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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Apr. 30, 2018
Intangible Assets with Determinable Lives, net [Abstract]
Total		$ 569,034		$ 615,244
Intangible Assets with Indefinite Lives [Abstract]
Total		218,595		232,827
Intangible assets (excluding goodwill) [Abstract]
Total Intangible Assets, Net		787,629		848,071
Impairment charges		0	$ 3,600
Brands and Trademarks [Member]
Intangible Assets with Indefinite Lives [Abstract]
Total		130,460		138,589
Content and Publishing Rights [Member]
Intangible Assets with Indefinite Lives [Abstract]
Total		88,135		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		401,341		436,760
Customer Relationships [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total		152,803		161,729
Brands and Trademarks [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total		14,340		16,100
Covenants Not to Compete [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total		$ 550		$ 655

X

- Definition

Amount of assets, net of accumulated impairment, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
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Fair value portion of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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