Derivative Financial Instruments and Hedging Activities - Pretax Gains (Losses) On Derivatives Not Accounted For As Hedging Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 35,825	$ 10,347
Commodity derivatives | Cost of goods sold
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	42,674	(6,448)
Foreign exchange derivatives | Cost of goods sold
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(10,161)	16,056
Foreign exchange derivatives | Selling, General and Administrative Expenses [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1,743	(832)
Embedded Derivative Financial Instruments [Member] | Other Income [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 1,569	$ 1,571