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Stock-Based Compensation (Details Textuals) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Oct. 31, 2011
Year
Oct. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Cash received from exercise of stock options $ 683 $ 2,105
Tax benefit on options exercised 469 440
Total intrinsic value of options exercised 642 1,320
Total fair value of stock options vested 6,935 3,685
Stock Based Compensation (Textuals) [Abstract]    
Total stock compensation expense 3,591 4,069
Total stock compensation expense, net of tax 2,190 2,482
Unrealized compensation cost related to share-based compensation, pre tax $ 22,882  
Weighted average period remaining 2.3  
Stock options exercisable 3,975,963 3,301,195
Weighted average exercise price of options exercisable $ 29.83 $ 29.10
Class A Nonvoting Common Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of service based stock options Generally vest ratably over a three-year period, with one-third becoming exercisable one year after the grant date and one-third additional in each of the succeeding two years  
Outstanding stock options and restricted shares of Class A Nonvoting Common Stock 6,885,999  
Future issuance of stock option and restricted shares 5,020,700  
Performance Based Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period of options 10 years  
Weighted average exercise price $ 29.55 $ 28.35
Weighted-average fair value of options granted during the period $ 10.01 $ 9.82
Performance Based Stock Options Granted 415,000  
Service Based Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period of options 10 years  
Weighted average exercise price $ 27.00 $ 29.09
Weighted-average fair value of options granted during the period $ 8.37 $ 9.58
Service Based Stock Options Granted 791,150  
Performance Based Restricted Shares [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average exercise price   $ 28.35
Weighted-average fair value of options granted during the period   $ 28.35
Performance based restricted shares outstanding 310,000 210,000
Service Based Stock Options Granted 0  
Performance Based Restricted Shares [Member] | Frank M. Jaehnert
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average exercise price $ 0.00  
Weighted-average fair value of options granted during the period $ 0.00  
Performance based restricted shares outstanding   100,000
Service Based Stock Options Granted 0  
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of service based stock options Either a five-year period or a seven-year period