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Acquisitions - Pro Forma Information (Details) - Alpha - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Net sales	$ 3,278,646	$ 3,124,527
Net earnings attributable to EnerSys stockholders	$ 207,904	$ 126,965
Net earnings per share attributable to EnerSys stockholders - basic	$ 4,790	$ 2,900
Net earnings per share attributable to EnerSys stockholders - assuming dilution	$ 4,710	$ 2,870

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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+ References

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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