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Inventories - Schedule of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	May 31, 2013
Inventory Disclosure [Abstract]
Raw materials	$ 5,833	$ 5,104
Work in process	2,509	2,863
Finished goods	1,623	765
Total inventories	$ 9,965	$ 8,732

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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 raw materials 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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-Name Regulation S-X (SX)

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