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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
Jul. 04, 2021
Jul. 05, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Net earnings attributable to EnerSys stockholders $ 43,929 $ 35,183
Basic weighted-average number of common shares outstanding (in shares) 42,700,329 42,385,888
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares) 837,015 546,166
Diluted weighted-average number of common shares outstanding (in shares) 43,537,344 42,932,054
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share) $ 1.03 $ 0.83
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share) $ 1.01 $ 0.82
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares) 165,386 386,263
RSUs    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Vested restricted stock units (in shares) 65,213