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Summary of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2015	May 31, 2014
Inventory [Line Items]
Raw materials	$ 3,117	$ 2,924
Work in progress	1,188	894
Finished goods	23,803	21,719
Inventory, Net	$ 28,108us-gaap_InventoryNet	$ 25,537us-gaap_InventoryNet

Carrying amount, net of reserves and adjustments, as of the balance sheet date of merchandise or goods which are partially completed. This inventory is generally comprised of raw materials, labor and factory overhead costs, which require further materials, labor and overhead to be converted into finished goods, and which generally require the use of estimates to determine percentage complete and pricing.

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