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Earnings Per Share - Reconciliation from Basic to Diluted Average Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 47,424	$ 43,222	$ 93,284	$ 91,423
Basic weighted-average number of common shares outstanding (in shares)	42,133,484	42,938,131	42,073,015	43,194,107
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	640,222	389,230	600,829	551,111
Diluted weighted-average number of common shares outstanding (in shares)	42,773,706	43,327,361	42,673,844	43,745,218
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.13	$ 1.01	$ 2.22	$ 2.12
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.11	$ 1.00	$ 2.19	$ 2.09
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	409,425	283,674	286,755	257,243

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