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, 2023	Jan. 01, 2023	Dec. 31, 2023	Jan. 01, 2023
Earnings Per Share [Abstract]
Net earnings attributable to EnerSys stockholders	$ 76,158	$ 44,410	$ 208,184	$ 109,860
Basic weighted-average number of common shares outstanding (in shares)	40,451,279	40,835,636	40,770,524	40,787,654
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares)	596,614	446,057	706,426	479,666
Diluted weighted-average number of common shares outstanding (in shares)	41,047,893	41,281,693	41,476,950	41,267,320
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.88	$ 1.09	$ 5.11	$ 2.69
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share)	$ 1.86	$ 1.08	$ 5.02	$ 2.66
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares)	427,148	1,200,525	423,955	1,181,550