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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Mar. 31, 2019
Inventory [Line Items]    
Raw materials $ 97,546 $ 88,786
Work-in-process 30,978 32,547
Finished goods 39,961 40,523
At cost - FIFO basis: 168,485 161,856
LIFO cost less than FIFO cost (17,517) (15,593)
Net inventories $ 150,968 $ 146,263