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Stockholders' Equity and Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 1,201,111  
Net earnings attributable to EnerSys stockholders $ 47,424 $ 43,222 93,284 $ 91,423
Net earnings (losses) attributable to noncontrolling interests 23 (71) 183 50
Net earnings 47,447 43,151 93,467 91,473
Net unrealized loss on derivative instruments, net of tax     (5,174)  
Pension funded status adjustment, net of tax 300 338 600 665
Foreign currency translation adjustment     (86,313)  
Total other comprehensive (loss) gain, net of tax (20,029) 32,138 (90,887) 74,129
Total comprehensive income 27,418 $ 75,289 2,580 165,602
Dividends paid to stockholders     (14,747) $ (14,967)
Other, including activity related to equity awards     13,858  
Ending balance $ 1,202,802   $ 1,202,802  
Dividends declared (in dollars per share) $ 0.175 $ 0.175 $ 0.35 $ 0.35
Equity Attributable to EnerSys Stockholders        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     $ 1,195,675  
Net earnings attributable to EnerSys stockholders     93,284  
Net unrealized loss on derivative instruments, net of tax     (5,174)  
Pension funded status adjustment, net of tax     600  
Foreign currency translation adjustment     (85,591)  
Total other comprehensive (loss) gain, net of tax     (90,165)  
Total comprehensive income     3,119  
Dividends paid to stockholders     (14,747)  
Other, including activity related to equity awards     13,858  
Ending balance $ 1,197,905   1,197,905  
Nonredeemable Noncontrolling Interests        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning balance     5,436  
Net earnings (losses) attributable to noncontrolling interests     183  
Net unrealized loss on derivative instruments, net of tax     0  
Pension funded status adjustment, net of tax     0  
Foreign currency translation adjustment     (722)  
Total other comprehensive (loss) gain, net of tax     (722)  
Total comprehensive income     (539)  
Dividends paid to stockholders     0  
Other, including activity related to equity awards     0  
Ending balance $ 4,897   $ 4,897