v3.26.1
Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
 12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2024
Goodwill [Roll Forward]      
Balance, beginning of period $ 1,121,505,000 $ 1,091,368,000  
Acquisition   1,026,000  
Foreign Translation Adjustment   29,111,000  
Balance, end of period 1,132,392,000 1,121,505,000  
Reportable Segment, Aggregation before Other Operating Segment      
Goodwill [Roll Forward]      
Foreign Translation Adjustment 10,887,000    
Balance, end of period 1,132,392,000    
Research      
Goodwill [Roll Forward]      
Balance, beginning of period 639,434,000 607,289,000  
Acquisition   0  
Foreign Translation Adjustment (67,000) 32,145,000  
Balance, end of period 639,367,000 639,434,000  
Learning      
Goodwill [Roll Forward]      
Balance, beginning of period 482,071,000 484,079,000  
Acquisition   1,026,000  
Foreign Translation Adjustment 10,954,000 (3,034,000)  
Balance, end of period $ 493,025,000 482,071,000  
Held for Sale or Sold      
Goodwill [Roll Forward]      
Balance, beginning of period   $ 0  
Goodwill, accumulated impairment loss     $ 318,200,000