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Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Apr. 30, 2021
 [1]
Acquisitions [Abstract]            
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired       $ 13,615 $ 229  
Revenue   $ 533,003 $ 491,011 1,021,391 922,337  
Operating income (loss)   73,888 $ 69,905 114,856 $ 99,944  
Goodwill   1,302,234   1,302,234   $ 1,304,340
Research Publishing & Platforms [Member]            
Acquisitions [Abstract]            
Goodwill   621,992   621,992   $ 619,203
J&J [Member]            
Acquisitions [Abstract]            
Fair value of consideration transferred       12,000    
Total cash consideration transferred       10,500    
Cash to be paid after acquisition date       1,500    
Goodwill   7,900   7,900    
Intangible assets, net   3,100   $ 3,100    
J&J [Member] | Customer Relationships [Member]            
Acquisitions [Abstract]            
Intangible Assets, weighted average useful life       10 years    
J&J [Member] | Research Publishing & Platforms [Member]            
Acquisitions [Abstract]            
Revenue   700   $ 700    
Operating income (loss)   (100)   (100)    
Hindawi [Member]            
Acquisitions [Abstract]            
Percentage of ownership interest acquired 100.00%          
Fair value of consideration transferred $ 300,100          
Total cash consideration transferred 299,300          
Settlement of preexisting relationship 800          
Cash acquired 1,000          
Fair value of cash consideration transferred, including those amounts paid after acquisition, net of cash acquired 298,300          
Intangible assets, net 194,900          
Hindawi [Member] | Research Publishing & Platforms [Member]            
Acquisitions [Abstract]            
Revenue   13,100   24,600    
Operating income (loss)   $ 3,200   $ 5,100    
Goodwill $ 147,400          
[1] The Education Services goodwill balance as of April 30, 2021 includes a cumulative pretax noncash goodwill impairment of $110.0 million.