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Stockholders' Equity and Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Dec. 30, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 1,201,111  
Net earnings (loss) attributable to EnerSys stockholders $ 48,417 $ (25,847) 141,701 $ 65,576
Net earnings attributable to noncontrolling interests 197 68 380 118
Net earnings (loss) 48,614 (25,779) 142,081 65,694
Net unrealized loss on derivative instruments, net of tax     (442)  
Pension funded status adjustment, net of tax 204 331 804 996
Foreign currency translation adjustment     (102,090)  
Total other comprehensive (loss) gain, net of tax (10,841) 13,797 (101,728) 87,926
Total comprehensive income 37,773 $ (11,982) 40,353 153,620
Dividends paid to stockholders     (22,280) (22,339)
Purchase of treasury stock     (25,000) $ (121,191)
Reissuance of treasury stock, on LIFO basis, towards Alpha purchase consideration     86,463  
Other, including activity related to equity awards     33,633  
Ending balance $ 1,314,280   $ 1,314,280  
Dividends declared (in dollars per share) $ 0.175 $ 0.175 $ 0.53 $ 0.53
Equity Attributable to EnerSys Stockholders        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 1,195,675  
Net earnings (loss) attributable to EnerSys stockholders     141,701  
Net unrealized loss on derivative instruments, net of tax     (442)  
Pension funded status adjustment, net of tax     804  
Foreign currency translation adjustment     (101,452)  
Total other comprehensive (loss) gain, net of tax     (101,090)  
Total comprehensive income     40,611  
Dividends paid to stockholders     (22,280)  
Purchase of treasury stock     (25,000)  
Reissuance of treasury stock, on LIFO basis, towards Alpha purchase consideration     86,463  
Other, including activity related to equity awards     33,633  
Ending balance $ 1,309,102   1,309,102  
Nonredeemable Noncontrolling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     5,436  
Net unrealized loss on derivative instruments, net of tax     0  
Pension funded status adjustment, net of tax     0  
Foreign currency translation adjustment     (638)  
Total other comprehensive (loss) gain, net of tax     (638)  
Total comprehensive income     (258)  
Dividends paid to stockholders     0  
Purchase of treasury stock     0  
Reissuance of treasury stock, on LIFO basis, towards Alpha purchase consideration     0  
Other, including activity related to equity awards     0  
Ending balance $ 5,178   $ 5,178