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Stock Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Allocated Share-based Compensation Expense $ 1,777 $ 2,521 $ 4,377 $ 6,868
Total stock compensation expense, net of tax 1,102 1,538 2,714 4,190
Unrealized compensation cost related to share-based compensation, pre tax 9,403   9,403  
Weighted average period remaining     2 years  
Weighted-average fair value of options granted during the period (USD per share)     $ 9.17 $ 9.01
Proceeds from Stock Options Exercised 5,685 2,725 10,894 4,409
Tax benefit on options exercised 316 630 788 1,265
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     2,020 4,216
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 6,338 $ 10,832
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 4,144,742   4,144,742  
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized For Future Issuance 3,932,311   3,932,311  
Service Based Option [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares outstanding, new grants     375,272  
Weighted average exercise price (USD per share)     $ 30.98  
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. 3,274,218 4,049,293 3,274,218 4,049,293
Weighted average exercise price of options exercisable $ 31.14 $ 30.19 $ 31.14 $ 30.19