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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | May 31, 2021 | Aug. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | $ 50,660 | $ 47,669
Embedded derivative asset | 16,173 | 18,998
Securities Segregated under Other Regulations | 195,197 | 85,950
Other assets | 6,563 | 5,276
Total assets | 1,152,896 | 530,961
Foreign exchange derivatives |  | 69,467
Total liabilities | 602,326 | 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 | 50,660 | 47,669
Embedded derivative asset | 0 | 0
Securities Segregated under Other Regulations | 195,197 | 85,950
Other assets | 6,563 | 5,276
Total assets | 254,769 | 144,657
Foreign exchange derivatives |  | 0
Total liabilities | 1,037 | 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 | 16,173 | 18,998
Securities Segregated under Other Regulations | 0 | 0
Other assets | 0 | 0
Total assets | 898,127 | 386,304
Foreign exchange derivatives |  | 69,467
Total liabilities | 601,289 | 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 | 854,971 | 361,545
Derivative Liability | 592,419 | 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 | 2,349 | 5,762
Derivative Liability | 1,037 | 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 | 852,622 | 355,783
Derivative Liability | 591,382 | 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 | 29,332 | 11,523
Foreign exchange derivatives | 9,907 |
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 | 29,332 | 11,523
Foreign exchange derivatives | 9,907 |
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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