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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2024
Jan. 31, 2023
Jan. 31, 2024
Jan. 31, 2023
Apr. 30, 2023
Goodwill [Roll Forward]          
Balance, beginning of period     $ 1,204,050    
Impairment $ (81,754) $ (99,800) (108,449) $ (99,800)  
Balance, end of period 1,096,674   1,096,674   $ 1,204,050
Cumulative pretax noncash goodwill impairment         209,800
Continuing Operations and Disposal Group, Held-for-Sale          
Goodwill [Roll Forward]          
Impairment     (108,449)    
Foreign translation adjustment     1,073    
Balance, end of period 1,096,674   1,096,674    
Research and Learning          
Goodwill [Roll Forward]          
Balance, beginning of period     1,095,754    
Foreign translation adjustment     920    
Balance, end of period         1,095,754
Research          
Goodwill [Roll Forward]          
Balance, beginning of period     609,729    
Foreign translation adjustment     3,436    
Balance, end of period 613,165   613,165   609,729
Learning          
Goodwill [Roll Forward]          
Balance, beginning of period     486,025    
Foreign translation adjustment     (2,516)    
Balance, end of period 483,509   483,509   486,025
Held for Sale or Sold          
Goodwill [Roll Forward]          
Balance, beginning of period     108,296    
Impairment     (108,449)    
Foreign translation adjustment     153    
Balance, end of period $ 0   $ 0   $ 108,296