Fair Value Of Financial Instruments (Schedule Of Contingent Consideration Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year	$ 6,965
Increase in Fair Value	1,014	$ (1,936)	$ 1,538
Payments	(3,431)
Contingent consideration liability at end of year	4,548	6,965
Robert Gregory Partners [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year	913
Increase in Fair Value	693
Payments	(1,000)
Contingent consideration liability at end of year	606	913
Jhana Education [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year	6,052
Increase in Fair Value	321
Payments	(2,431)
Contingent consideration liability at end of year	$ 3,942	$ 6,052