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, 2015
Mar. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 1,952 $ 2,763
Work in process 10,285 13,685
Finished products 654 689
Inventory Gross 12,891 17,137
Less - progress payments 2,237 3,143
Total $ 10,654 $ 13,994