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Fair Value Measurements - Fair Value Measurements (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
May 31, 2013
Aug. 31, 2012
May 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Inventory, Current, Fair Value Disclosure        
Foreign Currency Contract, Asset, Fair Value Disclosure 4,188 957 3,843
Other assets 131,901 75,000 72,439
Total assets 152,319 146,543 151,264
Foreign currency derivatives 3,028 2,366 3,379
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest       
Total liabilities 65,026 152,415 35,601
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity and feight derivatives
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Commodity and freight derivatives, assets 16,230 70,586 74,982
Derivative liabilities 61,998 150,049 32,222
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest Rate Swap [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liabilities       
Significant Other Observable Inputs (Level 2)
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Inventory, Current, Fair Value Disclosure 1,433,639 1,702,757 1,324,367
Foreign Currency Contract, Asset, Fair Value Disclosure       
Other assets        
Total assets 1,700,885 2,481,119 1,604,644
Foreign currency derivatives       
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest       
Total liabilities 154,653 356,590 261,441
Significant Other Observable Inputs (Level 2) | Commodity and feight derivatives
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Commodity and freight derivatives, assets 258,086 778,362 280,277
Derivative liabilities 154,349 356,046 260,906
Significant Other Observable Inputs (Level 2) | Interest Rate Swap [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Assets - Interest Rate Swaps 9,160    
Derivative liabilities 304 544 535
Significant Unobservable Inputs (Level 3)
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Inventory, Current, Fair Value Disclosure        
Foreign Currency Contract, Asset, Fair Value Disclosure       
Other assets        
Total assets        
Foreign currency derivatives       
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest 146,245 127,516 98,447
Total liabilities 146,245 127,516 98,447
Significant Unobservable Inputs (Level 3) | Commodity and feight derivatives
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Commodity and freight derivatives, assets        
Derivative liabilities       
Significant Unobservable Inputs (Level 3) | Interest Rate Swap [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative liabilities       
Estimate of Fair Value, Fair Value Disclosure [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Inventory, Current, Fair Value Disclosure 1,433,639 1,702,757 1,324,367
Foreign Currency Contract, Asset, Fair Value Disclosure 4,188 957 3,843
Other assets 131,901 75,000 72,439
Total assets 1,853,204 2,627,662 1,755,908
Foreign currency derivatives 3,028 2,366 3,379
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest 146,245 127,516 98,447
Total liabilities 365,924 636,521 395,489
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity and feight derivatives
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Commodity and freight derivatives, assets 274,316 848,948 355,259
Derivative liabilities 216,347 506,095 293,128
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest Rate Swap [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative Assets - Interest Rate Swaps 9,160    
Derivative liabilities $ 304 $ 544 $ 535