Stock Based Compensation - Summary of Share-Based Compensation Activity (Detail) (USD $)	9 Months Ended
	Apr. 30, 2013
Stock Based Compensation Activity [Line Items]
Shares Available for Grant, Beginning of year	307,344
Shares Available for Grant, Granted	0
Shares Available for Grant, Exercised	0
Shares Available for Grant, Cancelled	0
Shares Available for Grant, End of year	307,344
Options Outstanding, Beginning of year	68,933
Options Outstanding, Granted	0
Options Outstanding, Exercised	0
Options Outstanding, Cancelled	(800)
Options Outstanding, End of year	68,133
Weighted Average Exercise Price, Beginning of year	$ 11.19
Weighted Average Exercise Price, Granted	$ 0
Weighted Average Exercise Price, Exercised	$ 0
Weighted Average Exercise Price, Cancelled	$ 1.40
Weighted Average Exercise Price, End of year	$ 11.30