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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2017
Apr. 30, 2017
Jul. 31, 2016
Indefinite-lived Intangible Assets [Line Items]      
Intangible assets with indefinite lives $ 222,155 $ 219,234 $ 222,315
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 611,521 608,865 608,934
Total 833,676 828,099 831,249
Brands and Trademarks [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Intangible assets with indefinite lives 132,042 135,061 137,339
Content and Publishing Rights [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Intangible assets with indefinite lives 90,113 84,173 84,976
Content and Publishing Rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 424,105 421,597 429,826
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 168,639 169,116 164,900
Brands and Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 17,923 17,195 13,679
Covenants Not to Compete [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 854 $ 957 $ 529
Brands [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 1,200    
Impairment of intangible assets $ 3,600    
Estimated useful life 5 years