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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders		$ 47,424	$ 111,334	$ 93,284
Basic weighted-average number of common shares outstanding (in shares)	42,392,039	42,133,484	42,524,189	42,073,015
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	316,043	640,222	389,069	600,829
Diluted weighted-average number of common shares outstanding (in shares)	42,708,082	42,773,706	42,913,258	42,673,844
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.48	$ 1.13	$ 2.62	$ 2.22
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.47	$ 1.11	$ 2.59	$ 2.19
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	1,005,326	409,425	831,068	286,755
Redeemable Noncontrolling Interest [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net earnings attributable to EnerSys stockholders	$ 62,698

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