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Goodwill and Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Oct. 31, 2017 | Oct. 31, 2016
Goodwill [Roll Forward] |  |
Beginning balance | $ 982,101 | $ 951,663
Acquisitions |  | 78,224
Foreign translation adjustment | 17,445 | (55,819)
Ending balance | 999,546 | 974,068
Research [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 437,928 | 406,395
Acquisitions |  | 74,119
Foreign translation adjustment | 9,569 | (51,110)
Ending balance | 447,497 | 429,404
Publishing [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 283,192 | 284,217
Acquisitions |  | 0
Foreign translation adjustment | 7,876 | (4,709)
Ending balance | 291,068 | 279,508
Solutions [Member] |  |
Goodwill [Roll Forward] |  |
Beginning balance | 260,981 | 261,051
Acquisitions |  | 4,105
Foreign translation adjustment | 0 | 0
Ending balance | $ 260,981 | $ 265,156

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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