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Significant Accounting Policies - Additional Information (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Stock Options [Member]
Significant Accounting Policies [Line Items]
Options for common shares excluded from computation of diluted earning per share	312	276	313	138
Maximum [Member]
Significant Accounting Policies [Line Items]
Ownership percentage in affiliates and joint ventures	50.00%		50.00%

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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