Derivatives Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Aug. 31, 2017
Derivative [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure	$ 100
Foreign Currency Contracts, Liability, Fair Value Disclosure			$ (200)
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives and Not Designated as Hedging Instruments at Fair Value	214	$ (1,491)
Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 22,500		$ 22,000