Intangible Assets And Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	Aug. 31, 2018	Aug. 31, 2017
Intangible Assets And Goodwill [Line Items]
Definite-lived intangible assets, gross carrying amount	$ 116,306	$ 116,298
Definite-lived intangible assets, accumulated amortization	(87,372)	(82,004)
Finite-lived intangible assets, net carrying amount	28,934	34,294
Intangible assets, gross carrying amount	139,306	139,298
Intangible assets, accumulated amortization	(87,372)	(82,004)
Intangible assets, net carrying amount	51,934	57,294
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	27,750
Definite-lived intangible assets, accumulated amortization	(18,889)	(17,802)
Finite-lived intangible assets, net carrying amount	8,861	9,948
Acquired Content [Member]
Intangible Assets And Goodwill [Line Items]
Definite-lived intangible assets, gross carrying amount	62,102	62,094
Definite-lived intangible assets, accumulated amortization	(46,147)	(43,864)
Finite-lived intangible assets, net carrying amount	15,955	18,230
Customer Lists [Member]
Intangible Assets And Goodwill [Line Items]
Definite-lived intangible assets, gross carrying amount	20,092	20,092
Definite-lived intangible assets, accumulated amortization	(17,835)	(16,935)
Finite-lived intangible assets, net carrying amount	2,257	3,157
Acquired Technology [Member]
Intangible Assets And Goodwill [Line Items]
Definite-lived intangible assets, gross carrying amount	3,568	3,568
Definite-lived intangible assets, accumulated amortization	(2,642)	(2,136)
Finite-lived intangible assets, net carrying amount	926	1,432
Trade Names [Member]
Intangible Assets And Goodwill [Line Items]
Definite-lived intangible assets, gross carrying amount	2,036	2,036
Definite-lived intangible assets, accumulated amortization	(1,441)	(1,163)
Finite-lived intangible assets, net carrying amount	595	873
Non-Compete Agreements And Other [Member]
Intangible Assets And Goodwill [Line Items]
Definite-lived intangible assets, gross carrying amount	758	758
Definite-lived intangible assets, accumulated amortization	(418)	(104)
Finite-lived intangible assets, net carrying amount	$ 340	$ 654