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Revenue Recognition, Contracts with Customers - Disaggregation of Revenue (Details)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
USD ($)
Segment
Apr. 30, 2022
USD ($)
Apr. 30, 2021
USD ($)
Revenue from Contract with Customer [Abstract]      
Number of customer-centric segments | Segment 2    
Number of reportable segments | Segment 3    
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net $ 2,019,900 $ 2,082,928 $ 1,941,501
Operating Segments      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 2,019,900 2,082,928 1,941,501
Operating Segments | Academic      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 690,408 759,112 769,014
Operating Segments | Academic | Education Publishing      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 481,752 531,705 538,643
Operating Segments | Academic | Professional Learning      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 208,656 227,407 230,371
Operating Segments | Talent      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 249,181 212,473 157,138
Operating Segments | Research      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 1,080,311 1,111,343 1,015,349
Operating Segments | Research | Research      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 926,800    
Operating Segments | Research Publishing and Platforms      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 1,080,311 1,111,343 1,015,349
Operating Segments | Research Publishing and Platforms | Research      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net 926,773 963,715 892,176
Operating Segments | Research Publishing and Platforms | Research Platforms      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net $ 153,538 147,628 123,173
Operating Segments | Research Publishing and Platforms Segment | Research Solutions | Revision of Prior Period, Reclassification, Adjustment [Member]      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Revenue, net   $ 93,300 $ 80,300