- (Other Disclosures) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 05, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 30, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 1,304,062		$ 1,286,017
Stock-based compensation	5,053		3,874
Exercise of stock options	481		38
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(3,135)		(6,081)
Purchase of common stock			(23,029)
Other	176		(80)
Net earnings	35,183		48,636
Dividends	(7,428)		(7,499)
Other comprehensive income:
Pension funded status adjustment, net of tax	291		237
Net unrealized gain (loss) on derivative instruments (net of tax)	2,343		(2,329)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	28,147		(3,211)
Ending balance	$ 1,365,173		$ 1,296,573
Dividends per common share (in dollars per share)	$ 0.175	$ 0.175	$ 0.175	$ 0.175
Pension funded status adjustment, tax benefit (expense)		$ 86		$ 141
Net unrealized gain (loss) on derivative instruments, tax (benefit) expense		$ 726		$ 720
Preferred Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 0		$ 0
Other comprehensive income:
Ending balance	0		0
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	551		548
Exercise of stock options	2		3
Other comprehensive income:
Ending balance	553		551
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	529,100		512,696
Stock-based compensation	5,053		3,874
Exercise of stock options	479		35
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(3,135)		(6,081)
Other	(123)		(80)
Dividends	172		133
Other comprehensive income:
Ending balance	531,546		510,577
Treasury Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(564,376)		(530,760)
Purchase of common stock			(23,029)
Other	299
Other comprehensive income:
Ending balance	(564,077)		(553,789)
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,556,980		1,450,325
Net earnings	35,183		48,636
Dividends	(7,600)		(7,632)
Other comprehensive income:
Ending balance	1,584,563		1,491,329
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(215,006)		(142,682)
Other comprehensive income:
Pension funded status adjustment, net of tax	291		237
Net unrealized gain (loss) on derivative instruments (net of tax)	2,343		(2,329)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	28,139		(3,128)
Ending balance	(184,233)		(147,902)
Contra-Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(6,724)		(7,840)
Other comprehensive income:
Ending balance	(6,724)		(7,840)
Total EnerSys Stockholders’ Equity
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,300,525		1,282,287
Stock-based compensation	5,053		3,874
Exercise of stock options	481		38
Shares issued under equity awards (taxes paid related to net share settlement of equity awards), net	(3,135)		(6,081)
Purchase of common stock			(23,029)
Other	176		(80)
Net earnings	35,183		48,636
Dividends	(7,428)		(7,499)
Other comprehensive income:
Pension funded status adjustment, net of tax	291		237
Net unrealized gain (loss) on derivative instruments (net of tax)	2,343		(2,329)
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	28,139		(3,128)
Ending balance	1,361,628		1,292,926
Non- redeemable Non- Controlling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	3,537		3,730
Net earnings			0
Other comprehensive income:
Foreign currency translation adjustment (excludes losses related to redeemable noncontrolling interests)	8		(83)
Ending balance	$ 3,545		$ 3,647