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Significant Accounting Policies - Additional Information (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2016
Apr. 30, 2015
Significant Accounting Policies [Line Items]        
Ownership percentage in affiliates and joint ventures 50.00%   50.00%  
Stock Options [Member]        
Significant Accounting Policies [Line Items]        
Options for common shares excluded from computation of diluted earning per share 542 312 791 313