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Segment Information, Total Assets by Segment (Details) - USD ($) $ in Thousands	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Segment Information [Abstract]
Total assets	$ 2,937,002	$ 2,839,451	$ 2,606,217
Operating Segments [Member] | Research [Member]
Segment Information [Abstract]
Total assets	1,152,973	1,238,178	1,133,846
Operating Segments [Member] | Publishing [Member]
Segment Information [Abstract]
Total assets	643,549	575,033	582,339
Operating Segments [Member] | Solutions [Member]
Segment Information [Abstract]
Total assets	751,854	563,489	575,068
Corporate [Member]
Segment Information [Abstract]
Total assets	$ 388,626	$ 462,751	$ 314,964

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-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 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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- References

No definition available.

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