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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		9 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Dec. 30, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net earnings (loss) attributable to EnerSys stockholders	$ 48,417	$ (25,847)	$ 141,701	$ 65,576
Basic weighted-average number of common shares outstanding (in shares)	42,337,459	42,125,745	42,161,163	42,837,986
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	765,139	0	655,599	507,940
Diluted weighted-average number of common shares outstanding (in shares)	43,102,598	42,125,745	42,816,762	43,345,926
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.14	$ (0.61)	$ 3.36	$ 1.53
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.12	$ (0.61)	$ 3.31	$ 1.51
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	356,510	279,006	310,007	264,517

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