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Acquisitions - Pro Forma Information (Details) - Alpha - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Business Acquisition [Line Items]    
Net sales $ 3,250,332 $ 3,124,527
Net earnings attributable to EnerSys stockholders $ 181,915 $ 126,965
Net earnings per share attributable to EnerSys stockholders - basic $ 4,190 $ 2,900
Net earnings per share attributable to EnerSys stockholders - assuming dilution $ 4,120 $ 2,870