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Earnings Per Share - Weighted Average Common Shares Basic and Common Shares Diluted (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Jan. 03, 2021	Oct. 04, 2020	Jul. 05, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 33,836	$ 38,624	$ 35,731	$ 35,183	$ (1,523)	$ 27,305	$ 62,698	$ 48,636	$ 143,374	$ 137,116	$ 160,239
Basic (in shares)									42,548,449	42,411,834	42,335,023
Dilutive effect of:
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)									675,954	484,941	673,929
Diluted weighted-average number of common shares outstanding (in shares)									43,224,403	42,896,775	43,008,952
Basic earnings per common share attributable to EnerSys stockholders (usd per share)	$ 0.79	$ 0.91	$ 0.84	$ 0.83	$ (0.04)	$ 0.65	$ 1.48	$ 1.14	$ 3.37	$ 3.23	$ 3.79
Diluted earnings per common share attributable to EnerSys stockholders (usd per share)	$ 0.78	$ 0.89	$ 0.83	$ 0.82	$ (0.04)	$ 0.64	$ 1.47	$ 1.13	$ 3.32	$ 3.20	$ 3.73
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)									281,483,000	698,546,000	355,728,000

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