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Income taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2019	Jul. 31, 2018	Oct. 31, 2018	Oct. 31, 2017
Disclosure Income Taxes Additional Information [Abstract]
Provision for income tax as percentage of income (loss) before income taxes	22.00%	19.00%	22.00%	20.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%	35.00%
Unrecognized tax benefits, inclusive of interest and penalties	$ 90,000		$ 90,000		$ 58,000
Unrecognized tax benefits	$ 21,000		$ 21,000

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Disclosure Income Taxes Additional Information [Abstract]

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Total Provision as Percentage Of Pre-Tax Income.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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