Intangible Assets And Goodwill (Intangible Assets) (Details) - USD ($) $ in Thousands	Aug. 31, 2020	Aug. 31, 2019
Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, gross carrying amount	$ 121,107	$ 117,034
Finite-lived intangible assets, accumulated amortization	(96,982)	(92,344)
Finite-lived intangible assets, net carrying amount	24,125	24,690
Intangible assets, gross carrying amount	144,107	140,034
Intangible assets, accumulated amortization	(96,982)	(92,344)
Intangible assets, net carrying amount	47,125	47,690
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
Acquired Content [Member]
Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, gross carrying amount	62,327	62,307
Finite-lived intangible assets, accumulated amortization	(50,749)	(48,449)
Finite-lived intangible assets, net carrying amount	11,578	13,858
License Rights [Member]
Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, gross carrying amount	32,137	28,099
Finite-lived intangible assets, accumulated amortization	(21,321)	(20,063)
Finite-lived intangible assets, net carrying amount	10,816	8,036
Customer Lists [Member]
Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, gross carrying amount	20,280	20,266
Finite-lived intangible assets, accumulated amortization	(18,926)	(18,450)
Finite-lived intangible assets, net carrying amount	1,354	1,816
Acquired Technology [Member]
Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, gross carrying amount	3,568	3,568
Finite-lived intangible assets, accumulated amortization	(3,568)	(3,149)
Finite-lived intangible assets, net carrying amount		419
Trade Names [Member]
Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, gross carrying amount	2,036	2,036
Finite-lived intangible assets, accumulated amortization	(1,759)	(1,602)
Finite-lived intangible assets, net carrying amount	277	434
Non-Compete Agreements And Other [Member]
Intangible Assets And Goodwill [Line Items]
Finite-lived intangible assets, gross carrying amount	759	758
Finite-lived intangible assets, accumulated amortization	(659)	(631)
Finite-lived intangible assets, net carrying amount	$ 100	$ 127