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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 85,452 $ 88,786
Work-in-process 25,876 32,547
Finished goods 33,216 40,523
Inventory, Gross 144,544 161,856
LIFO cost less than FIFO cost (17,171) (15,593)
Net inventories $ 127,373 $ 146,263