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Segment Information - Additional Information (Details) $ in Millions | 12 Months Ended
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Oct. 31, 2017 USD ($) Segment | Oct. 31, 2016 USD ($) | Oct. 31, 2015 USD ($)
Segment Information [Abstract] |  |  |
Number of identified business segment | Segment | 1 |  |
Service agreement revenue | $ | $ 24.4 | $ 26.6 | $ 16.3

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- Definition Segment Information [Abstract] + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Amount of fee and financial service revenue classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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