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Fair Value Measurements - Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Aug. 31, 2023 | Aug. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities Segregated under Other Regulations | $ 225,715 | $ 238,124
Other assets | 89,592 | 58,280
Total assets | 636,544 | 840,648
Total liabilities | 368,275 | 402,788
Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities Segregated under Other Regulations | 0 |
Other assets | 0 | 0
Total assets | 0 | 0
Total liabilities | 0 | 0
Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities Segregated under Other Regulations | 0 |
Other assets | 0 | 0
Total assets | 315,893 | 543,083
Total liabilities | 360,774 | 392,532
Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Securities Segregated under Other Regulations | 225,715 | 238,124
Other assets | 89,592 | 58,280
Total assets | 320,651 | 297,565
Total liabilities | 7,501 | 10,256
Commodity derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments and Hedges, Liabilities | 354,476 | 390,139
Derivative Instruments and Hedges, Assets | 288,835 | 491,321
Commodity derivatives | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments and Hedges, Liabilities | 0 | 0
Derivative Instruments and Hedges, Assets | 0 | 0
Commodity derivatives | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments and Hedges, Liabilities | 346,975 | 379,883
Derivative Instruments and Hedges, Assets | 283,491 | 490,160
Commodity derivatives | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Instruments and Hedges, Liabilities | 7,501 | 10,256
Derivative Instruments and Hedges, Assets | 5,344 | 1,161
Foreign currency derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 32,402 | 52,923
Foreign Currency Contracts, Liability, Fair Value Disclosure | 13,799 | 12,649
Foreign currency derivatives | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0
Foreign currency derivatives | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 32,402 | 52,923
Foreign Currency Contracts, Liability, Fair Value Disclosure | 13,799 | 12,649
Foreign currency derivatives | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0 | 0
Foreign Currency Contracts, Liability, Fair Value Disclosure | $ 0 | $ 0

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