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, 2017
Mar. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 3,098 $ 3,016
Work in process 9,183 12,573
Finished products 1,024 891
Inventory Gross 13,305 16,480
Less - progress payments 4,902 7,234
Total $ 8,403 $ 9,246