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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 | May 31, 2023 | Aug. 31, 2022
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Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 483,141 | $ 517,090
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 465,532 | 504,355
Derivative Liability, Fair Value, Gross Liability | 366,239 | 390,940
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 339,218 | 368,041
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 | 443,518 | 464,167
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 436,724 | 460,333
Derivative Liability, Fair Value, Gross Liability | 352,978 | 378,291
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 336,772 | 364,293
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 | 39,623 | 52,923
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 28,808 | 44,022
Derivative Liability, Fair Value, Gross Liability | 13,261 | 12,649
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | $ 2,446 | $ 3,748

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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