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Derivative Financial Instruments and Hedging Activities - Gross Fair Values of Derivative Assets, Derivative Liabilities, and Margin Deposits (Cash Collateral) (Details) - USD ($) $ in Thousands	Nov. 30, 2020	Aug. 31, 2020
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 674,702	$ 358,300
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	665,037	345,935
Derivative Liability, Fair Value, Gross Liability	564,364	412,809
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	545,398	396,890
Not Designated as Hedging Instrument | Commodity derivatives
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	642,455	327,493
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	640,419	324,513
Derivative Liability, Fair Value, Gross Liability	519,909	343,343
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	508,572	336,809
Not Designated as Hedging Instrument | Foreign exchange derivatives
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	16,684	11,809
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	9,055	2,424
Derivative Liability, Fair Value, Gross Liability	44,455	69,466
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	36,826	60,081
Not Designated as Hedging Instrument | Embedded Derivative Financial Instruments [Member]
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	15,563	18,998
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	$ 15,563	$ 18,998

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