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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
 9 Months Ended
Jan. 31, 2025
Apr. 30, 2024
Goodwill [Roll Forward]    
Balance, beginning of period $ 1,091,368,000  
Balance, end of period 1,079,175,000  
Goodwill 1,079,175,000 $ 1,091,368,000
Continuing Operations and Disposal Group, Held-for-Sale    
Goodwill [Roll Forward]    
Balance, beginning of period 1,091,368,000  
Foreign Translation Adjustment (12,193,000)  
Balance, end of period 1,079,175,000  
Goodwill 1,079,175,000 1,091,368,000
Research and Learning    
Goodwill [Roll Forward]    
Balance, beginning of period 1,091,368,000  
Foreign Translation Adjustment (12,193,000)  
Balance, end of period 1,079,175,000  
Goodwill 1,079,175,000 1,091,368,000
Research    
Goodwill [Roll Forward]    
Balance, beginning of period 607,289,000  
Foreign Translation Adjustment (10,838,000)  
Balance, end of period 596,451,000  
Goodwill 596,451,000 607,289,000
Learning    
Goodwill [Roll Forward]    
Balance, beginning of period 484,079,000  
Foreign Translation Adjustment (1,355,000)  
Balance, end of period 482,724,000  
Goodwill 482,724,000 484,079,000
Held for Sale or Sold    
Goodwill [Roll Forward]    
Balance, beginning of period 0  
Foreign Translation Adjustment 0  
Balance, end of period 0  
Cumulative pretax noncash goodwill impairment   318,200,000
Goodwill $ 0 $ 0