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Description of Business and Summary of Significant Accounting Policies (Reclassification from AOCI) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Realized losses (gains) on derivative instruments:
Foreign exchange contracts	$ 25,335,625	$ 23,368,919	$ 20,388,624
Interest rate contracts	173,877	188,730	149,002
Actuarial (gain) loss	(4,159)	741	1,127
Prior service credit	(45)	(44)	(88)
Loss on securities	48,625	29,632	0
Total amounts reclassified from AOCI	(260,738)	(450,704)	(373,401)
Reduction in income tax expense	(203,959)	(161,230)	(285,860)
Reclassification out of AOCI
Realized losses (gains) on derivative instruments:
Total amounts reclassified from AOCI	46,622	54,289	(22,037)
Reclassification out of AOCI | Realized losses (gains) on derivative instruments
Realized losses (gains) on derivative instruments:
Loss to be reclassified in next 12 months	4,700
Reduction in income tax expense			14,800
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Foreign exchange contracts
Realized losses (gains) on derivative instruments:
Foreign exchange contracts	15,507	21,982	(9,379)
Reclassification out of AOCI | Realized losses (gains) on derivative instruments | Interest rate contracts
Realized losses (gains) on derivative instruments:
Interest rate contracts	(1,101)	(1,723)	(13,697)
Reclassification out of AOCI | Actuarial (gain) loss
Realized losses (gains) on derivative instruments:
Actuarial (gain) loss	(4,159)	741	1,127
Reclassification out of AOCI | Prior service credit
Realized losses (gains) on derivative instruments:
Prior service credit	(45)	(44)	(88)
Reclassification out of AOCI | Available for sale securities
Realized losses (gains) on derivative instruments:
Loss on securities	$ 36,420	$ 33,333	$ 0

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