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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Thousands
Jan. 31, 2022
Apr. 30, 2021
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] $ 847,679 $ 885,261 [2]
Intangible assets with indefinite lives [Abstract]    
Intangible assets with indefinite lives 123,214 130,041 [2]
Intangible assets (excluding goodwill) [Abstract]    
Total intangible assets, net 970,893 1,015,302 [2]
Brands and Trademarks [Member]    
Intangible assets with indefinite lives [Abstract]    
Intangible assets with indefinite lives 37,000 37,000 [2]
Accumulated impairment   93,100
Content and Publishing Rights [Member]    
Intangible assets with indefinite lives [Abstract]    
Intangible assets with indefinite lives 86,214 93,041 [2]
Content and Publishing Rights [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] 522,090 564,229 [2]
Customer Relationships [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] 249,136 266,477 [2]
Developed Technology [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] 58,940 34,961 [2]
Accumulated impairment   2,800
Brands and Trademarks [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] 17,097 19,536 [2]
Covenants Not to Compete [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] $ 416 $ 58 [2]
[1] Refer to Note 3, “Acquisitions,” for more information related to the acquisitions that occurred in the nine months ended January 31, 2022.
[2] 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.