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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
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 1 Months Ended 9 Months Ended 3 Months Ended 1 Months Ended
Sep. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Jan. 31, 2008
Apr. 30, 2013
Apr. 30, 2012
Jul. 31, 2008
Jan. 08, 2008
Apr. 30, 2013
Nonvoting Common Stock [Member]
Dec. 31, 2012
Cliff-Vested Restricted Shares [Member]
Sep. 30, 2012
Cliff-Vested Restricted Shares [Member]
Apr. 30, 2013
Performance Based Options [Member]
Apr. 30, 2013
Service Based Option [Member]
Apr. 30, 2013
Total unvested stock-based compensation expense reversal [Domain]
Apr. 30, 2013
Unvested performance-based expense reversal [Domain]
Apr. 30, 2013
Unvested restricted stock expense reversal [Member]
Aug. 31, 2010
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Total fair value of stock options vested   $ 7,360 $ 2,987   $ 7,360 $ 2,987                      
Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized For Future Issuance                 4,198,516                
Total intrinsic value of options exercised         10,860 8,035                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 10,000 310,000     310,000     210,000   5,000 5,000           100,000
Restricted stock units outstanding   10,000     10,000                        
Weighted average exercise price (USD per share) $ 30.21     $ 32.83           $ 32.99             $ 28.35
Share-based Compensation   155 2,102   6,964 7,592               2,186 1,286 900  
Total stock compensation expense, net of tax   94 1,282   4,248 4,631                      
Shares outstanding, beginning balance         6,253,751                        
Shares outstanding, new grants                       0 815,450        
Shares outstanding, exercised         (642,579)                        
Shares outstanding, forfeited or expired         (519,272)                        
Shares outstanding, ending balance   5,907,350     5,907,350                        
Options outstanding, exercisable   3,736,320 3,848,048   3,736,320 3,848,048                      
Options outstanding, beginning balance, weighted average exercise price (USD per share)         $ 29.24                        
Options outstanding, new grants, weighted average exercise price (USD per share)                         $ 30.54        
Options outstanding, exercised, weighted average exercise price (USD per share)         $ 21.22                        
Options outstanding, forfeited or expired, weighted average exercise price (USD per share)         $ 30.52                        
Options outstanding, ending balance, weighted average exercise price (USD per share)   $ 30.18     $ 30.18                        
Weighted average exercise price of options exercisable   $ 30.70 $ 29.67   $ 30.70 $ 29.67                      
Options outstanding, ending balance, weighted average remaining contractual term         6 years 6 months                        
Options outstanding, exercisable, weighted average remaining contractual term         4 years 10 months 13 days                        
Options outstanding, ending balance, aggregate intrinsic value   25,094     25,094                        
Options outstanding, exercisable, aggregate intrinsic value   15,728     15,728                        
Proceeds from Stock Options Exercised   $ 5,837 $ 1,441   $ 10,246 $ 3,624                      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 30.21           $ 32.83     $ 32.99     $ 9.05       $ 28.35