Fair Value Of Financial Instruments (Schedule Of Contingent Consideration Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017	Aug. 31, 2017
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year			$ 6,965
Increases in Fair Value	$ 477	$ (924)	652	$ (1,936)	$ 652
Payments/Decreases			(44)		(1,152)
Contingent consideration liability at end of quarter	6,465		6,465		6,965
Robert Gregory Partners, LLC [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year			913
Increases in Fair Value					424
Payments/Decreases
Contingent consideration liability at end of quarter	1,337		1,337		913
Jhana Education [Member]
Business Acquisition, Contingent Consideration [Line Items]
Contingent consideration liability at beginning of year			6,052
Increases in Fair Value					228
Payments/Decreases					(1,152)
Contingent consideration liability at end of quarter	$ 5,128		$ 5,128		$ 6,052