Derivative Financial Instruments and Hedging Activities (Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets for Foreign Currency Risk Management Purposes) (Details 3) - Forward foreign exchange contracts - USD ($) $ in Thousands	May. 31, 2015	Aug. 31, 2014
Designated as Hedging Instruments | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Asset Derivatives	$ 4,470	$ 6,089
Designated as Hedging Instruments | Accrued expenses
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Liability Derivatives	1,574	1,460
Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Asset Derivatives	10,667	7,995
Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Liability Derivatives	$ 4,034	$ 2,186