Summary of Significant Accounting Policies - Transaction Related to Notes Payable (Detail) (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012
Note payable
Payments	$ (210,000)	$ (168,000)
Former Shareholders [Member]
Note payable
Beginning fair value	3,486,000	3,504,000
Imputed interest	487,000	518,000
Change in estimates	(796,000)	(368,000)
Interest (income) expense	(309,000)	150,000
Payments	(173,000)	(168,000)
Ending fair value	$ 3,004,000	$ 3,486,000