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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
	Jun. 30, 2019	Jul. 01, 2018
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders		$ 45,860
Basic weighted-average number of common shares outstanding (in shares)	42,656,339	42,012,546
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	462,095	561,435
Diluted weighted-average number of common shares outstanding (in shares)	43,118,434	42,573,981
Basic earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.14	$ 1.09
Diluted earnings (loss) per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.13	$ 1.08
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	656,810	164,085

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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