Derivatives - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Derivative [Line Items]
Gain (Loss) on Foreign Currency Fair Value Hedge Derivatives and Not Designated as Hedging Instruments at Fair Value	$ (1,520)	$ (95)	$ (13,500)
Fair Value, Inputs, Level 2
Derivative [Line Items]
Foreign Currency Contracts Net Assets (Liabilities) Fair Value Disclosure	(680)	(234)
Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount		500
Fair Value Hedging [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 143,400	$ 170,700