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Acquisition - Pro Forma Financial Information (Details) - ATS and ATL - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Dec. 30, 2018	Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net sales	$ 805,839	$ 799,416	$ 2,482,137	$ 2,302,525
Net earnings (loss) attributable to EnerSys stockholders	$ 62,354	$ (28,713)	$ 181,941	$ 66,724
Net earnings (loss) per share attributable to EnerSys stockholders - basic (in usd per share)	$ 1,440	$ (660)	$ 4,210	$ 1,520
Net earnings per share attributable to EnerSys stockholders - assuming dilution (in usd per share)	$ 1,420	$ (660)	$ 4,140	$ 1,500

X

- Definition

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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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.

+ References

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

+ References

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