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Fair Value Measurements Fair Value Measurements (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2018 | Apr. 30, 2018 | Jul. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017
Fair Value Disclosures [Abstract] |  |  |  |  |
Impairment of intangibles | $ 0 | $ 24,400,000 | $ 0 | $ 24,400,000 | $ 0
Fair value of intangible assets |  | $ 0 |  |  |

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- Definition Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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