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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Feb. 28, 2021 | Aug. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | $ 49,314 | $ 47,669
Embedded derivative asset | 15,865 | 18,998
Securities Segregated under Other Regulations | 185,224 | 85,950
Other assets | 5,991 | 5,276
Total assets | 1,254,845 | 530,961
Foreign exchange derivatives |  | 69,467
Total liabilities | 580,826 | 421,630
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | 49,314 | 47,669
Embedded derivative asset | 0 | 0
Securities Segregated under Other Regulations | 185,224 | 85,950
Other assets | 5,991 | 5,276
Total assets | 242,385 | 144,657
Foreign exchange derivatives |  | 0
Total liabilities | 4,409 | 6,037
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | 0 | 0
Embedded derivative asset | 15,865 | 18,998
Securities Segregated under Other Regulations | 0 | 0
Other assets | 0 | 0
Total assets | 1,012,460 | 386,304
Foreign exchange derivatives |  | 69,467
Total liabilities | 576,417 | 415,593
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | 0 | 0
Embedded derivative asset | 0 | 0
Securities Segregated under Other Regulations | 0 | 0
Other assets | 0 | 0
Total assets | 0 | 0
Foreign exchange derivatives |  | 0
Total liabilities | 0 | 0
Commodity derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 991,149 | 361,545
Derivative Liability | 516,157 | 352,163
Commodity derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 1,856 | 5,762
Derivative Liability | 4,409 | 6,037
Commodity derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 989,293 | 355,783
Derivative Liability | 511,748 | 346,126
Commodity derivatives | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Derivative Liability | 0 | 0
Foreign exchange derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign exchange derivatives | 7,302 | 11,523
Foreign exchange derivatives | 64,669 |
Foreign exchange derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign exchange derivatives | 0 | 0
Foreign exchange derivatives | 0 |
Foreign exchange derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign exchange derivatives | 7,302 | 11,523
Foreign exchange derivatives | 64,669 |
Foreign exchange derivatives | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign exchange derivatives | 0 | $ 0
Foreign exchange derivatives | $ 0 |

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