Accumulated Other Comprehensive Income (Reclassification from AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2020	May 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 5,879,494	$ 5,691,803	$ 18,526,311	$ 17,290,544
Interest expense	41,873	50,514	132,967	139,326
Income before income tax	13,773	83,078	145,490	348,791
Gain (loss) to be reclassified in next 12 months			4,400
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	16,020		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	16,451		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	$ (431)		$ (1,293)
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		(1,728)		15,958
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		(1,298)		17,248
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)		$ (1,290)