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Financial Derivatives (Schedule of Financial Derivatives) (Details) - USD ($)
$ in Thousands
Nov. 30, 2019
Aug. 31, 2019
Nov. 30, 2018
Derivatives Designated As Hedging Instruments [Member]      
Derivatives, Fair Value [Line Items]      
Total derivatives $ (115) $ 1,073 $ 625
Derivatives Designated As Hedging Instruments [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 0 1,073 873
Derivatives Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liabilities (115) 0 (248)
Derivatives Not Designated As Hedging Instruments [Member]      
Derivatives, Fair Value [Line Items]      
Total derivatives 13 39 6
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Derivative assets 13 39 51
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Derivative liabilities $ 0 $ 0 $ (45)