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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, 2017
Apr. 30, 2017
Oct. 31, 2016
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets with indefinite lives   $ 223,995 $ 219,234 $ 214,906
Finite-Lived Intangible Assets [Line Items]        
Net intangible assets with determinable lives   604,529 608,865 608,056
Total   828,524 828,099 822,962
Brands and Trademarks [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets with indefinite lives   133,180 135,061 130,632
Content and Publishing Rights [Member]        
Indefinite-lived Intangible Assets [Line Items]        
Intangible assets with indefinite lives   90,815 84,173 84,274
Content and Publishing Rights [Member]        
Finite-Lived Intangible Assets [Line Items]        
Net intangible assets with determinable lives   420,508 421,597 406,467
Customer Relationships [Member]        
Finite-Lived Intangible Assets [Line Items]        
Net intangible assets with determinable lives   166,006 169,116 182,584
Brands and Trademarks [Member]        
Finite-Lived Intangible Assets [Line Items]        
Net intangible assets with determinable lives   17,246 17,195 17,522
Covenants Not to Compete [Member]        
Finite-Lived Intangible Assets [Line Items]        
Net intangible assets with determinable lives   $ 769 $ 957 $ 1,483
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