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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Nov. 30, 2021 | Aug. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | $ 51,113 | $ 51,940
Embedded derivative asset | 13,034 | 16,488
Securities Segregated under Other Regulations | 96,447 | 99,837
Other assets | 6,616 | 6,052
Total assets | 628,062 | 738,452
Foreign exchange derivatives |  | 8,506
Total liabilities | 324,928 | 454,368
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 | 51,113 | 51,940
Embedded derivative asset | 0 | 0
Securities Segregated under Other Regulations | 96,447 | 99,837
Other assets | 6,616 | 6,052
Total assets | 157,017 | 160,282
Foreign exchange derivatives |  | 0
Total liabilities | 3,860 | 1,615
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 | 13,034 | 16,488
Securities Segregated under Other Regulations | 0 | 0
Other assets | 0 | 0
Total assets | 471,045 | 578,170
Foreign exchange derivatives |  | 8,506
Total liabilities | 321,068 | 452,753
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 | 452,369 | 544,706
Derivative Liability | 297,465 | 445,862
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 | 2,841 | 2,453
Derivative Liability | 3,860 | 1,615
Commodity derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 449,528 | 542,253
Derivative Liability | 293,605 | 444,247
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 | 8,483 | 19,429
Foreign exchange derivatives | 27,463 |
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 | 8,483 | 19,429
Foreign exchange derivatives | 27,463 |
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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