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Segment Information, Other Significant Reconciling Items by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | $ (103,361) | $ (115,201) | $ (101,593)
Operating Segments [Member] | Research Publishing & Platforms [Member] |  |  |
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | (24,284) | (16,329) | (12,928)
Operating Segments [Member] | Academic & Professional Learning [Member] |  |  |
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | (41,897) | (38,229) | (32,337)
Operating Segments [Member] | Education Services [Member] |  |  |
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | (3,449) | (613) | (3,160)
Corporate [Member] |  |  |
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | $ (33,731) | $ (60,030) | $ (53,168)

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