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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jul. 31, 2017	Jan. 31, 2019		Jan. 31, 2018	Apr. 30, 2018
Intangible Assets with Determinable Lives, net [Abstract]
Total		$ 671,441			$ 615,244
Intangible Assets with Indefinite Lives [Abstract]
Total		221,162			232,827
Intangible assets (excluding goodwill) [Abstract]
Total Intangible Assets, Net		892,603			848,071
Impairment charges		0		$ 3,600
Brands and Trademarks [Member]
Intangible Assets with Indefinite Lives [Abstract]
Total		132,912			138,589
Content and Publishing Rights [Member]
Intangible Assets with Indefinite Lives [Abstract]
Total		88,250			94,238
Brands [Member]
Intangible assets (excluding goodwill) [Abstract]
Impairment charges	$ 3,600
Fair value of intangible assets	$ 1,200
Content and Publishing Rights [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total		405,426	[1]		436,760
Customer Relationships [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total		251,855	[1]		161,729
Brands and Trademarks [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total		13,663			16,100
Covenants Not to Compete [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total		$ 497			$ 655
[1] As of January 31, 2019, amounts include intangible assets acquired as part of the acquisition of Learning House on November 1, 2018. Refer to Note 3, "Acquisition," in the Notes to Unaudited Condensed Consolidated Financial Statements for more information related to the acquisition of Learning House.

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