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Retirement plan - Additional Information (Detail) - USD ($) | 12 Months Ended
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Oct. 31, 2017 | Oct. 31, 2016
Compensation And Retirement [Line Items] |  |
Pension and Other Postretirement Benefit Contributions | $ 166,000 | $ 182,000
Percentage Of Employee Contribution Paid | 3.00% |

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