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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Apr. 30, 2021
Goodwill [Roll Forward]      
Balance, beginning of period $ 1,302,142    
Acquisitions 3,878    
Impairment (99,800) $ 0 $ 0
Divestitures (5,306)    
Foreign Translation Adjustment 3,136    
Balance, end of period 1,204,050 1,302,142  
Research      
Goodwill [Roll Forward]      
Balance, beginning of period 610,416    
Acquisitions 0    
Impairment 0    
Divestitures 0    
Foreign Translation Adjustment (687)    
Balance, end of period 609,729 610,416  
Academic      
Goodwill [Roll Forward]      
Balance, beginning of period 442,015    
Acquisitions 3,878    
Impairment (99,800)    
Divestitures (5,306)    
Foreign Translation Adjustment (89)    
Balance, end of period 340,698 442,015  
Talent      
Goodwill [Roll Forward]      
Balance, beginning of period 249,711    
Acquisitions 0    
Impairment 0    
Divestitures 0    
Foreign Translation Adjustment 3,912    
Balance, end of period $ 253,623 249,711  
Goodwill, accumulated impairment loss   $ 110,000