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Stockholders' Equity and Noncontrolling Interests - (Noncontrolling Interests) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jul. 01, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 3,730
Net earnings attributable to EnerSys stockholders		$ 45,860
Net earnings attributable to noncontrolling interests		160
Net earnings	48,636	46,020
Pension funded status adjustment, net of tax	237	300
Total other comprehensive loss, net of tax	(5,303)	(70,858)
Total comprehensive income	43,333	(24,838)
Dividends paid to stockholders	(7,499)	(7,371)
Other, including activity related to equity awards	38	$ 6,797
Ending balance	$ 3,647
Dividends declared (in dollars per share)	$ 0.175	$ 0.175
Equity Attributable to EnerSys Stockholders
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to EnerSys stockholders	$ 48,636
Nonredeemable Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to noncontrolling interests	$ 0

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