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Goodwill and Intangible Assets, Goodwill (Details) - USD ($)
 12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Goodwill [Roll Forward]    
Beginning balance [1] $ 1,019,801,000  
Acquisition [2] 110,805,000  
Foreign translation adjustment (34,940,000)  
Ending balance 1,095,666,000 $ 1,019,801,000 [1]
Research [Member]    
Goodwill [Roll Forward]    
Beginning balance [1] 463,419,000  
Acquisition [2] 0  
Foreign translation adjustment (24,908,000)  
Ending balance 438,511,000 463,419,000 [1]
Publishing [Member]    
Goodwill [Roll Forward]    
Beginning balance [1] 283,851,000  
Acquisition [2] 0  
Foreign translation adjustment (706,000) (11,600)
Ending balance 283,145,000 283,851,000 [1]
Solutions [Member]    
Goodwill [Roll Forward]    
Beginning balance [1] 272,531,000  
Acquisition [2] 110,805,000  
Foreign translation adjustment (9,326,000) 11,600
Ending balance $ 374,010,000 $ 272,531,000 [1]
[1] The April 30, 2018 goodwill balances were revised for the Publishing segment which decreased and the Solutions segment which increased to reflect foreign translation adjustments of $11.6 million.
[2] Refer to Note 4, "Acquisition," in the Notes to Consolidated Financial Statements for more information related to the acquisition of Learning House on November 1, 2018.