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, 2017	Aug. 31, 2016
Designated as Hedging Instruments | Accrued expenses
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Liability Derivatives	$ 1,400	$ 1,986
Designated as Hedging Instruments | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Asset Derivatives	4,200	420
Not Designated as Hedging Instrument | Accrued expenses
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Liability Derivatives	11,572	10,801
Not Designated as Hedging Instrument | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Forward foreign exchange contracts, Asset Derivatives	$ 15,266	$ 3,850