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Goodwill and Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Oct. 31, 2018	Apr. 30, 2018
Goodwill [Roll Forward]
Beginning balance	$ 1,019,801
Foreign translation adjustment	(33,553)
Ending balance	986,248	$ 1,019,801
Research [Member]
Goodwill [Roll Forward]
Beginning balance	463,419
Foreign translation adjustment	(25,832)
Ending balance	437,587	463,419
Publishing [Member]
Goodwill [Roll Forward]
Beginning balance	283,851
Foreign translation adjustment	(726)	(11,600)
Ending balance	283,125	283,851
Solutions [Member]
Goodwill [Roll Forward]
Beginning balance	272,531
Foreign translation adjustment	(6,995)	11,600
Ending balance	$ 265,536	$ 272,531

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://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&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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