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Stockholders Equity and Noncontrolling Interests Reclassification from Accumulated Other Comprehensive Income (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  | $ 2,104,612,000 | $ 1,920,030,000 | $ 1,713,115,000
Income tax expense |  | $ 13,483 |  |  |  |  |  |  | 21,584,000 | 118,493,000 | 54,472,000
Net earnings attributable to EnerSys stockholders | $ (18,538,000) | $ (48,417,000) | $ (47,424,000) | $ (45,860,000) | $ (54,018,000) | $ 25,847,000 | $ (43,222,000) | $ (48,201,000) | (160,239,000) | (119,594,000) | (160,214,000)
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 |  |  |  |  |  |  |  |  | 15,281,000 | (3,142,000) | (6,236,000)
Income tax expense |  |  |  |  |  |  |  |  | (3,590,000) | 610,000 | 2,300,000
Net earnings attributable to EnerSys stockholders |  |  |  |  |  |  |  |  | 11,691,000 | (2,532,000) | (3,936,000)
Pension funded status adjustment | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract] |  |  |  |  |  |  |  |  |  |  |
Prior service costs and deferrals |  |  |  |  |  |  |  |  | 1,704,000 | 1,771,000 | 1,431,000
Income tax expense |  |  |  |  |  |  |  |  | (331,000) | (411,000) | (466,000)
Net earnings attributable to EnerSys stockholders |  |  |  |  |  |  |  |  | $ 1,373,000 | $ 1,360,000 | $ 965,000

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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=115205541&loc=SL114868664-224227 + Details
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