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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2020
Apr. 30, 2021
Intangible assets with definite lives, net [Abstract]    
Cost [1] $ 1,248,291 $ 1,536,199
Accumulated amortization [1] (559,381) (650,938)
Accumulated impairment [1] (2,841)  
Total [1] 686,069 885,261
Intangible assets with indefinite lives [Abstract]    
Cost 214,443 130,041
Accumulated impairment (93,107)  
Total 121,336 130,041
Intangible assets (excluding goodwill) [Abstract]    
Cost 1,462,734 1,666,240
Accumulated impairment (95,948)  
Total Intangible Assets, Net 807,405 1,015,302
Brands and Trademarks [Member]    
Intangible assets with indefinite lives [Abstract]    
Cost [2] 130,107 37,000
Accumulated impairment [2] (93,107)  
Total [2] 37,000 37,000
Content and Publishing Rights [Member]    
Intangible assets with indefinite lives [Abstract]    
Cost 84,336 93,041
Accumulated impairment 0  
Total 84,336 93,041
Brands [Member]    
Intangible assets (excluding goodwill) [Abstract]    
Impairment charges (BW in FY20) 89,500  
Content and Publishing Rights [Member]    
Intangible assets with definite lives, net [Abstract]    
Cost 806,862 1,062,072
Accumulated amortization (444,756) (497,843)
Accumulated impairment 0  
Total 362,106 564,229
Customer Relationships [Member]    
Intangible assets with definite lives, net [Abstract]    
Cost 377,652 384,462
Accumulated amortization (87,234) (117,985)
Accumulated impairment 0  
Total 290,418 266,477
Developed Technology [Member]    
Intangible assets with definite lives, net [Abstract]    
Cost [2] 19,225 42,785
Accumulated amortization [2] (3,273) (7,824)
Accumulated impairment [2] (2,841)  
Total [2] 13,111 34,961
Brands and Trademarks [Member]    
Intangible assets with definite lives, net [Abstract]    
Cost 42,877 45,630
Accumulated amortization (22,689) (26,094)
Accumulated impairment 0  
Total 20,188 19,536
Covenants Not to Compete [Member]    
Intangible assets with definite lives, net [Abstract]    
Cost 1,675 1,250
Accumulated amortization (1,429) (1,192)
Accumulated impairment 0  
Total $ 246 $ 58
[1] Refer to Note 4, “Acquisitions,” for more information related to the acquisitions that occurred in 2021 and 2020.
[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 cost balance as of April 30, 2021 is net of accumulated impairments of $93.1 million.