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Financial Derivatives (Schedule of Derivative Instruments, Effect on Other Comprehensive Income) (Parenthetical) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 31, 2020
May 31, 2019
May 31, 2020
May 31, 2019
Foreign Currency Forward Contracts [Member]        
Derivatives, Fair Value [Line Items]        
Tax expense $ 63 $ 182 $ 123 $ 368