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Segment Information, Total Assets by Segment (Details) - USD ($) $ in Thousands	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 2,606,217	$ 2,921,096	$ 3,004,243
Operating Segments [Member] | Research [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	1,133,846	1,235,609	1,237,969
Operating Segments [Member] | Publishing [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	582,339	672,987	652,923
Operating Segments [Member] | Solutions [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	575,068	439,554	459,260
Corporate/Shared Services [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 314,964	$ 572,946	$ 654,091

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://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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

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- Definition

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+ References

No definition available.

+ Details

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