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Segment Information, Other Significant Reconciling Items by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for long lived assets	$ (150,728)	$ (303,427)	$ (151,395)
Depreciation and amortization	153,989	156,561	155,849
Operating Segments [Member] | Research [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for long lived assets	(7,538)	(154,189)	(20,418)
Depreciation and amortization	33,655	29,330	26,410
Operating Segments [Member] | Publishing [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for long lived assets	(23,666)	(29,420)	(35,966)
Depreciation and amortization	39,495	43,831	47,108
Operating Segments [Member] | Solutions [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for long lived assets	(16,786)	(21,210)	(23,344)
Depreciation and amortization	27,703	26,792	22,927
Corporate [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Expenditures for long lived assets	(102,738)	(98,608)	(71,667)
Depreciation and amortization	$ 53,136	$ 56,608	$ 59,404

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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X

- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585

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- Definition

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.

+ References

No definition available.

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