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Acquisitions - (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Business Acquisition [Line Items]
Net sales	$ 818,279
Net earnings attributable to EnerSys stockholders	$ 61,035
Net earnings per share attributable to EnerSys stockholders - basic	$ 1,410
Net earnings per share attributable to EnerSys stockholders - assuming dilution	$ 1,390
Alpha
Business Acquisition [Line Items]
Net sales		$ 1,653,571
Net earnings attributable to EnerSys stockholders		$ 119,748
Net earnings per share attributable to EnerSys stockholders - basic		$ 2,770
Net earnings per share attributable to EnerSys stockholders - assuming dilution		$ 2,730

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