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Goodwill and Intangible Assets, Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Activity in Goodwill by Segment [Roll Forward]      
Balance, beginning of period $ 1,116,790    
Acquisitions [1] 136,789    
Foreign translation adjustment 50,761    
Balance, end of period 1,304,340 $ 1,116,790  
Goodwill impairment [2] 0 110,000 $ 0
Research Publishing & Platforms [Member]      
Activity in Goodwill by Segment [Roll Forward]      
Balance, beginning of period 448,130    
Acquisitions [1] 136,789    
Foreign translation adjustment 34,284    
Balance, end of period 619,203 448,130  
Academic & Professional Learning [Member]      
Activity in Goodwill by Segment [Roll Forward]      
Balance, beginning of period 501,091    
Acquisitions [1] 0    
Foreign translation adjustment 11,421    
Balance, end of period 512,512 501,091  
Education Services [Member]      
Activity in Goodwill by Segment [Roll Forward]      
Balance, beginning of period [3] 167,569    
Acquisitions [1] 0    
Foreign translation adjustment 5,056    
Balance, end of period $ 172,625 167,569 [3]  
Goodwill impairment   110,000  
Long-lived assets   $ 434,000  
[1] Refer to Note 4, “Acquisitions,” for more information related to the acquisitions that occurred in the year ended April 30, 2021.
[2] See Note 7, “Restructuring and Related Charges” and Note 11, “Goodwill and Intangible Assets” for these charges by segment.
[3] The Education Services goodwill balance as of April 30, 2020 includes a cumulative pretax noncash goodwill impairment of $110.0 million.