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Acquisitions - (Pro Forma Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 30, 2018
Dec. 30, 2018
Business Acquisition [Line Items]    
Net sales $ 800,118  
Net earnings attributable to EnerSys stockholders $ 47,343  
Net earnings per share attributable to EnerSys stockholders - basic $ 1,100  
Net earnings per share attributable to EnerSys stockholders - assuming dilution $ 1,080.00  
Alpha    
Business Acquisition [Line Items]    
Net sales   $ 2,453,729
Net earnings attributable to EnerSys stockholders   $ 163,327
Net earnings per share attributable to EnerSys stockholders - basic   $ 3,780
Net earnings per share attributable to EnerSys stockholders - assuming dilution   $ 3,720