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Financial Derivatives (Schedule Of Derivative Instruments, Effect On Other Comprehensive Income (Loss)) (Details) - Foreign Currency Forward Contracts [Member] - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Derivatives, Fair Value [Line Items]    
Foreign currency forward contracts, net of tax expense of $57 and $610 $ 123 $ 918
Tax (benefit) expense $ 57 $ 610