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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands | Oct. 31, 2019 | Apr. 30, 2019
--- | --- | ---
Intangible Assets with Determinable Lives, net [Abstract] |  |  |
Total |  | $ 660,273 | $ 648,440
Intangible Assets with Indefinite Lives [Abstract] |  |  |
Total |  | 220,340 | 217,132
Intangible assets (excluding goodwill) [Abstract] |  |  |
Total Intangible Assets, Net |  | 880,613 | 865,572
Brands and Trademarks [Member] |  |  |
Intangible Assets with Indefinite Lives [Abstract] |  |  |
Total |  | 134,005 | 130,909
Content and Publishing Rights [Member] |  |  |
Intangible Assets with Indefinite Lives [Abstract] |  |  |
Total |  | 86,335 | 86,223
Content and Publishing Rights [Member] |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |
Total | [1] | 384,364 | 389,172
Customer Relationships [Member] |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |
Total | [1] | 245,822 | 245,830
Brands and Trademarks [Member] |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |
Total | [1] | 11,753 | 12,993
Covenants Not to Compete [Member] |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |
Total |  | 345 | 445
Developed Technology [Member] |  |  |
Intangible Assets with Determinable Lives, net [Abstract] |  |  |
Total | [1] | $ 17,989 | $ 0
[1] | Refer to Note 3, “Acquisitions,” for more information related to the acquisitions that occurred in the six months ended October 31, 2019.

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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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