v3.26.1
Fair Value Measurements (Details) - USD ($)
$ in Thousands
Feb. 28, 2026
Aug. 31, 2025
Assets    
Securities Segregated under Other Regulations $ 158,638 $ 169,978
Other assets 34,874 32,139
Total 722,991 459,725
Liabilities    
Total 368,703 179,679
Time deposits    
Assets    
Debt securities available for sale $ 148,211  
Time deposits | Minimum | Foreign    
Liabilities    
Debt securities original maturities 90 days  
Money market funds    
Assets    
Debt securities available for sale $ 108,190 78,393
Commodity derivatives    
Assets    
Derivative assets 194,032 135,688
Liabilities    
Derivative Liability 334,095 167,908
Foreign exchange derivatives    
Assets    
Derivative assets 79,046 43,527
Liabilities    
Derivative Liability 34,608 11,771
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets    
Securities Segregated under Other Regulations 33,028 34,303
Other assets 34,874 32,139
Total 176,945 147,988
Liabilities    
Total 1,186 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 108,190 78,393
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity derivatives    
Assets    
Derivative assets 853 3,153
Liabilities    
Derivative Liability 1,186 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 125,610 135,675
Other assets 0 0
Total 546,046 311,737
Liabilities    
Total 367,517 178,569
Significant Other Observable Inputs (Level 2) | Time deposits    
Assets    
Debt securities available for sale 148,211  
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 193,179 132,535
Liabilities    
Derivative Liability 332,909 166,798
Significant Other Observable Inputs (Level 2) | Foreign exchange derivatives    
Assets    
Derivative assets 79,046 43,527
Liabilities    
Derivative Liability 34,608 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