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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Intangible assets with definite lives, net [Abstract] |  |  |
Intangible assets with definite lives, net | $ 867,156 | $ 885,261 | [1]
Intangible assets with indefinite lives [Abstract] |  |  |
Intangible assets with indefinite lives | 128,457 | 130,041 | [1]
Intangible assets (excluding goodwill) [Abstract] |  |  |
Total intangible assets, net | 995,613 | 1,015,302 | [1]
Brands and Trademarks [Member] |  |  |
Intangible assets with indefinite lives [Abstract] |  |  |
Intangible assets with indefinite lives | 37,000 | 37,000 | [1]
Accumulated impairment |  | 93,100 |
Content and Publishing Rights [Member] |  |  |
Intangible assets with indefinite lives [Abstract] |  |  |
Intangible assets with indefinite lives | 91,457 | 93,041 | [1]
Content and Publishing Rights [Member] |  |  |
Intangible assets with definite lives, net [Abstract] |  |  |
Intangible assets with definite lives, net | 552,624 | 564,229 | [1]
Customer Relationships [Member] |  |  |
Intangible assets with definite lives, net [Abstract] |  |  |
Intangible assets with definite lives, net | 259,158 | 266,477 | [1]
Developed Technology [Member] |  |  |
Intangible assets with definite lives, net [Abstract] |  |  |
Intangible assets with definite lives, net | 36,667 | 34,961 | [1]
Accumulated impairment |  | 2,800 |
Brands and Trademarks [Member] |  |  |
Intangible assets with definite lives, net [Abstract] |  |  |
Intangible assets with definite lives, net | 18,684 | 19,536 | [1]
Covenants Not to Compete [Member] |  |  |
Intangible assets with definite lives, net [Abstract] |  |  |
Intangible assets with definite lives, net | $ 23 | $ 58 | [1]
[1] | The developed technology balance as of April 30, 2021 is presented net of accumulated impairments and write-offs of $2.8 million. The indefinite-lived brands and trademarks as of April 30, 2021 is net of accumulated impairments of $93.1 million.

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