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Stockholders' Equity - Reclassification from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Jan. 03, 2021 | Oct. 04, 2020 | Jul. 05, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | $ 2,238,782 | $ 2,301,148 | $ 2,104,612
Income tax expense |  |  |  |  |  |  |  |  | 26,761 | 9,821 | 21,584
Net earnings attributable to EnerSys stockholders | $ (33,836) | $ (38,624) | $ (35,731) | $ (35,183) | $ 1,523 | $ (27,305) | $ (62,698) | $ (48,636) | (143,374) | (137,116) | (160,239)
Net unrealized gain (loss) on derivative instruments | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | 7,903 | 1,151 | 15,281
Income tax expense |  |  |  |  |  |  |  |  | (1,870) | (272) | (3,590)
Net earnings attributable to EnerSys stockholders |  |  |  |  |  |  |  |  | 6,033 | 879 | 11,691
Pension funded status adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax expense |  |  |  |  |  |  |  |  | (362) | (282) | (331)
Prior service costs and deferrals |  |  |  |  |  |  |  |  | 1,529 | 1,098 | 1,704
Net earnings attributable to EnerSys stockholders |  |  |  |  |  |  |  |  | $ 1,167 | $ 816 | $ 1,373

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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