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Stock-Based Compensation - Summary of Stock Option Activity under Company's Share-Based Compensation Plans (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Service Based Option [Member]
Jul. 31, 2013
Service Based Option [Member]
Jan. 31, 2013
Service Based Option [Member]
Jan. 31, 2014
Service Based Restricted Shares and Restricted Stock Units [Member]
Jul. 31, 2013
Service Based Restricted Shares and Restricted Stock Units [Member]
Jan. 31, 2014
Performance Based Restricted Shares and Restricted Stock Units [Member]
Jul. 31, 2013
Performance Based Restricted Shares and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number               111,345 5,000 80,000 231,667
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value               $ 31.02 $ 32.99 $ 32.50 $ 31.43
Share-based Compensation     $ 4,377 $ 6,868              
Total stock compensation expense, net of tax 1,102 1,538 2,714 4,190              
Shares outstanding, new grants         375,272     108,055   0  
Shares outstanding, exercised         (407,507)            
Shares outstanding, forfeited or expired         (545,070)            
Shares outstanding, ending balance         4,529,280 5,106,585          
Options outstanding, exercisable         3,274,218   4,049,293        
Options outstanding, beginning balance, weighted average exercise price (USD per share)         $ 30.68            
Options outstanding, new grants, weighted average exercise price (USD per share)         $ 30.98            
Options outstanding, exercised, weighted average exercise price (USD per share)         $ 26.99            
Options outstanding, forfeited or expired, weighted average exercise price (USD per share)               $ 31.07   $ 31.61  
Options outstanding, ending balance, weighted average exercise price (USD per share)         $ 30.84            
Weighted average exercise price of options exercisable         $ 31.14   $ 30.19        
Options outstanding, ending balance, weighted average remaining contractual term     5 years 9 months                
Options outstanding, exercisable, weighted average remaining contractual term     4 years 8 months                
Options outstanding, ending balance, aggregate intrinsic value 2,059   2,059                
Options outstanding, exercisable, aggregate intrinsic value 1,957   1,957                
Proceeds from Stock Options Exercised $ 5,685 $ 2,725 $ 10,894 $ 4,409              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 9.17 $ 9.01           $ 0  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period                   (35,001)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period               (1,710)   (116,666)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price         $ 32.30