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Inventories - Major Classifications of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018
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Inventory Disclosure [Abstract] |  |
Raw materials and supplies | $ 2,889 | $ 3,095
Work in process | 15,049 | 17,546
Finished products | 1,385 | 1,034
Inventory Gross | 19,323 | 21,675
Less - progress payments |  | 10,109
Total | $ 19,323 | $ 11,566

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