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, 2016
Mar. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials and supplies $ 2,782 $ 3,178
Work in process 11,388 11,615
Finished products 708 659
Inventory Gross 14,878 15,452
Less - progress payments 7,017 4,641
Total $ 7,861 $ 10,811