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Financial Derivatives (Schedule Of Financial Derivatives) (Details) - USD ($) $ in Thousands	Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2016
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	$ (365)	$ (1,633)	$ 1,342
Derivatives Designated As Hedging Instruments [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets			1,546
Derivatives Designated As Hedging Instruments [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(365)	(1,633)	(204)
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	(86)	(105)	75
Derivatives Not Designated As Hedging Instruments [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	34	9	123
Derivatives Not Designated As Hedging Instruments [Member] \| Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (120)	$ (114)	$ (48)