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Acquisitions - Pro Forma Information (Details) - Alpha $ / shares in Units, $ in Thousands | 12 Months Ended
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Mar. 31, 2021 USD ($) $ / shares
Business Acquisition [Line Items] |
Net sales | $ | $ 3,250,332
Net earnings attributable to EnerSys stockholders | $ | $ 181,915
Net earnings per share attributable to EnerSys stockholders - basic (in dollars per share) | $ / shares | $ 4.19
Net earnings per share attributable to EnerSys stockholders - assuming dilution (in dollars per share) | $ / shares | $ 4.12

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