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Product Warranties - Summary of Product Warrant Liability (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012
Schedule Of Product Warranty Liability [Line Items]
Beginning balance	$ 166	$ 185
Warranty cost incurred	(81)	(92)
Accrued warranty cost	68	78
Ending balance	$ 153	$ 171

- 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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