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, 2023	Aug. 31, 2023
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 240,535	$ 312,842
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	230,361	295,646
Derivative Liability, Fair Value, Gross Liability	287,643	362,930
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	273,913	344,229
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	216,283	280,440
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	213,278	275,574
Derivative Liability, Fair Value, Gross Liability	275,972	349,131
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	269,411	342,760
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	24,252	32,402
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	17,083	20,072
Derivative Liability, Fair Value, Gross Liability	11,671	13,799
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	$ 4,502	$ 1,469