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Inventories (Tables)
9 Months Ended
Dec. 31, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Inventories consisted of the following (in thousands):
December 31,
2020
March 31,
2020
At cost - FIFO basis:
Raw materials$81,220 $85,452 
Work-in-process22,615 25,876 
Finished goods27,790 33,216 
Total at cost FIFO basis131,625 144,544 
LIFO cost less than FIFO cost(18,179)(17,171)
Net inventories$113,446 $127,373