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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Feb. 29, 2020
Aug. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets $ 45,579 $ 40,368
Embedded derivative asset 18,281 21,364
Securities Segregated under Other Regulations 78,816 77,777
Other assets 5,965 6,519
Total assets 446,897 414,417
Foreign exchange derivatives   20,701
Total liabilities 274,062 249,461
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 45,579 40,368
Embedded derivative asset 0 0
Securities Segregated under Other Regulations 78,816 77,777
Other assets 5,965 6,519
Total assets 158,681 192,481
Foreign exchange derivatives   0
Total liabilities 61,080 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 18,281 21,364
Securities Segregated under Other Regulations 0 0
Other assets 0 0
Total assets 288,216 221,936
Foreign exchange derivatives   20,701
Total liabilities 212,982 209,156
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 279,181 248,209
Derivative Liability 221,245 228,760
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 28,321 67,817
Derivative Liability 61,080 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 250,860 180,392
Derivative Liability 160,165 188,455
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 6,426 10,339
Foreign exchange derivatives 52,817  
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 6,426 10,339
Foreign exchange derivatives 52,817  
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 12,649 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 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 12,649 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 $ 0