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Earnings per share - Computation of Basic and Diluted Weighted Average Shares Outstanding (Detail) - shares	3 Months Ended		9 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018
Earnings Per Share [Abstract]
Weighted average shares outstanding for basic earnings per share	9,363,528	9,202,095	9,343,067	9,045,340
Add effects of potentially dilutive securities-assumed exercise of stock options	509,371	527,513	506,822	397,272
Weighted average shares outstanding for diluted earnings per share	9,872,899	9,729,608	9,849,889	9,442,612

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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