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Retirement plan - Additional Information (Detail) - USD ($)	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Compensation And Retirement [Line Items]
Pension and Other Postretirement Benefit Contributions	$ 159,000	$ 144,000
Percentage Of Employee Contribution Paid	3.00%

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- Definition

Represents the percentage of employee earnings under contribution plan.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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