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Retirement plan - Additional Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Oct. 31, 2015 | Oct. 31, 2014
Compensation And Retirement [Line Items] |  |
Pension and Other Postretirement Benefit Contributions | $ 160,000 | $ 152,000
Percentage Of Employee Contribution Paid | 3.00% |

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- Definition Represents the percentage of employee earnings under contribution plan. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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