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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Segment Information [Abstract]        
Revenue $ 491,011 $ 466,205 $ 922,337 $ 889,735
Corporate Expenses (41,486) (37,533) (81,443) (86,332)
Operating Income 69,905 63,391 99,944 67,950
Adjusted Operating Income [1] 71,825 67,392 104,082 82,686
Depreciation and Amortization 48,430 42,638 97,937 84,857
Adjusted EBITDA [2] 120,255 110,030 202,019 167,543
Research Publishing & Platforms [Member]        
Segment Information [Abstract]        
Revenue 251,334 234,709 492,144 464,084
Academic & Professional Learning [Member]        
Segment Information [Abstract]        
Revenue 170,590 177,725 297,503 322,583
Education Services [Member]        
Segment Information [Abstract]        
Revenue 69,087 53,771 132,690 103,068
Operating Segments [Member]        
Segment Information [Abstract]        
Contribution to Profit 111,391 100,924 181,387 154,282
Adjusted Contribution to Profit [1] 112,778 101,975 182,749 162,847
Depreciation and Amortization 44,695 39,908 90,479 79,083
Adjusted EBITDA [2] 157,473 141,883 273,228 241,930
Operating Segments [Member] | Research Publishing & Platforms [Member]        
Segment Information [Abstract]        
Revenue 251,334 234,709 492,144 464,084
Contribution to Profit 74,088 63,291 143,906 118,937
Adjusted Contribution to Profit [1] 73,850 64,017 143,471 122,283
Depreciation and Amortization 19,765 17,037 39,466 34,190
Adjusted EBITDA [2] 93,615 81,054 182,937 156,473
Operating Segments [Member] | Academic & Professional Learning [Member]        
Segment Information [Abstract]        
Revenue 170,590 177,725 297,503 322,583
Contribution to Profit 29,878 35,050 29,498 39,961
Adjusted Contribution to Profit [1] 31,419 35,850 31,072 43,566
Depreciation and Amortization 17,720 17,349 36,524 33,873
Adjusted EBITDA [2] 49,139 53,199 67,596 77,439
Operating Segments [Member] | Education Services [Member]        
Segment Information [Abstract]        
Revenue 69,087 53,771 132,690 103,068
Contribution to Profit 7,425 2,583 7,983 (4,616)
Adjusted Contribution to Profit [1] 7,509 2,108 8,206 (3,002)
Depreciation and Amortization 7,210 5,522 14,489 11,020
Adjusted EBITDA [2] 14,719 7,630 22,695 8,018
Corporate [Member]        
Segment Information [Abstract]        
Adjusted Corporate Expenses [1] (40,953) (34,583) (78,667) (80,161)
Depreciation and Amortization 3,735 2,730 7,458 5,774
Adjusted EBITDA [2] $ (37,218) $ (31,853) $ (71,209) $ (74,387)
[1] Adjusted Contribution to Profit is calculated as Contribution to Profit adjusted for restructuring and related charges. See Note 9, “Restructuring and Related Charges” for these charges by segment.
[2] Adjusted EBITDA is calculated as Adjusted Contribution to Profit with depreciation and amortization added back.