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Derivative Financial Instruments and Hedging Activities (Details 3) - Prepaid expenses and other current assets - Forward foreign exchange contracts - USD ($)
$ in Thousands
Aug. 31, 2017
Aug. 31, 2016
Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Forward foreign exchange contracts, Asset Derivatives $ 8,380 $ 420
Forward foreign exchange contracts, Liability Derivatives 1,408 1,986
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Forward foreign exchange contracts, Asset Derivatives 31,280 3,850
Forward foreign exchange contracts, Liability Derivatives $ 9,131 $ 10,801