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Inventories - Schedule of Inventories from Continuing Operations (Detail) - USD ($) $ in Thousands	Aug. 31, 2015	May. 31, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 6,010	$ 5,788
Work in process	3,041	3,137
Finished goods	1,447	83
Total inventories	$ 10,498	$ 9,008

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Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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