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Financial Derivatives (Schedule Of Financial Derivatives) (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 31, 2017
Derivatives Designated As Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total derivatives $ 775 $ (1,633)
Derivatives Designated As Hedging Instruments [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 775  
Derivatives Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities   (1,633)
Derivatives Not Designated As Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total derivatives 111 (105)
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 123 9
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ (12) $ (114)