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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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