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Goodwill and Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Jan. 31, 2019	Apr. 30, 2018
Goodwill [Roll Forward]
Beginning balance		$ 1,019,801
Acquisition	[1]	109,139
Foreign translation adjustment		(25,718)
Ending balance		1,103,222	$ 1,019,801
Research [Member]
Goodwill [Roll Forward]
Beginning balance		463,419
Acquisition	[1]	0
Foreign translation adjustment		(18,338)
Ending balance		445,081	463,419
Publishing [Member]
Goodwill [Roll Forward]
Beginning balance		283,851
Acquisition	[1]	0
Foreign translation adjustment		(518)	(11,600)
Ending balance		283,333	283,851
Solutions [Member]
Goodwill [Roll Forward]
Beginning balance		272,531
Acquisition	[1]	109,139
Foreign translation adjustment		(6,862)	11,600
Ending balance		$ 374,808	$ 272,531
[1] Refer to Note 3, "Acquisition," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information related to the acquisition of Learning House on November 1, 2018.

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

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-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 45
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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.

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