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Segment Information, Other Significant Reconciling Items by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Segment Information [Abstract]
Expenditures for long lived assets	$ (101,593)	$ (150,728)	$ (303,427)
Depreciation and amortization	161,155	153,989	156,561
Operating Segments [Member] | Research [Member]
Segment Information [Abstract]
Expenditures for long lived assets	(6,457)	(7,538)	(154,189)
Depreciation and amortization	37,088	33,655	29,330
Operating Segments [Member] | Publishing [Member]
Segment Information [Abstract]
Expenditures for long lived assets	(19,712)	(23,666)	(29,420)
Depreciation and amortization	33,892	39,495	43,831
Operating Segments [Member] | Solutions [Member]
Segment Information [Abstract]
Expenditures for long lived assets	(9,001)	(16,786)	(21,210)
Depreciation and amortization	34,300	27,703	26,792
Corporate [Member]
Segment Information [Abstract]
Expenditures for long lived assets	(66,423)	(102,738)	(98,608)
Depreciation and amortization	$ 55,875	$ 53,136	$ 56,608

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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X

- References

No definition available.

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