Quarterly report pursuant to Section 13 or 15(d)

Stock Repurchase Program - Additional Information (Detail)

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Stock Repurchase Program - Additional Information (Detail) - USD ($)
6 Months Ended 9 Months Ended
Apr. 30, 2015
Mar. 31, 2014
Jul. 31, 2014
Apr. 30, 2015
Sep. 04, 2013
Equity [Abstract]          
Stock repurchase program, authorized amount   $ 40,000,000     $ 25,000,000
Termination date of repurchase program   Apr. 30, 2015      
Stock repurchased during period, Shares 591,520     0  
Common stock average price $ 9.31        
Repurchases of common stock $ 5,500,000   $ 5,504,000