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Stock-Based Compensation - Performance Shares, RSUs, Restricted Stock and Share Unit Awards (Details) - USD ($)
3 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Additional Disclosures        
Reversal of dividend equivalents, net of accrual $ 10,000 $ (56,000)    
Carrying value at period end 59,932,000   $ 72,468,000  
Amount included in other liabilities 3,178,000   $ 3,633,000  
Cash payments to remit employee's minimum statutory tax withholding requirements related to the net settlement of stock-based awards $ 74,000 89,000    
Performance Shares, RSUs, Restricted Stock and Share Units        
Awards (in Shares)        
Outstanding, Beginning Balance (in shares) 224,165      
Granted (in shares) 62,440      
Converted to common stock (in shares) (6,988)      
Forfeited (in shares) (45,154)      
Outstanding, Ending Balance (in shares) 234,463      
Vested, Ending Balance (in shares) 35,906      
Vested and Expected to Vest, Ending Balance (in shares) 222,759      
Weighted Average Grant Date Fair Value        
Outstanding, Beginning Balance (in dollars per share) $ 28.26      
Granted (in dollars per share) 28.35      
Converted to common stock (in dollars per share) 25.28      
Forfeited (in dollars per share) 28.14      
Outstanding, Ending Balance (in dollars per share) 28.39      
Vested, Ending Balance (in dollars per share) 27.10      
Vested and Expected to Vest, Ending Balance (in dollars per share) $ 28.40      
Aggregate Intrinsic Value        
Outstanding, Ending Balance $ 5,665,000      
Vested, Ending Balance 867,000      
Vested and Expected to Vest, Ending Balance 5,382,000      
Additional Disclosures        
Total intrinsic value of stock-based awards settled $ 173,000 $ 504,000    
Performance Shares | Granted prior to fiscal 2014        
Additional Disclosures        
Vesting period (in years) 5 years 3 months 19 days      
Performance Shares | Granted since fiscal 2014        
Additional Disclosures        
Vesting period (in years) 3 years      
Performance period (in years) 3 years      
RSUs and restricted stock | Non-Employee Director [Member]        
Additional Disclosures        
Vesting period (in years) 3 years      
RSUs and restricted stock | Employees [Member]        
Additional Disclosures        
Vesting period (in years) 5 years      
Share units        
Awards (in Shares)        
Converted to common stock (in shares) 0      
Dividend Equivalents        
Additional Disclosures        
Reversal of dividend equivalents, net of accrual $ (10,000)      
Dividend equivalents paid 5,000      
Carrying value at period end 310,000     $ 325,000
Amount included in other liabilities $ 181,000     $ 306,000