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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