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Stock-Based Compensation - Stock Options (Details) - USD ($)
 3 Months Ended 9 Months Ended
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Additional Disclosures            
Targeted annual dividend per share (in dollars per share)         $ 1.20 $ 1.20
Stock Options            
Awards (in Shares)            
Outstanding, Beginning Balance (in shares) 2,350,258 2,398,498 2,119,683   2,119,683  
Granted (in shares) 43,000 10,000 480,265      
Expired/canceled (in shares) (31,060) (58,240) (182,250)      
Exercised (in shares) 0   (19,200)      
Outstanding, Ending Balance (in shares) 2,362,198 2,350,258 2,398,498   2,362,198  
Exercisable, Ending Balance (in shares) 1,042,962       1,042,962  
Vested and Expected to Vest, Ending Balance (in shares) 2,287,266       2,287,266  
Weighted Average Exercise Price            
Outstanding, Beginning Balance (in dollars per share) $ 29.01 $ 29.04 $ 29.33   $ 29.33  
Granted (in dollars per share) 21.50 20.90 28.00      
Expired/canceled (in dollars per share) 29.34 28.84 29.84      
Exercised (in dollars per share)     27.24      
Outstanding, Ending Balance (in dollars per share) 28.87 $ 29.01 $ 29.04   28.87  
Exercisable, Ending Balance (in dollars per share) 28.59       28.59  
Vested and Expected to Vest, Ending Balance (in dollars per share) $ 28.85       $ 28.85  
Weighted Average Remaining Contractual Term (Years)            
Outstanding, Ending Balance         6 years 8 months 12 days  
Exercisable, Ending Balance         5 years 2 months 1 day  
Vested And Expected To Vest, Ending Balance         6 years 7 months 24 days  
Aggregate Intrinsic Value            
Outstanding, Ending Balance $ 149,000       $ 149,000  
Exercisable, Ending Balance 0       0  
Vested and Expected to Vest, Ending Balance $ 142,000       $ 142,000  
Additional Disclosures            
Exercise price, lower range limit (in dollars per share)         $ 20.90  
Exercise price, upper range limit (in dollars per share)         $ 33.94  
Total intrinsic value of stock-based awards settled       $ 265,000 $ 32,000 $ 2,224,000
Vested Stock Based Awards Net Settled Upon Exercise (in shares)         19,200 293,988
Stock Issued During The Period, Shares, Net Settlement Of Stock-Based Awards         706 47,532
Per share weighted average grant date fair value of stock based awards granted (in dollars per share) $ 3.95     $ 4.53 $ 5.55 $ 6.13
Fair Value Assumptions            
Expected dividend yield 5.58%     4.09% 4.42% 3.55%
Expected volatility 35.80%     27.00% 34.39% 28.12%
Risk-free interest rate 1.39%     1.37% 1.53% 1.61%
Expected life (years) 5 years 15 days     5 years 2 months 19 days 5 years 1 month 24 days 5 years 5 months 12 days
Minimum | Stock Options            
Additional Disclosures            
Contractual term (in years)         5 years 5 years
Vesting period (in years)         3 years  
Maximum | Stock Options            
Additional Disclosures            
Contractual term (in years)         10 years 10 years
Vesting period (in years)         5 years  
Granted since fiscal 2014 | Performance shares            
Additional Disclosures            
Vesting period (in years)           3 years