Financial Derivatives (Schedule Of Financial Derivatives) (Details) - USD ($) $ in Thousands	May 31, 2018	Aug. 31, 2017	May 31, 2017
Derivatives Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	$ 2,100	$ (1,633)	$ (2,109)
Derivatives Designated As Hedging Instruments [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	2,149
Derivatives Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	(49)	(1,633)	(2,109)
Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total derivatives	81	(105)	68
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	92	9	71
Derivatives Not Designated As Hedging Instruments [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ (11)	$ (114)	$ (3)