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Components of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 31,411 $ 24,468
Work-in-progress 35,008 35,195
Finished goods 23,669 21,279
Inventories $ 90,088 $ 80,942