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Stock Compensation Plans - Additional Information (Detail) - USD ($)
12 Months Ended 24 Months Ended 36 Months Ended
Feb. 11, 2016
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2017
Oct. 31, 2017
Oct. 31, 2014
Feb. 17, 2011
Feb. 17, 2005
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock compensation plan, maximum shares that may be issued 4,200,000             3,500,000 2,250,000
Stock compensation plan, additional shares that may be issued 700,000                
Share purchase plan, company's matched contributions   25.00%              
Potential accrued compensation cost   $ 4,100,000     $ 700,000        
Stock Purchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share purchase plan, compensation expense related to the matching contribution   $ 392,000 $ 313,000 $ 297,000          
Management | Retainer and Meeting Fees                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share purchase plan, percentage compensation received in the form of restricted stock   100.00%              
Other Participants | Base Salary Compensation                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share purchase plan, percentage compensation received in the form of restricted stock   15.00%              
Other Participants | Deferred Bonus                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share purchase plan, percentage compensation received in the form of restricted stock   75.00%              
Restricted Stock                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock compensation plan, maximum shares that may be issued 2,112,500             1,562,500 562,500
Compensation cost   $ 7,445,000 $ 6,459,000 $ 6,452,000          
Unrecognized share-based compensation costs   $ 10,800,000     $ 10,800,000 $ 10,800,000      
Unvested shares   301,229 293,810 314,300 301,229 301,229 566,050    
Unrecognized share-based compensation costs weighted average period of recognition   1 year 7 months              
Restricted stock awards vested (in shares)   69,294 119,407 327,988          
Restricted stock awards vested, weighted average fair value (in usd per share)   $ 55.50 $ 54.09 $ 44.98          
Restricted stock awards forfeited (in shares)   6,874 3,018 1,362          
Restricted Stock | Stock Purchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock compensation plan, vesting period   3 years              
Share purchase plan, shares of restricted stock issued   9,605 15,075 15,395          
Share purchase plan, value per share of restricted issued (in usd per share)   $ 112.84 $ 84.71 $ 78.53          
Restricted stock awards vested (in shares)   17,034 16,746 21,540          
Restricted stock awards vested, weighted average fair value (in usd per share)   $ 80.62 $ 57.41 $ 51.06          
Restricted stock awards forfeited (in shares)   1,461 484 112          
Restricted Stock | Employer Matched Contribution | Stock Purchase Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share purchase plan, shares of restricted stock issued   2,290 3,650 3,734          
Restricted Stock | Minimum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock compensation plan, vesting period   3 years 3 years 3 years          
Restricted Stock | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Stock compensation plan, vesting period   4 years 4 years 4 years          
Performance Based Awards                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation cost   $ 9,539,000 $ 9,041,000 $ 9,319,000          
Performance share agreements, performance period   2 years 2 years 2 years          
Performance share agreements, additional holding period   1 year 1 year 1 year          
Performance share agreements, percentage of grants made, minimum   50.00% 50.00% 50.00%          
Performance share agreements, percentage of grants made, maximum   200.00% 200.00% 200.00%          
Stock compensation plan, target shares for grant     68,350            
Performance Based Awards | 2014 Performance Share Agreement                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation cost   $ 2,787,000 $ 5,876,000            
Number of shares issued or estimated   102,193              
Shares vested (shares)           102,193      
Vested shares issued (shares)           102,193      
Performance Based Awards | 2015 Performance Share Agreement                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Compensation cost   $ 6,752,000 $ 0            
Number of shares issued or estimated   145,777