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Fair Value Measurements - Fair Value Measurements (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Aug. 31, 2013
Aug. 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 derivatives 6,894 978
Other assets 114,084 75,000
Total assets 179,419 197,991
Foreign currency derivatives 5,925 2,388
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest      
Total liabilities 65,109 203,863
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 At Fair Value 58,441 122,013
Derivative liabilities 59,184 201,475
Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory, Current, Fair Value Disclosure 1,203,383 1,702,757
Foreign currency derivatives 185   
Other assets      
Total assets 1,637,940 2,651,544
Foreign currency derivatives     
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest      
Total liabilities 399,958 645,996
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 At Fair Value 410,233 948,787
Derivative liabilities 399,710 645,452
Significant Other Observable Inputs (Level 2) | Interest Rate Swap [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest Rate Derivative Assets, at Fair Value 24,139  
Interest Rate Derivative Liabilities, at Fair Value 248 544
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 derivatives      
Other assets      
Total assets      
Foreign currency derivatives     
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest 134,134 127,516
Total liabilities 134,134 127,516
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 At Fair Value      
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 1,203,383 1,702,757
Foreign currency derivatives 7,079 978
Other assets 114,084 75,000
Total assets 1,817,359 2,849,535
Foreign currency derivatives 5,925 2,388
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest 134,134 127,516
Total liabilities 599,201 977,375
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 At Fair Value 468,674 1,070,800
Derivative liabilities 458,894 846,927
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]    
Interest Rate Derivative Assets, at Fair Value 24,139  
Interest Rate Derivative Liabilities, at Fair Value $ 248 $ 544