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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2023
Oct. 31, 2022
Apr. 30, 2023
Goodwill [Roll Forward]          
Balance, beginning of period     $ 1,204,050    
Impairment $ 0 $ 0 (26,695) $ 0  
Balance, end of period 1,081,517   1,081,517    
Cumulative pretax noncash goodwill impairment         $ 209,800
Continuing Operations and Disposal Group, Held-for-Sale          
Goodwill [Roll Forward]          
Impairment     (26,695)    
Foreign translation adjustment     (14,676)    
Balance, end of period 1,162,679   1,162,679    
Research and Learning          
Goodwill [Roll Forward]          
Balance, beginning of period     1,095,754    
Foreign translation adjustment     (14,237)    
Research          
Goodwill [Roll Forward]          
Balance, beginning of period     609,729    
Foreign translation adjustment     (15,123)    
Balance, end of period 594,606   594,606    
Learning          
Goodwill [Roll Forward]          
Balance, beginning of period     486,025    
Foreign translation adjustment     886    
Balance, end of period 486,911   486,911    
Held for Sale or Sold          
Goodwill [Roll Forward]          
Balance, beginning of period     108,296    
Impairment     (26,695)    
Foreign translation adjustment     (439)    
Balance, end of period $ 81,162   $ 81,162