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Acquisition - Pro Forma Financial Information (Details) - ATS and ATL - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Dec. 30, 2018 | Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Net sales | $ 805,839 | $ 799,416 | $ 2,482,137 | $ 2,302,525
Net earnings (loss) attributable to EnerSys stockholders | $ 62,354 | $ (28,713) | $ 181,941 | $ 66,724
Net earnings (loss) per share attributable to EnerSys stockholders - basic (in usd per share) | $ 1,440 | $ (660) | $ 4,210 | $ 1,520
Net earnings per share attributable to EnerSys stockholders - assuming dilution (in usd per share) | $ 1,420 | $ (660) | $ 4,140 | $ 1,500

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