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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2017 | Oct. 31, 2017 | Apr. 30, 2017 | Oct. 31, 2016
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Intangible assets with indefinite lives |  | $ 223,995 | $ 219,234 | $ 214,906
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Net intangible assets with determinable lives |  | 604,529 | 608,865 | 608,056
Total |  | 828,524 | 828,099 | 822,962
Brands and Trademarks [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Intangible assets with indefinite lives |  | 133,180 | 135,061 | 130,632
Content and Publishing Rights [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Intangible assets with indefinite lives |  | 90,815 | 84,173 | 84,274
Content and Publishing Rights [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Net intangible assets with determinable lives |  | 420,508 | 421,597 | 406,467
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Net intangible assets with determinable lives |  | 166,006 | 169,116 | 182,584
Brands and Trademarks [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Net intangible assets with determinable lives |  | 17,246 | 17,195 | 17,522
Covenants Not to Compete [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Net intangible assets with determinable lives |  | $ 769 | $ 957 | $ 1,483
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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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