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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
May 31, 2023
Aug. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities Segregated under Other Regulations $ 221,295 $ 238,124
Other assets 49,066 58,280
Total assets 758,200 840,648
Foreign exchange derivatives   12,649
Total liabilities 367,790 402,788
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities Segregated under Other Regulations 221,295 238,124
Other assets 49,066 58,280
Total assets 272,479 297,565
Foreign exchange derivatives   0
Total liabilities 8,372 10,256
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities Segregated under Other Regulations 0 0
Other assets 0 0
Total assets 485,721 543,083
Foreign exchange derivatives   12,649
Total liabilities 359,418 392,532
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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 448,216 491,321
Derivative Liability 354,529 390,139
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 2,118 1,161
Derivative Liability 8,372 10,256
Commodity derivatives | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 446,098 490,160
Derivative Liability 346,157 379,883
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 39,623 52,923
Foreign exchange derivatives 13,261  
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 39,623 52,923
Foreign exchange derivatives 13,261  
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