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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
May 31, 2022
Aug. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets $ 47,435 $ 51,940
Embedded derivative asset 13,545 16,488
Securities Segregated under Other Regulations 319,551 99,837
Other assets 5,965 6,052
Total assets 1,283,063 738,452
Foreign exchange derivatives   8,506
Total liabilities 679,266 454,368
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 47,435 51,940
Embedded derivative asset 0 0
Securities Segregated under Other Regulations 319,551 99,837
Other assets 5,965 6,052
Total assets 374,741 160,282
Foreign exchange derivatives   0
Total liabilities 3,678 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 13,545 16,488
Securities Segregated under Other Regulations 0 0
Other assets 0 0
Total assets 908,322 578,170
Foreign exchange derivatives   8,506
Total liabilities 675,588 452,753
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 781,763 544,706
Derivative Liability 663,812 445,862
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 1,790 2,453
Derivative Liability 3,678 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 779,973 542,253
Derivative Liability 660,134 444,247
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 114,804 19,429
Foreign exchange derivatives 15,454  
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 114,804 19,429
Foreign exchange derivatives 15,454  
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