Note 5 - Derivative Instruments - Derivatives in Cash Flow Hedging Relationships (Details) - Cash Flow Hedging [Member] - Designated as Hedging Instrument [Member] - Foreign Exchange Contract [Member] - Selling, General and Administrative Expenses [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Feb. 28, 2018	Feb. 28, 2017
(Loss) Gain Recognized in AOCL on Derivatives	$ (1,346)	$ 1,188	$ (1,345)	$ 539
Gain (Loss) Reclassified from AOCL into Income (Effective Portion)	$ 824	$ (1,030)	$ 1,589	$ (2,387)