Stockholders Equity and Noncontrolling Interests Reclassification from Accumulated Other Comprehensive Income (Details) - USD ($)	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax [Abstract]
Cost of goods sold									$ 2,301,148,000	$ 2,104,612,000	$ 1,920,030,000
Income tax expense		$ 21,000							9,821,000	21,584,000	118,493,000
Net earnings attributable to EnerSys stockholders	$ 1,523,000	$ (27,305,000)	$ (62,698,000)	$ (48,636,000)	$ (18,538,000)	$ (48,417,000)	$ (47,424,000)	$ (45,860,000)	(137,116,000)	(160,239,000)	(119,594,000)
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									1,151,000	15,281,000	(3,142,000)
Income tax expense									(272,000)	(3,590,000)	610,000
Net earnings attributable to EnerSys stockholders									879,000	11,691,000	(2,532,000)
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									1,098,000	1,704,000	1,771,000
Income tax expense									(282,000)	(331,000)	(411,000)
Net earnings attributable to EnerSys stockholders									$ 816,000	$ 1,373,000	$ 1,360,000