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Stock Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation $ 2,600,000 $ 4,399,000
Total stock compensation expense, net of tax 1,586,000 2,683,000
Unrealized compensation cost related to share-based compensation, pre tax 10,753,000  
Weighted average period remaining 2 years 1 month 6 days  
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. 3,466,777 4,231,429
Weighted average exercise price of options exercisable $ 30.93 $ 29.78
Proceeds from Stock Options Exercised 5,209,000 1,684,000
Tax benefit on options exercised 472,000 635,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 1,211 $ 2,033
Service Based Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period of options 10 years  
Shares outstanding, new grants 347,145  
Weighted average exercise price (USD per share) $ 31.07  
Service Based Option [Member] | Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Performance Based Options [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period of options 10 years  
Restricted Stock [Member] | Minimum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years  
Restricted Stock [Member] | Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 7 years  
Class A nonvoting common stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding stock options and restricted shares of Class A Nonvoting Common Stock 5,042,860  
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized For Future Issuance 3,921,653  
Cliff-Vested Restricted Shares [Member] | Maximum [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Service Based Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period of service based stock options 33.33%  
Weighted-average fair value of options granted during the period (USD per share) $ 9.18 $ 8.96
Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares outstanding, new grants 5,000  
Weighted-average fair value of options granted during the period (USD per share) $ 29.70