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Financial Instruments And Fair Value Measurements - Estimated Fair Values for the Company's Senior Notes and Assets Held by Special Purpose Entities (Detail) - USD ($) $ in Millions | Jan. 31, 2018 | Oct. 31, 2017
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Estimated Fair Value Of Financial Instruments [Line Items] |  |
Assets held by special purpose entities | $ 50.9 | $ 50.9
Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Assets held by special purpose entities | 51.7 | 52.5
Senior Notes due 2019 | Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value | 266.2 | 272.0
Senior Notes due 2021 | Estimate of Fair Value Measurement |  |
Estimated Fair Value Of Financial Instruments [Line Items] |  |
Estimated fair value | $ 298.2 | $ 281.0

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 + Details
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