Earnings Per Share - (Reconciliation from Basic to Diluted Average Common Shares) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 05, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders		$ 48,636
Basic weighted-average number of common shares outstanding (in shares)	42,385,888	42,656,339
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	546,166	462,095
Diluted weighted-average number of common shares outstanding (in shares)	42,932,054	43,118,434
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.83	$ 1.14
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 0.82	$ 1.13
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	386,263	656,810
Redeemable Noncontrolling Interest [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders	$ 35,183