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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 9 Months Ended
Jan. 03, 2021
Dec. 31, 2019
Jan. 03, 2021
Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net earnings attributable to EnerSys stockholders $ 38,624 $ 27,305 $ 109,538 $ 138,639
Basic weighted-average number of common shares outstanding (in shares) 42,599,834 42,286,641 42,502,460 42,445,006
Common shares from exercise and lapse of equity awards, net of shares assumed reacquired (in shares) 690,569 552,328 600,844 443,489
Diluted weighted-average number of common shares outstanding (in shares) 43,290,403 42,838,969 43,103,304 42,888,495
Basic earnings per common share attributable to EnerSys stockholders (in dollars per share) $ 0.91 $ 0.65 $ 2.58 $ 3.27
Diluted earnings per common share attributable to EnerSys stockholders (in dollars per share) $ 0.89 $ 0.64 $ 2.54 $ 3.23
Anti-dilutive equity awards not included in diluted weighted-average common shares (in shares) 120,048 636,255 218,642 766,130
RSUs        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Vested restricted stock units (in shares)     204,694  
Non-employee Directors | RSUs        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Vested restricted stock units (in shares)     29,420