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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended
Oct. 31, 2022
Apr. 30, 2022
Goodwill [Roll Forward]    
Balance, beginning of period $ 1,302,142  
Foreign translation adjustment (33,830)  
Balance, end of period 1,268,312  
Cumulative pretax noncash goodwill impairment   $ 110,000
Research    
Goodwill [Roll Forward]    
Balance, beginning of period 610,416  
Foreign translation adjustment (26,417)  
Balance, end of period 583,999  
Academic & Professional Learning    
Goodwill [Roll Forward]    
Balance, beginning of period 498,136  
Foreign translation adjustment (6,322)  
Balance, end of period 491,814  
Education Services    
Goodwill [Roll Forward]    
Balance, beginning of period 193,590  
Foreign translation adjustment (1,091)  
Balance, end of period $ 192,499