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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Revenue | $ 455,675 | $ 436,456 | $ 1,318,850 | $ 1,266,329
Contribution to profit (loss) | 114,174 | 94,906 | 299,624 | 276,971
Operating and administrative expenses | (248,746) | (247,278) | (731,872) | (729,775)
Operating income | 67,431 | 51,160 | 164,702 | 142,731
Operating Segments [Member] | Research [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 223,489 | 205,769 | 675,986 | 618,987
Contribution to profit (loss) | 59,299 | 52,508 | 191,923 | 173,235
Operating Segments [Member] | Publishing [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 170,244 | 171,440 | 466,507 | 479,701
Contribution to profit (loss) | 48,472 | 38,807 | 95,957 | 94,639
Operating Segments [Member] | Solutions [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenue | 61,942 | 59,247 | 176,357 | 167,641
Contribution to profit (loss) | 6,403 | 3,591 | 11,744 | 9,097
Corporate [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating and administrative expenses | $ (46,743) | $ (43,746) | $ (134,922) | $ (134,240)

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