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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 160,627	$ 119,833	$ 158,223
Other comprehensive income (loss):
Net unrealized gain (loss) on derivative instruments, net of tax	3,295	(5,400)	1,587
Pension funded status adjustment, net of tax	1,712	3,052	(3,694)
Foreign currency translation adjustment	(106,555)	113,739	(53,730)
Total other comprehensive (loss) income, net of tax	(101,548)	111,391	(55,837)
Total comprehensive income	59,079	231,224	102,386
Comprehensive (income) loss attributable to noncontrolling interests	(195)	523	(2,353)
Comprehensive income attributable to EnerSys stockholders	$ 59,274	$ 230,701	$ 104,739

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