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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 31, 2018
Jul. 31, 2017
Apr. 30, 2017
Indefinite-lived Intangible Assets [Line Items]      
Intangible assets with indefinite lives $ 236,209   $ 219,234
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 632,422   608,865
Total 868,631   828,099
Brands and Trademarks [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Intangible assets with indefinite lives 140,127   135,061
Content and Publishing Rights [Member]      
Indefinite-lived Intangible Assets [Line Items]      
Intangible assets with indefinite lives 96,082   84,173
Content and Publishing Rights [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 449,358   421,597
Customer Relationships [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 165,572   169,116
Brands and Trademarks [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives 16,784   17,195
Covenants Not to Compete [Member]      
Finite-Lived Intangible Assets [Line Items]      
Net intangible assets with determinable lives $ 708   $ 957
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