v3.26.1
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, 2026
Mar. 31, 2025
Goodwill [Roll Forward]    
Balance at beginning of year $ 721,073 $ 682,934
Foreign currency translation adjustment 15,115 (12,682)
Acquisitions 16,236 50,821
Balance at end of year 752,424 721,073
Energy Systems    
Goodwill [Roll Forward]    
Balance at beginning of year 245,747 259,011
Foreign currency translation adjustment 9,975 (13,264)
Acquisitions 0 0
Balance at end of year 255,722 245,747
Motive Power    
Goodwill [Roll Forward]    
Balance at beginning of year 327,046 326,718
Foreign currency translation adjustment 3,972 328
Acquisitions 0 0
Balance at end of year 331,018 327,046
Specialty    
Goodwill [Roll Forward]    
Balance at beginning of year 148,280 97,205
Foreign currency translation adjustment 1,168 254
Acquisitions 16,236 50,821
Balance at end of year $ 165,684 $ 148,280