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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, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Mar. 31, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 18,538	$ 48,417	$ 47,424	$ 45,860	$ 54,018	$ (25,847)	$ 43,222	$ 48,201	$ 160,239	$ 119,594	$ 160,214
Basic (in shares)									42,335,023	42,612,036	43,389,333
Dilutive effect of:
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)									673,929	507,820	623,210
Diluted weighted-average number of common shares outstanding (in shares)									43,008,952	43,119,856	44,012,543
Basic earnings per common share attributable to EnerSys stockholders (usd per share)	$ 0.43	$ 1.14	$ 1.13	$ 1.09	$ 1.29	$ (0.61)	$ 1.01	$ 1.11	$ 3.79	$ 2.81	$ 3.69
Diluted earnings per common share attributable to EnerSys stockholders (usd per share)	$ 0.42	$ 1.12	$ 1.11	$ 1.08	$ 1.27	$ (0.61)	$ 1.00	$ 1.09	$ 3.73	$ 2.77	$ 3.64
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)									355,728,000	59,482,000	1,295,000

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