Financial Derivatives (Schedule Of Derivative Instruments, Effect On Other Comprehensive Income (Loss)) (Details) - Foreign Currency Forward Contracts [Member] - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017	Aug. 31, 2016
Derivatives, Fair Value [Line Items]
Foreign currency forward contracts, net of tax expense (benefit) of $498, ($927), and $52	$ (1,103)	$ 1,710	$ (204)
Tax (benefit) expense	$ 498	$ (927)	$ 52