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Segment Information (Tables) | 6 Months Ended
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Oct. 31, 2018
Segment Information [Abstract] |
Segment Information | Segment information is as follows:
|  | Three Months Ended October 31, |  |  | Six Months Ended October 31, |
|  | 2018 |  |  | 2017 (1) |  |  | 2018 |  |  | 2017 (1) |
Revenue: |  |  |  |  |  |  |  |  |  |  |  |
Research |  | $ | 228,645 |  |  | $ | 228,870 |  |  | $ | 453,637 |  |  | $ | 452,497 |
Publishing |  |  | 157,499 |  |  |  | 164,985 |  |  |  | 282,420 |  |  |  | 296,263 |
Solutions |  |  | 62,478 |  |  |  | 57,876 |  |  |  | 123,466 |  |  |  | 114,415 |
Total Revenue |  | $ | 448,622 |  |  | $ | 451,731 |  |  | $ | 859,523 |  |  | $ | 863,175 |
Contribution to Profit: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research |  | $ | 58,907 |  |  | $ | 70,146 |  |  | $ | 116,033 |  |  | $ | 130,608 |
Publishing |  |  | 39,455 |  |  |  | 41,913 |  |  |  | 53,175 |  |  |  | 46,383 |
Solutions |  |  | 7,049 |  |  |  | 7,309 |  |  |  | 10,273 |  |  |  | 5,341 |
Total Contribution to Profit (1) |  | $ | 105,411 |  |  | $ | 119,368 |  |  | $ | 179,481 |  |  | $ | 182,332 |
Corporate Expenses |  |  | (47,936 | ) |  |  | (38,580 | ) |  |  | (85,866 | ) |  |  | (88,974 | )
Operating Income (1) |  | $ | 57,475 |  |  | $ | 80,788 |  |  | $ | 93,615 |  |  | $ | 93,358 |
(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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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8721-108599 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8906-108599 + Details
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