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Inventories (Tables)
9 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Inventories consisted of the following (in thousands):
December 31,
2021
March 31,
2021
At cost - FIFO basis:
Raw materials$122,604 $79,981 
Work-in-process38,655 23,067 
Finished goods35,919 27,201 
Total at cost FIFO basis197,178 130,249 
LIFO cost less than FIFO cost(22,079)(18,761)
Net inventories$175,099 $111,488