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Intangible Assets And Goodwill (Intangible Assets) (Details) - USD ($)
$ in Thousands
Aug. 31, 2021
Aug. 31, 2020
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount $ 108,399 $ 121,107
Definite-lived intangible assets, accumulated amortization (81,302) (96,982)
Finite-lived intangible assets, net carrying amount 27,097 24,125
Intangible assets, gross carrying amount 131,399 144,107
Intangible assets, accumulated amortization (81,302) (96,982)
Intangible assets, net carrying amount 50,097 47,125
Covey Trade Name [Member]    
Intangible Assets And Goodwill [Line Items]    
Indefinite-lived intangible asset, gross carrying amount 23,000 23,000
Intangible assets, net carrying amount 23,000 23,000
License Rights [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 32,133 32,137
Definite-lived intangible assets, accumulated amortization (23,036) (21,321)
Finite-lived intangible assets, net carrying amount 9,097 10,816
Acquired Content [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 50,003 62,327
Definite-lived intangible assets, accumulated amortization (40,352) (50,749)
Finite-lived intangible assets, net carrying amount 9,651 11,578
Customer Lists [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 16,168 20,280
Definite-lived intangible assets, accumulated amortization (14,519) (18,926)
Finite-lived intangible assets, net carrying amount 1,649 1,354
Acquired Technology [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 7,282 3,568
Definite-lived intangible assets, accumulated amortization (1,759) (3,568)
Finite-lived intangible assets, net carrying amount 5,523  
Tradename [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 1,883 2,036
Definite-lived intangible assets, accumulated amortization (933) (1,759)
Finite-lived intangible assets, net carrying amount 950 277
Non-Compete Agreements And Other [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 930 759
Definite-lived intangible assets, accumulated amortization (703) (659)
Finite-lived intangible assets, net carrying amount $ 227 $ 100