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Components of Inventory (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2013	Jul. 31, 2012
Schedule of Inventory [Line Items]
Purchased components and parts	$ 15,015	$ 13,811
Units-in-progress	3,302	3,045
Finished units	11,033	11,994
Total inventories	$ 29,350	$ 28,850

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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