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Derivative Financial Instruments and Hedging Activities (Derivatives Not Designated As Hedging Instruments) (Details) - Cost of revenue - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Aug. 31, 2018
Derivative [Line Items]      
Foreign currency gain $ 47,400 $ 14,900 $ 36,700
Forward foreign exchange contracts      
Derivative [Line Items]      
Amount of Gain (Loss) Recognized in Net Income on Derivatives $ 42,077 $ (29,557) $ (27,774)