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Goodwill and Intangible Assets, Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2018
Apr. 30, 2020
Apr. 30, 2019
Identifiable intangible assets acquired and weighted-average useful life [Abstract]      
Cost [1]   $ 1,248,291 $ 1,152,088
Accumulated amortization [1]   (559,381) (503,648)
Accumulated Impairment [1]   (2,841) 0
Total [1]   686,069 648,440
Intangible assets with indefinite lives [Abstract]      
Cost   214,443 220,732
Accumulated impairment   (93,107) (3,600)
Total   121,336 217,132
Intangible assets (excluding goodwill) [Abstract]      
Cost   1,462,734 1,372,820
Accumulated impairment   (95,948) (3,600)
Total Intangible Assets, Net   807,405 865,572
Impairment of goodwill and intangible assets   110,000  
Estimated future amortization expense related to intangible assets [Abstract]      
2021   65,570  
2022   59,748  
2023   53,796  
2024   50,554  
2025   46,364  
Thereafter   410,037  
Total [1]   686,069 648,440
Brands and Trademarks [Member]      
Intangible assets with indefinite lives [Abstract]      
Cost   130,107 134,509
Accumulated impairment   (93,107) (3,600)
Total   37,000 130,909
Content and Publishing Rights [Member]      
Intangible assets with indefinite lives [Abstract]      
Cost   84,336 86,223
Accumulated impairment   0 0
Total   84,336 86,223
Brands [Member]      
Intangible assets (excluding goodwill) [Abstract]      
Impairment charges (BW in FY20) $ 3,600 89,500  
Fair value of intangible assets (BW in FY20) $ 1,200    
Developed Technology Rights [Member]      
Intangible assets (excluding goodwill) [Abstract]      
Impairment charges (BW in FY20)   2,800  
Content and Publishing Rights [Member]      
Identifiable intangible assets acquired and weighted-average useful life [Abstract]      
Cost   806,862 806,628
Accumulated amortization   (444,756) (417,456)
Accumulated Impairment   0 0
Total   362,106 389,172
Estimated future amortization expense related to intangible assets [Abstract]      
Total   362,106 389,172
Customer Relationships [Member]      
Identifiable intangible assets acquired and weighted-average useful life [Abstract]      
Cost   377,652 310,977
Accumulated amortization   (87,234) (65,147)
Accumulated Impairment   0 0
Total   290,418 245,830
Estimated future amortization expense related to intangible assets [Abstract]      
Total   290,418 245,830
Developed Technology Rights [Member]      
Identifiable intangible assets acquired and weighted-average useful life [Abstract]      
Cost   19,225 0
Accumulated amortization   (3,273) 0
Accumulated Impairment   (2,841) 0
Total   13,111 0
Estimated future amortization expense related to intangible assets [Abstract]      
Total   13,111 0
Brands and Trademarks [Member]      
Identifiable intangible assets acquired and weighted-average useful life [Abstract]      
Cost   42,877 32,802
Accumulated amortization   (22,689) (19,809)
Accumulated Impairment   0 0
Total   20,188 12,993
Estimated future amortization expense related to intangible assets [Abstract]      
Total   20,188 12,993
Covenants Not to Compete [Member]      
Identifiable intangible assets acquired and weighted-average useful life [Abstract]      
Cost   1,675 1,681
Accumulated amortization   (1,429) (1,236)
Accumulated Impairment   0 0
Total   246 445
Estimated future amortization expense related to intangible assets [Abstract]      
Total   $ 246 $ 445
Brands [Member]      
Identifiable intangible assets acquired and weighted-average useful life [Abstract]      
Estimated useful life 5 years    
[1] Refer to Note 4, “Acquisitions,” in the Notes to Consolidated Financial Statements for more information related to the acquisitions that occurred in the year ended April 30, 2020.