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Financial Derivatives (Schedule of Financial Derivatives) (Details) - USD ($)
$ in Thousands
Feb. 29, 2020
Aug. 31, 2019
Feb. 28, 2019
Derivatives Designated As Hedging Instruments [Member]      
Derivatives, Fair Value [Line Items]      
Total derivatives $ 247 $ 1,073 $ 387
Derivatives Designated As Hedging Instruments [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 247 1,073 396
Derivatives Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liabilities 0 0 (9)
Derivatives Not Designated As Hedging Instruments [Member]      
Derivatives, Fair Value [Line Items]      
Total derivatives 0 39 17
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 0 39 30
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liabilities $ 0 $ 0 $ (13)