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Stock-Based Compensation - Performance Shares, RSUs, Restricted Stock and Share Unit Awards (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2016
Oct. 31, 2015
Jan. 31, 2016
Jan. 31, 2015
Jul. 31, 2015
Additional Disclosures          
Accrual of dividend equivalents, net of reversal     $ (41,000) $ (113,000)  
Carrying value at period end $ 64,298,000   64,298,000   $ 72,468,000
Amount included in other liabilities $ 2,864,000   2,864,000   3,633,000
Cash payments to remit employee's minimum statutory tax withholding requirements related to the net settlement of stock-based awards     $ 73,000 389,000  
Performance Shares, RSUs, Restricted Stock and Share Units          
Awards (in Shares)          
Outstanding, Beginning Balance (in shares) 234,463 224,165 224,165    
Granted (in shares)   62,440      
Converted to common stock (in shares) (4,725) (6,988)      
Forfeited (in shares) (5,333) (45,154)      
Outstanding, Ending Balance (in shares) 224,405 234,463 224,405    
Vested, Ending Balance (in shares) 31,181   31,181    
Vested and Expected to Vest, Ending Balance (in shares) 214,373   214,373    
Weighted Average Grant Date Fair Value          
Outstanding, Beginning Balance (in dollars per share) $ 28.39 $ 28.26 $ 28.26    
Granted (in dollars per share)   28.35      
Converted to common stock (in dollars per share) 26.77 25.28      
Forfeited (in dollars per share) 29.07 28.14      
Outstanding, Ending Balance (in dollars per share) 28.41 $ 28.39 28.41    
Vested, Ending Balance (in dollars per share) 27.15   27.15    
Vested and Expected to Vest, Ending Balance (in dollars per share) $ 28.40   $ 28.40    
Aggregate Intrinsic Value          
Outstanding, Ending Balance $ 4,380,000   $ 4,380,000    
Vested, Ending Balance     609,000    
Vested and Expected to Vest, Ending Balance 4,185,000   4,185,000    
Additional Disclosures          
Total intrinsic value of stock-based awards settled     $ 275,000 $ 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          
Additional Disclosures          
Vesting period (in years)     3 years    
RSUs and restricted stock | Employees          
Additional Disclosures          
Vesting period (in years)     5 years    
Dividend Equivalents          
Additional Disclosures          
Accrual of dividend equivalents, net of reversal     $ (41,000)    
Dividend equivalents paid     8,000    
Carrying value at period end 358,000   358,000   325,000
Amount included in other liabilities $ 214,000   $ 214,000   $ 306,000