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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2023
Jul. 31, 2022
Apr. 30, 2023
Goodwill [Roll Forward]      
Balance, beginning of period $ 1,204,050    
Impairment (26,695) $ 0  
Balance, end of period 1,102,499    
Cumulative pretax noncash goodwill impairment     $ 209,800
Continuing Operations and Disposal Group, Held-for-Sale      
Goodwill [Roll Forward]      
Impairment (26,695)    
Foreign translation adjustment 7,084    
Balance, end of period 1,184,439    
Research and Learning      
Goodwill [Roll Forward]      
Balance, beginning of period 1,095,754    
Foreign translation adjustment 6,745    
Research      
Goodwill [Roll Forward]      
Balance, beginning of period 609,729    
Foreign translation adjustment 9,393    
Balance, end of period 619,122    
Learning      
Goodwill [Roll Forward]      
Balance, beginning of period 486,025    
Foreign translation adjustment (2,648)    
Balance, end of period 483,377    
Held for Sale or Sold      
Goodwill [Roll Forward]      
Balance, beginning of period 108,296    
Impairment (26,695)    
Foreign translation adjustment 339    
Balance, end of period $ 81,940