Accumulated Other Comprehensive (Loss) Income (Reclassification from AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2021	May 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ (6,646,845)	$ (5,879,494)	$ (20,103,436)	$ (18,526,311)
Interest expense	(33,803)	(41,873)	(97,175)	(132,967)
Income before income tax	213,295	13,773	707,240	145,490
Gain (loss) to be reclassified in next 12 months			7,900
Income tax expense	43,277	64,036	183,861	157,620
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	(3,495)	16,020	(40,580)	19,355
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	(4,309)	16,451	(43,021)	20,648
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	814	(431)	2,441	(1,293)
Reclassification out of AOCI | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income tax expense	$ 0	$ 0	$ 0	$ 0