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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, 2018 | Oct. 31, 2017 | Apr. 30, 2018
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |
Total |  | $ 569,034 |  | $ 615,244
Intangible Assets with Indefinite Lives [Abstract] |  |  |  |
Total |  | 218,595 |  | 232,827
Intangible assets (excluding goodwill) [Abstract] |  |  |  |
Total Intangible Assets, Net |  | 787,629 |  | 848,071
Impairment charges |  | 0 | $ 3,600 |
Brands and Trademarks [Member] |  |  |  |
Intangible Assets with Indefinite Lives [Abstract] |  |  |  |
Total |  | 130,460 |  | 138,589
Content and Publishing Rights [Member] |  |  |  |
Intangible Assets with Indefinite Lives [Abstract] |  |  |  |
Total |  | 88,135 |  | 94,238
Brands [Member] |  |  |  |
Intangible assets (excluding goodwill) [Abstract] |  |  |  |
Impairment charges | $ 3,600 |  |  |
Fair value of intangible assets | $ 1,200 |  |  |
Content and Publishing Rights [Member] |  |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |
Total |  | 401,341 |  | 436,760
Customer Relationships [Member] |  |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |
Total |  | 152,803 |  | 161,729
Brands and Trademarks [Member] |  |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |
Total |  | 14,340 |  | 16,100
Covenants Not to Compete [Member] |  |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |  |
Total |  | $ 550 |  | $ 655

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- Definition Amount of assets, net of accumulated impairment, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit. + 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://fasb.org/us-gaap/role/ref/legacyRef -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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