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Inventories - Schedule of Inventories from Continuing Operations (Detail) - USD ($) $ in Thousands	May. 31, 2015	May. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 5,788	$ 5,135
Work in process	3,137	3,174
Finished goods	83	318
Total inventories	$ 9,008	$ 8,627

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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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