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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2023
Jan. 31, 2022
Apr. 30, 2022
Goodwill [Roll Forward]          
Balance, beginning of period     $ 1,302,142    
Acquisitions       $ 3,878  
Impairment of goodwill $ (99,800) $ 0 (99,800) 0  
Foreign translation adjustment     (2,966)    
Balance, end of period 1,203,254   1,203,254    
Cumulative pretax noncash goodwill impairment         $ 110,000
Research          
Goodwill [Roll Forward]          
Balance, beginning of period     610,416    
Acquisitions       0  
Impairment of goodwill     0    
Foreign translation adjustment     (5,132)    
Balance, end of period 605,284   605,284    
Academic          
Goodwill [Roll Forward]          
Balance, beginning of period     442,015    
Acquisitions       3,878  
Impairment of goodwill     (99,800)    
Foreign translation adjustment     (148)    
Balance, end of period 345,945   345,945    
Talent          
Goodwill [Roll Forward]          
Balance, beginning of period     249,711    
Acquisitions       $ 0  
Impairment of goodwill     0    
Foreign translation adjustment     2,314    
Balance, end of period $ 252,025   252,025    
Education Services          
Goodwill [Roll Forward]          
Impairment of goodwill     $ (31,000)