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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Thousands
Apr. 30, 2017
Apr. 30, 2016
Intangible assets with determinable lives [Abstract]    
Cost $ 1,047,323 $ 1,046,697
Accumulated amortization (438,458) (404,575)
Intangible assets (excluding goodwill) [Abstract]    
Cost 1,266,557 1,281,582
Accumulated amortization (438,458) (404,575)
Estimated future amortization expense related to intangible assets [Abstract]    
2018 47,200  
2019 45,600  
2020 41,100  
2021 38,400  
2022 33,900  
Brands and Trademarks [Member]    
Intangible assets with indefinite lives [Abstract]    
Cost 135,061 147,683
Content and Publishing Rights [Member]    
Intangible assets with indefinite lives [Abstract]    
Cost 84,173 87,202
Content and Publishing Rights [Member]    
Intangible assets with determinable lives [Abstract]    
Cost 775,520 790,055
Accumulated amortization (353,923) (333,174)
Intangible assets (excluding goodwill) [Abstract]    
Accumulated amortization (353,923) (333,174)
Customer Relationships [Member]    
Intangible assets with determinable lives [Abstract]    
Cost 233,872 224,839
Accumulated amortization (64,756) (54,677)
Intangible assets (excluding goodwill) [Abstract]    
Accumulated amortization (64,756) (54,677)
Brands and Trademarks [Member]    
Intangible assets with determinable lives [Abstract]    
Cost 35,554 30,116
Accumulated amortization (18,359) (15,713)
Intangible assets (excluding goodwill) [Abstract]    
Accumulated amortization (18,359) (15,713)
Covenants Not to Compete [Member]    
Intangible assets with determinable lives [Abstract]    
Cost 2,377 1,687
Accumulated amortization (1,420) (1,011)
Intangible assets (excluding goodwill) [Abstract]    
Accumulated amortization $ (1,420) $ (1,011)