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Inventories - Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Schedule Of Inventory [Line Items]
Raw materials	$ 3,462	$ 4,398
Work in process	1,082	2,193
Finished goods	3,925	4,946
Total	$ 8,469	$ 11,537

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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