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Intangible Assets And Goodwill (Intangible Assets) (Details) - USD ($)
$ in Thousands
Aug. 31, 2017
Aug. 31, 2016
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount $ 116,298 $ 105,690
Definite-lived intangible assets, accumulated amortization (82,004) (78,494)
Finite-lived intangible assets, net carrying amount 34,294 27,196
Intangible assets, gross carrying amount 139,298 128,690
Intangible assets, accumulated amortization (82,004) (78,494)
Intangible assets, net carrying amount 57,294 50,196
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 27,750 27,000
Definite-lived intangible assets, accumulated amortization (17,802) (16,790)
Finite-lived intangible assets, net carrying amount 9,948 10,210
Acquired Content [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 62,094 58,564
Definite-lived intangible assets, accumulated amortization (43,864) (42,175)
Finite-lived intangible assets, net carrying amount 18,230 16,389
Customer Lists [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 20,092 16,827
Definite-lived intangible assets, accumulated amortization (16,935) (16,529)
Finite-lived intangible assets, net carrying amount 3,157 298
Acquired Technology [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 3,568 2,049
Definite-lived intangible assets, accumulated amortization (2,136) (2,049)
Finite-lived intangible assets, net carrying amount 1,432  
Tradename [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 2,036 1,250
Definite-lived intangible assets, accumulated amortization (1,163) (951)
Finite-lived intangible assets, net carrying amount 873 $ 299
Non-Compete Agreements And Other [Member]    
Intangible Assets And Goodwill [Line Items]    
Definite-lived intangible assets, gross carrying amount 758  
Definite-lived intangible assets, accumulated amortization (104)  
Finite-lived intangible assets, net carrying amount $ 654