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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Apr. 30, 2018
Intangible Assets with Determinable Lives, net [Abstract]      
Total $ 587,959   $ 615,244
Intangible Assets with Indefinite Lives [Abstract]      
Total 223,199   232,827
Intangible assets (excluding goodwill) [Abstract]      
Total Intangible Assets, Net 811,158   848,071
Impairment charges 0 $ 3,600  
Brands and Trademarks [Member]      
Intangible Assets with Indefinite Lives [Abstract]      
Total 132,832   138,589
Content and Publishing Rights [Member]      
Intangible Assets with Indefinite Lives [Abstract]      
Total 90,367   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 415,482   436,760
Customer Relationships [Member]      
Intangible Assets with Determinable Lives, net [Abstract]      
Total 157,196   161,729
Brands and Trademarks [Member]      
Intangible Assets with Determinable Lives, net [Abstract]      
Total 14,679   16,100
Covenants Not to Compete [Member]      
Intangible Assets with Determinable Lives, net [Abstract]      
Total $ 602   $ 655
Brands [Member]      
Intangible Assets with Determinable Lives, net [Abstract]      
Estimated useful life 5 years