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Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands | Aug. 31, 2021 | Aug. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Embedded Derivative, Fair Value of Embedded Derivative Asset | $ 16,500 |
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred Compensation Assets, at Fair Value | 51,940 | $ 47,669
Embedded Derivative, Fair Value of Embedded Derivative Asset | 16,488 | 18,998
Securities Segregated under Other Regulations | 99,837 | 85,950
Other assets | 6,052 | 5,276
Total assets | 738,452 | 530,961
Total liabilities | 454,368 | 421,630
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred Compensation Assets, at Fair Value | 0 | 0
Embedded Derivative, Fair Value of Embedded Derivative Asset | 0 | 0
Securities Segregated under Other Regulations | 0 |
Other assets | 0 | 0
Total assets | 0 | 0
Total liabilities | 0 | 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred Compensation Assets, at Fair Value | 0 | 0
Embedded Derivative, Fair Value of Embedded Derivative Asset | 16,488 | 18,998
Securities Segregated under Other Regulations | 0 |
Other assets | 0 | 0
Total assets | 578,170 | 386,304
Total liabilities | 452,753 | 415,593
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred Compensation Assets, at Fair Value | 51,940 | 47,669
Embedded Derivative, Fair Value of Embedded Derivative Asset | 0 | 0
Securities Segregated under Other Regulations | 99,837 | 85,950
Other assets | 6,052 | 5,276
Total assets | 160,282 | 144,657
Total liabilities | 1,615 | 6,037
Fair Value, Measurements, Recurring | Commodity derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 544,706 | 361,545
Derivative Liability | 445,862 | 352,163
Fair Value, Measurements, Recurring | Commodity derivatives | Fair Value, Inputs, Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Derivative Liability | 0 | 0
Fair Value, Measurements, Recurring | Commodity derivatives | Fair Value, Inputs, Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 542,253 | 355,783
Derivative Liability | 444,247 | 346,126
Fair Value, Measurements, Recurring | Commodity derivatives | Fair Value, Inputs, Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 2,453 | 5,762
Derivative Liability | 1,615 | 6,037
Fair Value, Measurements, Recurring | Foreign currency derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 19,429 | 11,523
Foreign Currency Contracts, Liability, Fair Value Disclosure | 8,506 | 69,467
Fair Value, Measurements, Recurring | 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
Fair Value, Measurements, Recurring | 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 | 19,429 | 11,523
Foreign Currency Contracts, Liability, Fair Value Disclosure | 8,506 | 69,467
Fair Value, Measurements, Recurring | 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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