Accumulated Other Comprehensive Income (Reclassification from AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 6,951,859	$ 5,986,625
Interest expense	44,911	42,652
Income before income tax	102,640	164,887
Gain (loss) to be reclassified in next 12 months	5,000
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	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	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	$ (431)
Reclassification out of AOCI | Realized losses (gains) on derivative instruments
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before income tax		14,185
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue		14,615
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense		$ (430)