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Product Warranties - Summary of Product Warrant Liability (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Schedule Of Product Warranty Liability [Line Items]
Beginning balance	$ 166	$ 185
Warranty cost incurred	(54)	(53)
Accrued warranty cost	47	54
Ending balance	$ 159	$ 186

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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