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Segment Information (Details) $ in Thousands	3 Months Ended
	Jul. 31, 2017 USD ($) Segment	Jul. 31, 2016 USD ($)
Segment Information [Abstract]
Number of reportable segments | Segment	3
Segment Reporting Information [Line Items]
Revenue	$ 411,444	$ 404,285
Contribution to profit (loss)	64,502	79,901
Operating and administrative expenses	(243,808)	(235,340)
Operating income	14,500	43,814
Operating Segments [Member] | Research [Member]
Segment Reporting Information [Line Items]
Revenue	223,627	207,223
Contribution to profit (loss)	61,461	60,435
Operating Segments [Member] | Publishing [Member]
Segment Reporting Information [Line Items]
Revenue	131,278	144,962
Contribution to profit (loss)	5,009	19,320
Operating Segments [Member] | Solutions [Member]
Segment Reporting Information [Line Items]
Revenue	56,539	52,100
Contribution to profit (loss)	(1,968)	146
Corporate [Member]
Segment Reporting Information [Line Items]
Operating and administrative expenses	$ (50,002)	$ (36,087)

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Direct contribution to profit minus allocated shared services and administrative costs.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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