Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Dec. 31, 2017	Jan. 01, 2017
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (25,779)	$ 37,095	$ 65,694	$ 124,507
Other comprehensive (loss) income:
Net unrealized (loss) gain on derivative instruments, net of tax	(587)	(2,017)	29	411
Pension funded status adjustment, net of tax	331	198	996	747
Foreign currency translation adjustment	14,053	(52,754)	86,901	(74,922)
Total other comprehensive gain (loss), net of tax	13,797	(54,573)	87,926	(73,764)
Total comprehensive (loss) income	(11,982)	(17,478)	153,620	50,743
Comprehensive income (loss) attributable to noncontrolling interests	156	648	237	(2,343)
Comprehensive (loss) income attributable to EnerSys stockholders	$ (12,138)	$ (18,126)	$ 153,383	$ 53,086