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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Thousands
Oct. 31, 2021
Apr. 30, 2021
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] $ 843,934 $ 885,261 [2]
Intangible assets with indefinite lives [Abstract]    
Intangible assets with indefinite lives 126,102 130,041 [2]
Intangible assets (excluding goodwill) [Abstract]    
Total intangible assets, net 970,036 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 89,102 93,041 [2]
Content and Publishing Rights [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] 537,493 564,229 [2]
Customer Relationships [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] 254,297 266,477 [2]
Developed Technology [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] 34,206 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] 17,858 19,536 [2]
Covenants Not to Compete [Member]    
Intangible assets with definite lives, net [Abstract]    
Intangible assets with definite lives, net [1] $ 80 $ 58 [2]
[1] Refer to Note 3, “Acquisitions,” for more information related to the acquisition that occurred in the six months ended October 31, 2021.
[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.