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Revenue Recognition, Contracts with Customers - Disaggregation of Revenue (Details)
$ in Thousands
 12 Months Ended
Apr. 30, 2024
USD ($)
segment
Apr. 30, 2023
USD ($)
segment
Apr. 30, 2022
USD ($)
Revenue from Contract with Customer [Abstract]      
Number of reportable segments | segment 3 3  
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Total Revenue $ 1,872,987 $ 2,019,900 $ 2,082,928
Operating Segments      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Total Revenue 1,872,987 2,019,900 2,082,928
Operating Segments | Research      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Total Revenue 1,042,705 1,080,311 1,111,343
Operating Segments | Research | Research Publishing      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Total Revenue 892,784 926,773 963,715
Operating Segments | Research | Research Solutions      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Total Revenue 149,921 153,538 147,628
Operating Segments | Learning      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Total Revenue 574,739 546,395 581,208
Operating Segments | Learning | Academic      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Total Revenue 323,541 304,633 331,931
Operating Segments | Learning | Professional      
Revenue from contracts with customers disaggregated by segment and product type [Abstract]      
Total Revenue $ 251,198 $ 241,762 $ 249,277