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Common Stock Repurchases (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]    
Options Exercised (309)  
Exercise Price $ 19.04  
Common Stock [Member]
    
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]    
Options Exercised 201,333 14,000
Exercise Price $ 19.59 $ 16.43
Shares Net Settled for Exercise 124,621 7,241
Shares Withheld for Taxes 35,416 [1] 2,519 [1]
Net Shares to Employee 41,296 4,240
Share Price for Withholding $ 31.65 $ 31.77
Tax Withholding (in 000s) $ 1,121 $ 80
[1] Shares withheld for taxes are treated as a repurchase of shares for accounting purposes but do not count against the Company's stock repurchase program.