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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 31, 2017
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Finite-lived intangible assets [Abstract]        
Cost   $ 1,152,088 $ 1,069,776  
Accumulated amortization   (503,648) (454,532)  
Total   648,440 615,244  
Intangible assets with indefinite lives [Abstract]        
Cost   220,732 236,427  
Accumulated impairment   (3,600) (3,600)  
Total   217,132 232,827  
Intangible assets (excluding goodwill) [Abstract]        
Cost   1,372,820 1,306,203  
Total Intangible Assets, Net   865,572 848,071  
Impairment charges   0 3,600 $ 0
Estimated future amortization expense related to intangible assets [Abstract]        
2020   50,419    
2021   48,517    
2022   44,115    
2023   40,305    
2024   37,929    
Thereafter   427,155    
Total   648,440 615,244  
Brands and Trademarks [Member]        
Intangible assets with indefinite lives [Abstract]        
Cost   134,509 142,189  
Accumulated impairment   (3,600) (3,600)  
Total   $ 130,909 138,589  
Trademarks [Member]        
Intangible assets (excluding goodwill) [Abstract]        
% by which estimated fair value exceeds carrying value   7.00%    
Content and Publishing Rights [Member]        
Intangible assets with indefinite lives [Abstract]        
Cost   $ 86,223 94,238  
Accumulated impairment   0 0  
Total   86,223 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]        
Finite-lived intangible assets [Abstract]        
Cost   806,628 824,146  
Accumulated amortization   (417,456) (387,386)  
Total   389,172 436,760  
Estimated future amortization expense related to intangible assets [Abstract]        
Total   389,172 436,760  
Customer Relationships [Member]        
Finite-lived intangible assets [Abstract]        
Cost   310,977 212,020  
Accumulated amortization   (65,147) (50,291)  
Total   245,830 161,729  
Estimated future amortization expense related to intangible assets [Abstract]        
Total   245,830 161,729  
Brands and Trademarks [Member]        
Finite-lived intangible assets [Abstract]        
Cost   32,802 32,111  
Accumulated amortization   (19,809) (16,011)  
Total   12,993 16,100  
Estimated future amortization expense related to intangible assets [Abstract]        
Total   12,993 16,100  
Covenants Not to Compete [Member]        
Finite-lived intangible assets [Abstract]        
Cost   1,681 1,499  
Accumulated amortization   (1,236) (844)  
Total   445 655  
Estimated future amortization expense related to intangible assets [Abstract]        
Total   $ 445 $ 655  
Brands [Member]        
Finite-lived intangible assets [Abstract]        
Estimated useful life   5 years