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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, 2021 | Aug. 31, 2021
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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 | $ 467,315 | $ 568,749
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 459,641 | 558,993
Derivative Liability, Fair Value, Gross Liability | 321,092 | 453,367
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 311,272 | 441,126
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 | 445,798 | 532,832
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 442,169 | 528,658
Derivative Liability, Fair Value, Gross Liability | 293,629 | 444,861
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 287,854 | 438,202
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 | 8,483 | 19,429
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 4,438 | 13,847
Derivative Liability, Fair Value, Gross Liability | 27,463 | 8,506
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 23,418 | 2,924
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 | 13,034 | 16,488
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 13,034 | $ 16,488

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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 http://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 http://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 http://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 http://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 http://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 + Details
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