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Segment Information, Total Assets by Segment (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Segment Information [Abstract]      
Total assets $ 3,168,794 $ 2,948,766 $ 2,839,451
Operating Segments [Member] | Research Publishing & Platforms [Member]      
Segment Information [Abstract]      
Total assets 1,225,313 1,172,145 1,242,458
Operating Segments [Member] | Academic & Professional Learning [Member]      
Segment Information [Abstract]      
Total assets 924,924 959,601 942,598
Operating Segments [Member] | Education Services [Member]      
Segment Information [Abstract]      
Total assets 486,316 440,516 199,023
Corporate [Member]      
Segment Information [Abstract]      
Total assets $ 532,241 $ 376,504 $ 455,372