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Financial Derivatives (Schedule Of Financial Derivatives) (Details) - USD ($) $ in Thousands	Nov. 30, 2018	Aug. 31, 2018	Nov. 30, 2017
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	$ 625	$ 775	$ (365)
Derivatives Designated As Hedging Instruments [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	873	775
Derivatives Designated As Hedging Instruments [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(248)		(365)
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	6	111	(86)
Derivatives Not Designated As Hedging Instruments [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	51	123	34
Derivatives Not Designated As Hedging Instruments [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (45)	$ (12)	$ (120)