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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 6 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Foreign currency losses $ 26,200 $ 7,600 $ 99,100 $ 36,400
Forward foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain Recognized in Net Income on Derivatives $ 36,437 $ 6,801 $ 120,443 $ 33,518