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Stock-Based Compensation - Performance Shares, RSUs, Restricted Stock and Share Unit Awards (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Apr. 30, 2016
Apr. 30, 2015
Jul. 31, 2015
Additional Disclosures            
Accrual of dividend equivalents, net of reversal       $ 97,000 $ 169,000  
Carrying value at period end $ 523,530,000     523,530,000   $ 72,468,000
Amount included in other liabilities $ 4,776,000     4,776,000   3,633,000
Cash payments to remit employee's minimum statutory tax withholding requirements related to the net settlement of stock-based awards       $ 74,000 420,000  
Performance Shares, RSUs, Restricted Stock and Share Units            
Awards (in Shares)            
Outstanding, Beginning Balance (in shares) 224,405 234,463 224,165 224,165    
Granted (in shares) 9,000   62,440      
Converted to common stock (in shares)   (4,725) (6,988)      
Forfeited (in shares) (1,438) (5,333) (45,154)      
Outstanding, Ending Balance (in shares) 231,967 224,405 234,463 231,967    
Vested, Ending Balance (in shares) 31,181     31,181    
Vested and Expected to Vest, Ending Balance (in shares) 220,551     220,551    
Weighted Average Grant Date Fair Value            
Outstanding, Beginning Balance (in dollars per share) $ 28.41 $ 28.39 $ 28.26 $ 28.26    
Granted (in dollars per share) 21.50   28.35      
Converted to common stock (in dollars per share)   26.77 25.28      
Forfeited (in dollars per share) 28.35 29.07 28.14      
Outstanding, Ending Balance (in dollars per share) 28.14 $ 28.41 $ 28.39 28.14    
Vested, Ending Balance (in dollars per share) 27.15     27.15    
Vested and Expected to Vest, Ending Balance (in dollars per share) $ 28.14     $ 28.14    
Aggregate Intrinsic Value            
Outstanding, Ending Balance $ 5,614,000     $ 5,614,000    
Vested, Ending Balance       755,000    
Vested and Expected to Vest, Ending Balance 5,337,000     5,337,000    
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       $ 97,000    
Dividend equivalents paid       8,000    
Carrying value at period end 414,000     414,000   325,000
Amount included in other liabilities $ 247,000     $ 247,000   $ 306,000