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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. 31, 2019	Dec. 30, 2018	Dec. 31, 2019	Dec. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders		$ 48,417	$ 138,639	$ 141,701
Basic weighted-average number of common shares outstanding (in shares)	42,286,641	42,337,459	42,445,006	42,161,163
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	552,328	765,139	443,489	655,599
Diluted weighted-average number of common shares outstanding (in shares)	42,838,969	43,102,598	42,888,495	42,816,762
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.65	$ 1.14	$ 3.27	$ 3.36
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.64	$ 1.12	$ 3.23	$ 3.31
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	636,255	356,510	766,130	310,007
Redeemable Noncontrolling Interest [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders	$ 27,305

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