency translation adjustment	(18,270)	(23,673)	15,272	52,752	32,689	28,139
Ending balance	1,504,120	1,570,019	1,563,603	1,527,557	1,431,391	1,361,628	1,504,120	1,527,557
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	557	556	555	554	553	551	555	551
Exercise of stock options		1	1		1	2
Other comprehensive income:
Ending balance	557	557	556	554	554	553	557	554
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	556,202	553,627	554,168	537,092	531,546	529,100	554,168	529,100
Stock-based compensation	6,393	5,765	3,659	6,396	5,533	5,053
Exercise of stock options	115	770	386	3,052	1,284	479
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(120)	(4,197)	(4,803)	(357)	(1,467)	(3,135)
Other	31	52	44	(1)	(7)	(123)
Dividends	184	185	173	203	203	172
Other comprehensive income:
Ending balance	562,805	556,202	553,627	546,385	537,092	531,546	562,805	546,385
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(594,649)	(594,823)	(563,481)	(563,853)	(564,077)	(564,376)	(563,481)	(564,376)
Purchase of common stock	(83,022)	0	(31,512)		0	0
Other	195	174	170	191	224	299
Other comprehensive income:
Ending balance	(677,476)	(594,649)	(594,823)	(563,662)	(563,853)	(564,077)	(677,476)	(563,662)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,734,057	1,706,072	1,669,751	1,612,640	1,584,563	1,556,980	1,669,751	1,556,980
Net earnings	36,264	35,626	43,929	38,624	35,731	35,183
Dividends	(7,480)	(7,641)	(7,608)	(7,681)	(7,654)	(7,600)
Other comprehensive income:
Ending balance	1,762,841	1,734,057	1,706,072	1,643,583	1,612,640	1,584,563	1,762,841	1,643,583
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(122,147)	(96,474)	(115,883)	(149,769)	(184,233)	(215,006)	(115,883)	(215,006)
Other comprehensive income:
Pension funded status adjustment, net of tax	216	233	240	269	305	291
Net unrealized gain (loss) on derivative instruments (net of tax)	(786)	(2,233)	3,897	2,718	1,470	2,343
Foreign currency translation adjustment	(18,270)	(23,673)	15,272	52,752	32,689	28,139
Ending balance	(140,987)	(122,147)	(96,474)	(94,030)	(149,769)	(184,233)	(140,987)	(94,030)
Contra-Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(4,001)	(5,355)	(5,355)	(5,273)	(6,724)	(6,724)	(5,355)	(6,724)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	381	1,354			1,451
Other comprehensive income:
Ending balance	(3,620)	(4,001)	(5,355)	(5,273)	(5,273)	(6,724)	(3,620)	(5,273)
Non- redeemable Non- Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,838	3,823	3,821	3,689	3,545	3,537	3,821	3,537
Dividends				19
Dissolution of joint venture			(47)
Other comprehensive income:
Foreign currency translation adjustment	56	15	49	149	144	8
Ending balance	$ 3,894	$ 3,838	$ 3,823	$ 3,857	$ 3,689	$ 3,545	$ 3,894	$ 3,857

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