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v3.8.0.1

Segment Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2017 USD ($) | Oct. 31, 2016 USD ($) | Oct. 31, 2017 USD ($) Segment | Oct. 31, 2016 USD ($)
Segment Information [Abstract] |  |  |  |
Number of reportable segments | Segment |  |  | 3 |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 451,731 | $ 425,588 | $ 863,175 | $ 829,873
Contribution to profit (loss) | 120,948 | 102,141 | 185,450 | 182,065
Operating and administrative expenses | (239,318) | (247,270) | (483,126) | (482,497)
Operating income | 82,771 | 47,644 | 97,271 | 91,571
Operating Segments [Member] | Research [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 228,870 | 205,994 | 452,497 | 413,218
Contribution to profit (loss) | 71,163 | 60,292 | 132,624 | 120,727
Operating Segments [Member] | Publishing [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 164,985 | 163,300 | 296,263 | 308,261
Contribution to profit (loss) | 42,476 | 36,490 | 47,485 | 55,832
Operating Segments [Member] | Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 57,876 | 56,294 | 114,415 | 108,394
Contribution to profit (loss) | 7,309 | 5,359 | 5,341 | 5,506
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating and administrative expenses | $ (38,177) | $ (54,497) | $ (88,179) | $ (90,494)

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