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Accumulated Other Comprehensive Income (Reclassification from AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of revenue $ 7,197,969 $ 6,951,859
Interest expense 32,346 44,911
Income before income tax 285,407 102,640
Gain (loss) to be reclassified in next 12 months 14,500  
Reclassification out of AOCI | Realized losses (gain) on derivative instruments    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Income before income tax (15,551) 6,883
Reclassification out of AOCI | Realized losses (gain) on derivative instruments | Foreign exchange contracts    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Cost of revenue (16,368) 7,314
Reclassification out of AOCI | Realized losses (gain) on derivative instruments | Interest rate contracts    
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]    
Interest expense $ 817 $ (431)