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Stockholders' Equity and Noncontrolling Interests - (Other Disclosures) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						6 Months Ended	9 Months Ended
	Jan. 01, 2023	Oct. 02, 2022	Jul. 03, 2022	Jan. 02, 2022	Oct. 03, 2021	Jul. 04, 2021	Oct. 02, 2022	Jan. 01, 2023	Jan. 02, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,414,418	$ 1,438,770	$ 1,493,275	$ 1,573,857	$ 1,567,426	$ 1,543,576	$ 1,493,275	$ 1,493,275	$ 1,543,576
Stock-based compensation	6,906	6,534	5,330	6,393	5,765	3,659
Exercise of stock options	947	115	1	115	771	387
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(128)	(5,624)	(633)	(120)	(4,197)	(4,803)
Purchase of common stock	0	0	(22,907)	(83,022)	0	(31,512)
Other	284	304	199	226	226	214
Net earnings	44,410	34,472	30,978	36,264	35,626	43,929
Dividends	(7,140)	(7,138)	(7,108)	(7,296)	(7,456)	(7,435)
Dissolution of joint venture						(47)
Other comprehensive income:
Pension funded status adjustment, net of tax	84	81	89	216	233	240		254	689
Net unrealized gain (loss) on derivative instruments (net of tax)	10,806	2,116	(8,234)	(786)	(2,233)	3,897		4,688	878
Foreign currency translation adjustment	60,565	(56,175)	(52,220)	(18,214)	(23,658)	15,321		(47,830)	(26,551)
Ending balance	$ 1,531,346	1,414,418	1,438,770	$ 1,508,014	$ 1,573,857	$ 1,567,426	1,414,418	$ 1,531,346	$ 1,508,014
Dividends per common share (in dollars per share)	$ 0.175			$ 0.175	$ 0.175	$ 0.175		$ 0.525	$ 0.525
Pension funded status adjustment, tax benefit (expense)	$ 34	34		$ 69	$ 69	$ 68	34
Net unrealized gain (loss) on derivative instrument, income tax expense (benefit)	3,298	647		241	683	1,187	(2,514)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	194	963		381	1,354
Total EnerSys Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,410,940	1,435,078	1,489,373	1,570,019	1,563,603	1,539,755	1,489,373	$ 1,489,373	$ 1,539,755
Stock-based compensation	6,906	6,534	5,330	6,393	5,765	3,659
Exercise of stock options	947	115	1	115	771	387
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(128)	(5,624)	(633)	(120)	(4,197)	(4,803)
Purchase of common stock	0	0	(22,907)	(83,022)	0	(31,512)
Other	284	304	199	226	226	214
Net earnings	44,410	34,472	30,978	36,264	35,626	43,929
Dividends	(7,140)	(7,138)	(7,108)	(7,296)	(7,456)	(7,435)
Other comprehensive income:
Pension funded status adjustment, net of tax	84	81	89	216	233	240
Net unrealized gain (loss) on derivative instruments (net of tax)	10,806	2,116	(8,234)	(786)	(2,233)	3,897
Foreign currency translation adjustment	60,456	(55,961)	(52,010)	(18,270)	(23,673)	15,272
Ending balance	1,527,759	1,410,940	1,435,078	1,504,120	1,570,019	1,563,603	1,410,940	1,527,759	1,504,120
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	194	963		381	1,354
Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	0	0	0	0	0	0	0	0	0
Other comprehensive income:
Ending balance	0	0	0	0	0	0	0	0	0
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	559	558	557	557	556	555	557	557	555
Exercise of stock options	1	1	1	0	1	1
Other comprehensive income:
Ending balance	560	559	558	557	557	556	559	560	557
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	577,520	576,294	571,464	556,202	553,627	554,168	571,464	571,464	554,168
Stock-based compensation	6,906	6,534	5,330	6,393	5,765	3,659
Exercise of stock options	946	114		115	770	386
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(128)	(5,624)	(633)	(120)	(4,197)	(4,803)
Other	(30)	28	(41)	31	52	44
Dividends	193	174	174	184	185	173
Other comprehensive income:
Ending balance	585,407	577,520	576,294	562,805	556,202	553,627	577,520	585,407	562,805
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(741,510)	(741,786)	(719,119)	(594,649)	(594,823)	(563,481)	(719,119)	(719,119)	(563,481)
Purchase of common stock	0	0	(22,907)	(83,022)	0	(31,512)
Other	314	276	240	195	174	170
Other comprehensive income:
Ending balance	(741,196)	(741,510)	(741,786)	(677,476)	(594,649)	(594,823)	(741,510)	(741,196)	(677,476)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,834,442	1,807,282	1,783,586	1,734,057	1,706,072	1,669,751	1,783,586	1,783,586	1,669,751
Net earnings	44,410	34,472	30,978	36,264	35,626	43,929
Dividends	(7,333)	(7,312)	(7,282)	(7,480)	(7,641)	(7,608)
Other comprehensive income:
Ending balance	1,871,519	1,834,442	1,807,282	1,762,841	1,734,057	1,706,072	1,834,442	1,871,519	1,762,841
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(257,414)	(203,650)	(143,495)	(122,147)	(96,474)	(115,883)	(143,495)	(143,495)	(115,883)
Other comprehensive income:
Pension funded status adjustment, net of tax	84	81	89	216	233	240
Net unrealized gain (loss) on derivative instruments (net of tax)	10,806	2,116	(8,234)	(786)	(2,233)	3,897
Foreign currency translation adjustment	60,456	(55,961)	(52,010)	(18,270)	(23,673)	15,272
Ending balance	(186,068)	(257,414)	(203,650)	(140,987)	(122,147)	(96,474)	(257,414)	(186,068)	(140,987)
Contra-Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,657)	(3,620)	(3,620)	(4,001)	(5,355)	(5,355)	(3,620)	(3,620)	(5,355)
Other comprehensive income:
Ending balance	(2,463)	(2,657)	(3,620)	(3,620)	(4,001)	(5,355)	(2,657)	(2,463)	(3,620)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	194	963		381	1,354
Non- redeemable Non- Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,478	3,692	3,902	3,838	3,823	3,821	3,902	3,902	3,821
Dissolution of joint venture						(47)
Other comprehensive income:
Foreign currency translation adjustment	109	(214)	(210)	56	15	49
Ending balance	$ 3,587	$ 3,478	$ 3,692	$ 3,894	$ 3,838	$ 3,823	$ 3,478	$ 3,587	$ 3,894

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