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Goodwill and Intangible Assets, Goodwill (Details)
$ in Thousands
 6 Months Ended
Oct. 31, 2021
USD ($)
Activity in Goodwill by Segment [Roll Forward]  
Balance, beginning of period $ 1,304,340 [1]
Acquisitions 7,893 [2]
Foreign translation adjustment (9,999)
Balance, end of period 1,302,234
Goodwill impairment 110,000
Research Publishing & Platforms [Member]  
Activity in Goodwill by Segment [Roll Forward]  
Balance, beginning of period 619,203 [1]
Acquisitions 7,893 [2]
Foreign translation adjustment (5,104)
Balance, end of period 621,992
Academic & Professional Learning [Member]  
Activity in Goodwill by Segment [Roll Forward]  
Balance, beginning of period 512,512 [1]
Acquisitions 0 [2]
Foreign translation adjustment (4,683)
Balance, end of period 507,829
Education Services [Member]  
Activity in Goodwill by Segment [Roll Forward]  
Balance, beginning of period 172,625 [1]
Acquisitions 0 [2]
Foreign translation adjustment (212)
Balance, end of period $ 172,413
[1] The Education Services goodwill balance as of April 30, 2021 includes a cumulative pretax noncash goodwill impairment of $110.0 million.
[2] Refer to Note 3, “Acquisitions,” for more information related to the acquisition that occurred in the six months ended October 31, 2021.