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Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill by Business Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Goodwill [Roll Forward]    
Balance at beginning of year $ 676,715 $ 700,640
Foreign currency translation adjustment 1,829 (23,925)
Acquisitions 4,390  
Balance at end of year 682,934 676,715
Energy Systems    
Goodwill [Roll Forward]    
Balance at beginning of year 258,204 279,461
Foreign currency translation adjustment 807 (21,257)
Acquisitions 0  
Balance at end of year 259,011 258,204
Motive Power    
Goodwill [Roll Forward]    
Balance at beginning of year 321,530 323,303
Foreign currency translation adjustment 798 (1,773)
Acquisitions 4,390  
Balance at end of year 326,718 321,530
Specialty    
Goodwill [Roll Forward]    
Balance at beginning of year 96,981 97,876
Foreign currency translation adjustment 224 (895)
Acquisitions 0  
Balance at end of year $ 97,205 $ 96,981