Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 137,116	$ 160,627	$ 119,833
Other comprehensive (loss) income:
Net unrealized (loss) gain on derivative instruments, net of tax	(5,793)	3,295	(5,400)
Pension funded status adjustment, net of tax	(2,003)	1,712	3,052
Foreign currency translation adjustment	(64,721)	(106,555)	113,739
Total other comprehensive (loss) gain, net of tax	(72,517)	(101,548)	111,391
Total comprehensive income	64,599	59,079	231,224
Comprehensive (loss) gain attributable to noncontrolling interests	(193)	(195)	523
Comprehensive income attributable to EnerSys stockholders	$ 64,792	$ 59,274	$ 230,701