Quarterly report pursuant to Section 13 or 15(d)

Inventories - Major Classifications of Inventories (Detail)

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Inventories - Major Classifications of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 2,616 $ 2,787
Work in process 19,722 20,553
Finished products 1,259 1,330
Total $ 23,597 $ 24,670