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Goodwill and Intangible Assets, Goodwill (Details) $ in Thousands	9 Months Ended
	Jan. 31, 2018 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 982,101
Foreign translation adjustment	46,294
Ending balance	1,028,395
Research [Member]
Goodwill [Roll Forward]
Beginning balance	437,928
Foreign translation adjustment	31,751
Ending balance	$ 469,679
% by which estimated fair value exceeds carrying value	504.90%
Publishing [Member]
Goodwill [Roll Forward]
Beginning balance	$ 283,192
Foreign translation adjustment	14,543
Ending balance	$ 297,735
% by which estimated fair value exceeds carrying value	151.30%
Solutions [Member]
Goodwill [Roll Forward]
Beginning balance	$ 260,981
Foreign translation adjustment	0
Ending balance	$ 260,981
% by which estimated fair value exceeds carrying value	34.00%

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

+ Details

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Period Type:	instant

X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Percentage of fair value of reporting unit in excess of carrying amount.

+ References

No definition available.

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