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Stockholders' Equity (Details) - USD ($)
6 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Mar. 10, 2016
Mar. 09, 2016
Dec. 09, 2015
Sep. 28, 2015
Stock Repurchase Program            
Stock repurchase program, remaining authorized repurchase amount $ 8,664,000          
Maximum amount authorized by the Board of Directors for repurchases of the Company's common stock $ 100,000,000          
Repurchases of common stock (in shares) 0 0        
Dividends            
Targeted annual dividend per share (in dollars per share) $ 1.20 $ 1.20        
Quarterly dividend payment amount per share (in dollars per share)         $ 0.30 $ 0.30
Subsequent Event            
Stock Repurchase Program            
Stock repurchase program, remaining authorized repurchase amount       $ 8,664,000    
Dividends            
Quarterly dividend payment amount per share (in dollars per share)     $ 0.30