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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 79,981 $ 85,452
Work-in-process 23,067 25,876
Finished goods 27,201 33,216
Inventory, Gross 130,249 144,544
LIFO cost less than FIFO cost (18,761) (17,171)
Net inventories $ 111,488 $ 127,373