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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Mar. 31, 2025
Inventory Disclosure [Abstract]    
Raw materials $ 178,944 $ 163,053
Work-in-process 35,669 30,349
Finished goods 41,327 37,197
Total at cost FIFO basis 255,940 230,599
LIFO cost less than FIFO cost (38,603) (32,001)
Net inventories $ 217,337 $ 198,598