Fair Value Of Financial Instruments (Schedule Of Contingent Consideration Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year	$ 5,229
Change in Fair Value	(49)	$ 1,334	$ 1,014
Payments	(1,297)
Contingent consideration liability at end of year	3,883	5,229
Robert Gregory Partners [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year	1,761
Change in Fair Value	(445)
Payments	(500)
Contingent consideration liability at end of year	816	1,761
Jhana Education [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year	3,468
Change in Fair Value	396
Payments	(797)
Contingent consideration liability at end of year	$ 3,067	$ 3,468