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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jan. 31, 2018 | Jul. 31, 2017 | Apr. 30, 2017
Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets with indefinite lives | $ 236,209 |  | $ 219,234
Finite-Lived Intangible Assets [Line Items] |  |  |
Net intangible assets with determinable lives | 632,422 |  | 608,865
Total | 868,631 |  | 828,099
Brands and Trademarks [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets with indefinite lives | 140,127 |  | 135,061
Content and Publishing Rights [Member] |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |
Intangible assets with indefinite lives | 96,082 |  | 84,173
Content and Publishing Rights [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net intangible assets with determinable lives | 449,358 |  | 421,597
Customer Relationships [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net intangible assets with determinable lives | 165,572 |  | 169,116
Brands and Trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net intangible assets with determinable lives | 16,784 |  | 17,195
Covenants Not to Compete [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net intangible assets with determinable lives | $ 708 |  | $ 957
Brands [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Net intangible assets with determinable lives |  | $ 1,200 |
Impairment of intangible assets |  | $ 3,600 |
Estimated useful life | 5 years |  |

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + 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 an intangible asset (excluding goodwill) to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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