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Stock-Based Compensation - Additional Information (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 31, 2017
USD ($)
compensation_plan
$ / shares
shares
Oct. 31, 2016
USD ($)
$ / shares
shares
Oct. 31, 2015
USD ($)
shares
May 12, 2017
shares
May 12, 2016
shares
May 12, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation, number of plans | compensation_plan 2          
Stock options granted (shares) 0 0 0      
Stock options exercised (shares) 0 0 10,000      
Weighted average exercise price (usd per share) | $ / shares   $ 27.36        
Number of shares forfeited 0 0 0      
Long term incentive plan, description Long Term Incentive Plan is based on three-year performance periods          
Long-term incentive plan, requisite service period 3 years          
Payments for employee long term incentive plan paid in cash 50.00%          
Payments for employee long term incentive plan in restricted shares 50.00%          
Share based compensation expense | $ $ 2.9 $ 2.8 $ 2.8      
Long Term Incentive Plan Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares of restricted stock (shares)   31,075        
Weighted average grant date fair value (usd per share) | $ / shares   $ 53.80        
Share based compensation expense | $ $ 1.7 $ 1.5 1.4      
2005 Outside Directors Equity Award Plan Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares of restricted stock (shares) 19,368 42,435        
Weighted average grant date fair value (usd per share) | $ / shares $ 58.08 $ 26.51        
Share based compensation expense | $ $ 1.1 $ 1.1 1.1      
Class A Common Stock 2001 Plan | Officer            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation expense | $ $ 0.1 $ 0.2 $ 0.3      
Grants in the period (shares)     15,000      
Vesting installments (shares)       5,000 5,000 5,000