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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2018 | Oct. 31, 2017 | Oct. 31, 2018 | Oct. 31, 2017
Segment information [Abstract] |  |  |  |  |  |
Revenue | $ 448,622 | $ 451,731 |  | $ 859,523 | $ 863,175 |
Contribution to Profit | 105,411 | 119,368 | [1] | 179,481 | 182,332 | [1]
Corporate Expenses | (47,936) | (38,580) |  | (85,866) | (88,974) |
Operating Income | 57,475 | 80,788 | [1] | 93,615 | 93,358 | [1]
Net benefits | (1,872) | (1,683) |  | (3,919) | (3,382) |
Operating and Administrative Expenses [Member] | ASU 2017-07 Member] |  |  |  |  |  |
Segment information [Abstract] |  |  |  |  |  |
Net benefits |  | 2,000 |  |  | 3,900 |
Interest and Other Income [Member] | ASU 2017-07 Member] |  |  |  |  |  |
Segment information [Abstract] |  |  |  |  |  |
Net benefits | (2,100) | (2,000) |  | (4,500) | (3,900) |
Research [Member] | Interest and Other Income [Member] | ASU 2017-07 Member] |  |  |  |  |  |
Segment information [Abstract] |  |  |  |  |  |
Net benefits |  | (1,000) |  |  | (2,000) |
Publishing [Member] | Interest and Other Income [Member] | ASU 2017-07 Member] |  |  |  |  |  |
Segment information [Abstract] |  |  |  |  |  |
Net benefits |  | (600) |  |  | (1,100) |
Operating Segments [Member] | Research [Member] |  |  |  |  |  |
Segment information [Abstract] |  |  |  |  |  |
Revenue | 228,645 | 228,870 |  | 453,637 | 452,497 |
Contribution to Profit | 58,907 | 70,146 |  | 116,033 | 130,608 |
Operating Segments [Member] | Publishing [Member] |  |  |  |  |  |
Segment information [Abstract] |  |  |  |  |  |
Revenue | 157,499 | 164,985 |  | 282,420 | 296,263 |
Contribution to Profit | 39,455 | 41,913 |  | 53,175 | 46,383 |
Operating Segments [Member] | Solutions [Member] |  |  |  |  |  |
Segment information [Abstract] |  |  |  |  |  |
Revenue | 62,478 | 57,876 |  | 123,466 | 114,415 |
Contribution to Profit | $ 7,049 | 7,309 |  | $ 10,273 | 5,341 |
Corporate [Member] | Interest and Other Income [Member] | ASU 2017-07 Member] |  |  |  |  |  |
Segment information [Abstract] |  |  |  |  |  |
Net benefits |  | $ (400) |  |  | $ (800) |
[1] | Due to the retrospective adoption of ASU 2017-07, total net benefits of $2.0 million and $3.9 million related to the non-service components of defined benefit and other post-employment benefit plans were reclassified from Operating and Administrative Expenses to Interest Income and Other for the three and six months ended October 31, 2017, respectively. Refer to Note 2, "Recent Accounting Standards," in the Notes to Condensed Consolidated Financial Statements for more information. The impact of the reclassification on Contribution to Profit by segment for the three months ended October 31, 2017 was $1.0 million in Research, $0.6 million in Publishing, and $0.4 million in Corporate expenses. The impact of the reclassification on Contribution to Profit by segment for the six months ended October 31, 2017 was $2.0 million in Research, $1.1 million in Publishing, and $0.8 million in Corporate expenses.

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