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Leases - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Operating Leased Assets [Line Items]
Total future minimum rental payments	$ 2,630
Amounts due in fiscal year 2014	877
Amounts due in fiscal year 2015	654
Amounts due in fiscal year 2016	494
Amounts due in fiscal year 2017	369
Amounts due in fiscal year 2018	236
Rent expense	$ 1,572	$ 1,659	$ 2,015

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