Derivative Financial Instruments and Hedging Activities - Derivative Assets and Liabilities Not Designated as Hedging Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2021	Aug. 31, 2020	Aug. 31, 2019
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (942,710)	$ (97,022)	$ 131,091
Commodity derivatives | Cost of goods sold
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(971,581)	89,248	125,323
Foreign exchange derivatives | Cost of goods sold
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	25,277	(184,692)	4,228
Foreign exchange derivatives | Marketing, general and administrative expenses
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1,105	(2,986)	(1,229)
Interest rate derivatives | Interest expense
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	(1,226)	0
Embedded derivative asset | Other income
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 2,489	$ 2,634	$ 2,769