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Unaudited interim condensed consolidated financial statements - Additional Information (Detail) - Accounting Standards Update No. 2016-09, Compensation – Stock Compensation [Member]	9 Months Ended
	Jul. 31, 2018 USD ($)
Recently Issued Accounting Pronouncements Adopted, Income Tax Benefit Recognized	$ 163,000
Recently Issued Accounting Pronouncements Adopted, Reduction of Effective Tax Rate	2.40%

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Tax benefit recognized due to adoption of new ASU.

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- Definition

Reduction of effective tax rate due to adoption of new ASU.

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