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Segment Information, Other Significant Reconciling Items by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | $ (101,593) | $ (150,728) | $ (303,427)
Depreciation and amortization | 161,155 | 153,989 | 156,561
Operating Segments [Member] | Research [Member] |  |  |
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | (6,457) | (7,538) | (154,189)
Depreciation and amortization | 37,088 | 33,655 | 29,330
Operating Segments [Member] | Publishing [Member] |  |  |
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | (19,712) | (23,666) | (29,420)
Depreciation and amortization | 33,892 | 39,495 | 43,831
Operating Segments [Member] | Solutions [Member] |  |  |
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | (9,001) | (16,786) | (21,210)
Depreciation and amortization | 34,300 | 27,703 | 26,792
Corporate [Member] |  |  |
Segment Information [Abstract] |  |  |
Expenditures for long lived assets | (66,423) | (102,738) | (98,608)
Depreciation and amortization | $ 55,875 | $ 53,136 | $ 56,608

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