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Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($)
$ in Thousands
Aug. 31, 2020
Aug. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Embedded Derivative, Fair Value of Embedded Derivative Asset $ 19,000  
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred Compensation Assets, at Fair Value 47,669 $ 40,368
Embedded Derivative, Fair Value of Embedded Derivative Asset 18,998 21,364
Securities Segregated under Other Regulations 85,950 77,777
Other assets 5,276 6,519
Total assets 530,961 414,417
Total liabilities 421,630 249,461
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred Compensation Assets, at Fair Value 0 0
Embedded Derivative, Fair Value of Embedded Derivative Asset 0 0
Securities Segregated under Other Regulations 0  
Other assets 0 0
Total assets 0 0
Total liabilities 0 0
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred Compensation Assets, at Fair Value 0 0
Embedded Derivative, Fair Value of Embedded Derivative Asset 18,998 21,364
Securities Segregated under Other Regulations 0  
Other assets 0 0
Total assets 386,304 221,936
Total liabilities 415,593 209,156
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred Compensation Assets, at Fair Value 47,669 40,368
Embedded Derivative, Fair Value of Embedded Derivative Asset 0 0
Securities Segregated under Other Regulations 85,950 77,777
Other assets 5,276 6,519
Total assets 144,657 192,481
Total liabilities 6,037 40,305
Fair Value, Measurements, Recurring | Commodity derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 361,545 248,209
Derivative Liability 352,163 228,760
Fair Value, Measurements, Recurring | Commodity derivatives | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
Fair Value, Measurements, Recurring | Commodity derivatives | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 355,783 180,392
Derivative Liability 346,126 188,455
Fair Value, Measurements, Recurring | Commodity derivatives | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 5,762 67,817
Derivative Liability 6,037 40,305
Fair Value, Measurements, Recurring | Foreign currency derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure 11,523 10,339
Foreign Currency Contracts, Liability, Fair Value Disclosure 69,467 20,701
Fair Value, Measurements, Recurring | Foreign currency derivatives | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure 0 0
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Fair Value, Measurements, Recurring | Foreign currency derivatives | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure 11,523 10,339
Foreign Currency Contracts, Liability, Fair Value Disclosure 69,467 20,701
Fair Value, Measurements, Recurring | Foreign currency derivatives | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure 0 0
Foreign Currency Contracts, Liability, Fair Value Disclosure $ 0 0
Fair Value, Measurements, Recurring | Interest rate swap derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset   9,841
Fair Value, Measurements, Recurring | Interest rate swap derivatives | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset   $ 9,841