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Segment Information, Total Assets by Segment (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
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Segment Information [Abstract] |  |  |
Total assets | $ 2,937,002 | $ 2,839,451 | $ 2,606,217
Operating Segments [Member] | Research [Member] |  |  |
Segment Information [Abstract] |  |  |
Total assets | 1,152,973 | 1,238,178 | 1,133,846
Operating Segments [Member] | Publishing [Member] |  |  |
Segment Information [Abstract] |  |  |
Total assets | 643,549 | 575,033 | 582,339
Operating Segments [Member] | Solutions [Member] |  |  |
Segment Information [Abstract] |  |  |
Total assets | 751,854 | 563,489 | 575,068
Corporate [Member] |  |  |
Segment Information [Abstract] |  |  |
Total assets | $ 388,626 | $ 462,751 | $ 314,964

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