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Stock-Based Compensation Performance Shares, RSUs, Restricted Stock and Share Unit Awards (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2014
Jul. 31, 2013
Jan. 31, 2014
Performance Shares, RSUs, Restricted Stock and Share Units
Oct. 31, 2013
Performance Shares, RSUs, Restricted Stock and Share Units
Jan. 31, 2014
Performance Shares
Granted prior to fiscal 2014
Jan. 31, 2014
Performance Shares
Granted during the period
Jan. 31, 2014
Performance Shares
Granted during the period
Jan. 31, 2014
Performance Shares
Granted in fiscal 2012
Jan. 31, 2014
RSUs and restricted stock
Non-Employee Director [Member]
Jan. 31, 2014
RSUs and restricted stock
Employees [Member]
Jan. 31, 2014
Dividend Equivalents
Jul. 31, 2013
Dividend Equivalents
Awards (in Shares)                        
Outstanding, Beginning Balance     165,992 102,334                
Granted     4,988 68,167       35,003        
Converted to common stock     0 (4,509)                
Forfeited     (9,570)                  
Outstanding, Ending Balance     161,410 165,992                
Vested, Ending Balance     12,529                  
Vested and Expected to Vest, Ending Balance     156,337                  
Weighted Average Grant Date Fair Value                        
Outstanding, Beginning Balance     $ 25.28 $ 25.80                
Granted     $ 31.32 $ 24.58                
Converted to common stock     $ 0.00 $ 26.25                
Forfeited     $ 24.82                  
Outstanding, Ending Balance     $ 25.50 $ 25.28                
Vested, Ending Balance     $ 26.93                  
Vested and Expected to Vest, Ending Balance     $ 25.51                  
Aggregate Intrinsic Value                        
Outstanding, Ending Balance     $ 4,910,000                  
Vested, Ending Balance     381,000                  
Vested and Expected to Vest, Ending Balance     4,756,000                  
Additional Disclosures                        
Vesting period (in years)         5 years 3 months 19 days 3 years 3 years   3 years 5 years    
Granted     4,988 68,167       35,003        
Vested               6,996        
Converted into common stock, net of reduction of shares for minimum tax withholding and deferral requirements               3,496        
Reduction of shares retained to satisfy minimum tax withholding               1,013        
Reduction of shares retained for deferral requirements               2,487        
Accrued at period end $ 275,269,000 $ 277,753,000                 $ 58,000 $ 7,000