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Derivative Financial Instruments and Hedging Activities (Fair Value of Derivative Instruments Recorded on Consolidated Statements of Operations) (Details) - Cost of revenue - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]    
Foreign currency losses $ 72,900 $ 28,900
Forward foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of Gain Recognized in Net Income on Derivatives $ 84,006 $ 26,718