Stockholders' Equity and Noncontrolling Interests - (Other Disclosures) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Dec. 31, 2023	Oct. 01, 2023	Jul. 02, 2023	Jan. 01, 2023	Oct. 02, 2022	Jul. 03, 2022	Dec. 31, 2023	Jan. 01, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,663,381	$ 1,683,179	$ 1,603,881	$ 1,414,418	$ 1,438,770	$ 1,493,275	$ 1,603,881	$ 1,493,275
Stock-based compensation	9,817	5,144	7,933	6,906	6,534	5,330
Exercise of stock options	0	2,014	7,654	947	115	1
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(2,144)	(7,348)		(128)	(5,624)	(633)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	0	475		194	963
Purchase of common stock	(34,991)	(47,340)	0	0		(22,907)	(82,331)	(22,907)
Other	232	344	279	284	304	199
Net earnings	76,158	65,229	66,797	44,410	34,472	30,978
Dividends	(9,081)	(9,168)	(7,173)	(7,140)	(7,138)	(7,108)
Dissolution of joint venture						0
Other comprehensive income:
Pension funded status adjustment, net of tax	21	21	20	84	81	89	62	254
Net unrealized gain (loss) on derivative instruments (net of tax)	(6,722)	2,495	1,786	10,806	2,116	(8,234)	(2,441)	4,688
Foreign currency translation adjustment	33,356	(31,664)	2,002	60,565	(56,175)	(52,220)	3,694	(47,830)
Ending balance	$ 1,730,027	$ 1,663,381	1,683,179	$ 1,531,346	1,414,418	$ 1,438,770	$ 1,730,027	$ 1,531,346
Dividends per common share (in dollars per share)	$ 0.225	$ 0.225		$ 0.175		$ 0.175	$ 0.625	$ 0.525
Pension funded status adjustment, tax benefit (expense)	$ 146	$ 6	9	$ 34	34	$ 34
Net unrealized gain (loss) on derivative instrument, income tax expense (benefit)	2,051	762	(544)	3,298	647	2,514
Total EnerSys Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,659,986	1,679,767	1,600,279	1,410,940	1,435,078	1,489,373	$ 1,600,279	$ 1,489,373
Stock-based compensation	9,817	5,144	7,933	6,906	6,534	5,330
Exercise of stock options	0	2,014	7,654	947	115	1
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(2,144)	(7,348)		(128)	(5,624)	(633)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	0	475		194	963
Purchase of common stock	(34,991)	(47,340)	0	0		(22,907)
Other	232	344	279	284	304	199
Net earnings	76,158	65,229	66,797	44,410	34,472	30,978
Dividends	(9,081)	(9,168)	(7,173)	(7,140)	(7,138)	(7,108)
Other comprehensive income:
Pension funded status adjustment, net of tax	21	21	20	84	81	89
Net unrealized gain (loss) on derivative instruments (net of tax)	(6,722)	2,495	1,786	10,806	2,116	(8,234)
Foreign currency translation adjustment	33,258	(31,647)	2,192	60,456	(55,961)	(52,010)
Ending balance	1,726,534	1,659,986	1,679,767	1,527,759	1,410,940	1,435,078	1,726,534	1,527,759
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	563	565	560	559	558	557	560	557
Exercise of stock options	0	(1)	5	1	1	1
Other		(1)
Other comprehensive income:
Ending balance	563	563	565	560	559	558	563	560
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	612,490	612,295	596,464	577,520	576,294	571,464	596,464	571,464
Stock-based compensation	9,817	5,144	7,933	6,906	6,534	5,330
Exercise of stock options	0	2,015	7,649	946	114	0
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(2,144)	(7,348)		(128)	(5,624)	(633)
Other	11	151	65	(30)	28	(41)
Dividends	234	233	184	193	174	174
Other comprehensive income:
Ending balance	620,408	612,490	612,295	585,407	577,520	576,294	620,408	585,407
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(787,888)	(740,742)	(740,956)	(741,510)	(741,786)	(719,119)	(740,956)	(719,119)
Purchase of common stock	(34,991)	(47,340)	0	0		(22,907)
Other	221	194	214	314	276	240
Other comprehensive income:
Ending balance	(822,658)	(787,888)	(740,742)	(741,196)	(741,510)	(741,786)	(822,658)	(741,196)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	2,045,416	1,989,588	1,930,148	1,834,442	1,807,282	1,783,586	1,930,148	1,783,586
Net earnings	76,158	65,229	66,797	44,410	34,472	30,978
Dividends	(9,315)	(9,401)	(7,357)	(7,333)	(7,312)	(7,282)
Other comprehensive income:
Ending balance	2,112,259	2,045,416	1,989,588	1,871,519	1,834,442	1,807,282	2,112,259	1,871,519
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(208,607)	(179,476)	(183,474)	(257,414)	(203,650)	(143,495)	(183,474)	(143,495)
Other comprehensive income:
Pension funded status adjustment, net of tax	21	21	20	84	81	89
Net unrealized gain (loss) on derivative instruments (net of tax)	(6,722)	2,495	1,786	10,806	2,116	(8,234)
Foreign currency translation adjustment	33,258	(31,647)	2,192	60,456	(55,961)	(52,010)
Ending balance	(182,050)	(208,607)	(179,476)	(186,068)	(257,414)	(203,650)	(182,050)	(186,068)
Contra-Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(1,988)	(2,463)	(2,463)	(2,657)	(3,620)	(3,620)	(2,463)	(3,620)
Contra equity - adjustment to indemnification receivable for acquisition related tax liability	0	475		194	963
Other comprehensive income:
Ending balance	(1,988)	(1,988)	(2,463)	(2,463)	(2,657)	(3,620)	(1,988)	(2,463)
Non- redeemable Non- Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,395	3,412	3,602	3,478	3,692	3,902	3,602	3,902
Dissolution of joint venture						0
Other comprehensive income:
Foreign currency translation adjustment	98	(17)	(190)	109	(214)	(210)
Ending balance	$ 3,493	$ 3,395	$ 3,412	$ 3,587	$ 3,478	$ 3,692	$ 3,493	$ 3,587