Nature Of Operations And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018	Sep. 01, 2019	Sep. 01, 2018	Aug. 31, 2017
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 27,137	$ 27,699	$ 10,153			$ 8,924
Capitalized interest expense			100
Capitalized curriculum development spending	5,100
Capitalized development costs	8,100	7,000
Foreign currency transaction gains (losses)	(100)	(200)	(500)
Advertising costs	3,300	4,600	$ 6,900
Restructuring charges	1,636
Remaining accrued restructuring costs	$ 1,200
Percent likelihood of being realized upon ultimate settlement	50.00%
Operating lease, liabilities	$ 1,203
Operating lease, ROU asset	1,203
Retained Earnings [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cumulative effect of new accounting standard		$ 3,143
Held Outside The US By Foreign Subsidiaries [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	12,200
ASU 2016-02 [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Operating lease, liabilities				$ 1,500
Operating lease, ROU asset				$ 1,500
ASU 2014-09 [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cumulative effect of new accounting standard					$ 4,100
ASU 2014-09 [Member] | Retained Earnings [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Cumulative effect of new accounting standard					$ 3,100
Covey Trade Name [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Goodwill, impairment loss	$ 0
Minimum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Capitalized development costs, amortization period	3 years
Maximum [Member]
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Capitalized development costs, amortization period	5 years