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v3.8.0.1

Segment Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Oct. 31, 2017 USD ($) | Jul. 31, 2017 USD ($) | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) | Apr. 30, 2018 USD ($) Segment | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Segment Information [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  |  | 3 |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 477,300 | $ 455,700 | $ 451,700 | $ 411,400 | $ 452,200 | $ 436,400 | $ 425,600 | $ 404,300 | $ 1,796,103 | $ 1,718,530 | $ 1,727,037
Corporate Expenses |  |  |  |  |  |  |  |  | (181,961) | (186,600) | (194,047)
Operating Income | $ 74,800 | $ 67,400 | $ 82,800 | $ 14,500 | $ 63,500 | $ 51,200 | $ 47,700 | $ 43,800 | 239,535 | 206,153 | 188,113
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,796,103 | 1,718,530 | 1,727,037
Contribution to Profit |  |  |  |  |  |  |  |  | 421,496 | 392,753 | 382,160
Operating Segments [Member] | Research [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 934,395 | 853,489 | 826,778
Contribution to Profit |  |  |  |  |  |  |  |  | 275,480 | 252,228 | 252,110
Operating Segments [Member] | Publishing [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 617,648 | 633,449 | 695,728
Contribution to Profit |  |  |  |  |  |  |  |  | 123,917 | 125,703 | 126,058
Operating Segments [Member] | Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 244,060 | 231,592 | 204,531
Contribution to Profit |  |  |  |  |  |  |  |  | $ 22,099 | $ 14,822 | $ 3,992

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