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Inventories (Tables)
12 Months Ended
Mar. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Inventories consisted of the following:
 March 31,
 20212020
At cost—FIFO basis:  
Raw materials$79,981 $85,452 
Work-in-process23,067 25,876 
Finished goods27,201 33,216 
 130,249 144,544 
LIFO cost less than FIFO cost(18,761)(17,171)
Net inventories$111,488 $127,373