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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
May 31, 2020
Aug. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets $ 44,668 $ 40,368
Embedded derivative asset 18,636 21,364
Securities Segregated under Other Regulations 94,233 77,777
Other assets 5,478 6,519
Total assets 593,566 414,417
Foreign exchange derivatives   20,701
Total liabilities 391,412 249,461
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 44,668 40,368
Embedded derivative asset 0 0
Securities Segregated under Other Regulations 94,233 77,777
Other assets 5,478 6,519
Total assets 188,164 192,481
Foreign exchange derivatives   0
Total liabilities 89,891 40,305
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 18,636 21,364
Securities Segregated under Other Regulations 0 0
Other assets 0 0
Total assets 405,402 221,936
Foreign exchange derivatives   20,701
Total liabilities 301,521 209,156
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 416,818 248,209
Derivative Liability 298,450 228,760
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 43,785 67,817
Derivative Liability 89,891 40,305
Commodity derivatives | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 373,033 180,392
Derivative Liability 208,559 188,455
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 13,733 10,339
Foreign exchange derivatives 92,962  
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 13,733 10,339
Foreign exchange derivatives 92,962  
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  
Interest rate swap derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset   9,841
Interest rate swap 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   0
Interest rate swap derivatives | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset   9,841
Interest rate swap derivatives | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset   $ 0