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Fair Value Measurements (Details) - USD ($)
$ in Thousands
May 31, 2026
Aug. 31, 2025
Assets    
Securities Segregated under Other Regulations $ 155,549 $ 169,978
Other assets 33,513 32,139
Total 772,013 459,725
Liabilities    
Total 538,114 179,679
Time deposits    
Assets    
Debt securities available for sale $ 689  
Time deposits | Minimum | Foreign    
Liabilities    
Debt securities original maturities 90 days  
Money market funds    
Assets    
Debt securities available for sale $ 257,040 78,393
Commodity derivatives    
Assets    
Derivative assets 257,392 135,688
Liabilities    
Derivative Liability 529,961 167,908
Foreign exchange derivatives    
Assets    
Derivative assets 67,830 43,527
Liabilities    
Derivative Liability 8,153 11,771
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Securities Segregated under Other Regulations 29,911 34,303
Other assets 33,513 32,139
Total 322,274 147,988
Liabilities    
Total 2,923 1,110
Quoted Prices in Active Markets for Identical Assets (Level 1) | Time deposits    
Assets    
Debt securities available for sale 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds    
Assets    
Debt securities available for sale 257,040 78,393
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity derivatives    
Assets    
Derivative assets 1,810 3,153
Liabilities    
Derivative Liability 2,923 1,110
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange derivatives    
Assets    
Derivative assets 0 0
Liabilities    
Derivative Liability 0 0
Significant Other Observable Inputs (Level 2)    
Assets    
Securities Segregated under Other Regulations 125,638 135,675
Other assets 0 0
Total 449,739 311,737
Liabilities    
Total 535,191 178,569
Significant Other Observable Inputs (Level 2) | Time deposits    
Assets    
Debt securities available for sale 689  
Significant Other Observable Inputs (Level 2) | Money market funds    
Assets    
Debt securities available for sale 0 0
Significant Other Observable Inputs (Level 2) | Commodity derivatives    
Assets    
Derivative assets 255,582 132,535
Liabilities    
Derivative Liability 527,038 166,798
Significant Other Observable Inputs (Level 2) | Foreign exchange derivatives    
Assets    
Derivative assets 67,830 43,527
Liabilities    
Derivative Liability 8,153 11,771
Significant Unobservable Inputs (Level 3)    
Assets    
Securities Segregated under Other Regulations 0 0
Other assets 0 0
Total 0 0
Liabilities    
Total 0 0
Significant Unobservable Inputs (Level 3) | Time deposits    
Assets    
Debt securities available for sale 0  
Significant Unobservable Inputs (Level 3) | Money market funds    
Assets    
Debt securities available for sale 0 0
Significant Unobservable Inputs (Level 3) | Commodity derivatives    
Assets    
Derivative assets 0 0
Liabilities    
Derivative Liability 0 0
Significant Unobservable Inputs (Level 3) | Foreign exchange derivatives    
Assets    
Derivative assets 0 0
Liabilities    
Derivative Liability $ 0 $ 0