Financial Derivatives (Schedule Of Derivative Instruments, Effect On Other Comprehensive Income (Loss)) (Details) - Foreign Currency Forward Contracts [Member] - Net Investment Hedging [Member] - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Derivatives, Fair Value [Line Items]
Foreign currency forward contracts, net of tax (benefit) expense	$ 1,710	$ (204)	$ (3,420)
Tax (benefit) expense	$ (927)	$ 52	$ 2,083