Derivatives Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	Aug. 31, 2014
Derivative [Line Items]
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives and Not Designated as Hedging Instruments at Fair Value	$ 55,000	$ (2,619,000)	$ (2,006,000)	$ (11,310,000)
Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 191,500,000		$ 191,500,000		$ 219,900,000