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Stock-Based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Jan. 27, 2014
2011 Management Incentive Plan [Member]
Jan. 09, 2014
2011 Management Incentive Plan [Member]
Apr. 30, 2014
2011 Management Incentive Plan [Member]
Apr. 30, 2011
2011 Management Incentive Plan [Member]
Jan. 09, 2014
2011 Management Incentive Plan [Member]
Employee Stock [Member]
Shares_per_employee
Jan. 09, 2014
2011 Management Incentive Plan [Member]
Restricted Stock [Member]
Apr. 30, 2014
2011 Management Incentive Plan [Member]
Stock Options [Member]
Apr. 30, 2014
2011 Management Incentive Plan [Member]
Stock Options [Member]
Jan. 09, 2014
2011 Management Incentive Plan [Member]
Director [Member]
Directors
Jan. 27, 2014
2011 Management Incentive Plan [Member]
Executive officers [Member]
Restricted Stock [Member]
Apr. 30, 2014
2011 Management Incentive Plan [Member]
Board of Director Members for October Two Thousand Eleven Option Grants [Member]
Maximum [Member]
Apr. 30, 2014
2011 Management Incentive Plan [Member]
Board of Director Members for October Two Thousand Eleven Option Grants [Member]
Maximum [Member]
Stock Options [Member]
Apr. 30, 2014
2011 Management Incentive Plan [Member]
Board of Director Members for April Two Thousand Eleven Option Grants [Member]
Minimum [Member]
Apr. 30, 2014
2011 Management Incentive Plan [Member]
Board of Director Members for April Two Thousand Eleven Option Grants [Member]
Minimum [Member]
Stock Options [Member]
Apr. 30, 2014
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                  
Common stock shares authorized under ESPP           1,500,000                      
Number of non-employee directors                     12            
Restricted shares issued per non-employee directors             1,750                    
Total restricted shares issued to non-employee directors               21,000                  
Restricted stock closing price awarded to executive officers     $ 30.50 $ 32.49                          
Total restricted shares issued to executive officers                       10,774          
Stock options vesting period                           5 years   1 year  
Term of vested stock options                         5 years   2 years    
Weighted-average remaining life of stock options         6 years 1 month 6 days                       4 years 1 month 6 days
Exercisable stock options, weighted-average remaining contractual term         4 years 2 months 12 days                       3 years 8 months 12 days
Stock-based compensation expense $ 303 $ 191             $ 200 $ 300