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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($) $ in Thousands		Jan. 31, 2020	Apr. 30, 2019
Intangible Assets with Determinable Lives, net [Abstract]
Total		$ 707,711	$ 648,440
Intangible Assets with Indefinite Lives [Abstract]
Total		218,223	217,132
Intangible assets (excluding goodwill) [Abstract]
Total Intangible Assets, Net		925,934	865,572
Brands and Trademarks [Member]
Intangible Assets with Indefinite Lives [Abstract]
Total		132,701	130,909
Content and Publishing Rights [Member]
Intangible Assets with Indefinite Lives [Abstract]
Total		85,522	86,223
Content and Publishing Rights [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total	[1]	383,874	389,172
Customer Relationships [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total	[1]	286,034	245,830
Brands and Trademarks [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total	[1]	20,361	12,993
Covenants Not to Compete [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total		296	445
Developed Technology [Member]
Intangible Assets with Determinable Lives, net [Abstract]
Total	[1]	$ 17,146	$ 0
[1] Refer to Note 3, “Acquisitions,” for more information related to the acquisitions that occurred in the nine months ended January 31, 2020.

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- Definition

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

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

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