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Stock-Based Compensation (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Y
Jan. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash received from exercise of stock options $ 1,710 $ 2,804 $ 2,301 $ 4,909
Tax benefit on options exercised 126 263 595 703
Total intrinsic value of options exercised     855 2,505
Total fair value of stock options vested 8,012 6,744 8,012 6,744
Stock Based Compensation (Textual) [Abstract]        
Total stock compensation expense 1,939 2,800 5,506 6,869
Total stock compensation expense, net of tax 1,183 1,708 3,359 4,190
Unrealized compensation cost related to share-based compensation, pre tax $ 18,066   $ 18,066  
Weighted average period remaining     2.2  
Stock options exercisable 4,024,955 3,499,632 4,024,955 3,499,632
Weighted average exercise price of options exercisable $ 29.31 $ 29.28 $ 29.31 $ 29.28
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 6,746,849   6,746,849  
Future issuance of stock option and restricted shares 5,020,700   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 $ 9.87
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       $ 32.83
Weighted-average fair value of options granted during the period       $ 32.83
Performance based restricted shares outstanding 310,000 210,000 310,000 210,000
Performance Based Restricted Shares [Member] | Frank M. Jaehnert
       
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 100,000 100,000 100,000 100,000
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