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Fair Value Measurements - Fair Value Measurements (Details) (Fair Value, Measurements, Recurring, USD $)
In Thousands, unless otherwise specified
Aug. 31, 2014
Aug. 31, 2013
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 $ 0 $ 0
Deferred Compensation Assets, at Fair Value 83,217 105,936
Other assets 8,778 8,148
Total assets 173,108 179,419
Foreign Currency Contracts, Liability, Fair Value Disclosure 2,248 5,925
Total liabilities 119,938 65,109
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign Exchange Contract [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure 2,523 6,894
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity and Freight Derivatives [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 78,590 58,441
Derivative Liability 117,690 59,184
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 Asset 0 0
Derivative Liability 0 0
Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory, Current, Fair Value Disclosure 921,554 1,203,383
Deferred Compensation Assets, at Fair Value 0 0
Other assets 0 0
Total assets 1,444,374 1,637,940
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Total liabilities 480,052 399,958
Significant Other Observable Inputs (Level 2) | Foreign Exchange Contract [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure 0 185
Significant Other Observable Inputs (Level 2) | Commodity and Freight Derivatives [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 518,620 410,233
Derivative Liability 479,922 399,710
Significant Other Observable Inputs (Level 2) | Interest Rate Swap [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 4,200 24,139
Derivative Liability 130 248
Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Inventory, Current, Fair Value Disclosure 0 0
Deferred Compensation Assets, at Fair Value 0 0
Other assets 0 0
Total assets 0 0
Foreign Currency Contracts, Liability, Fair Value Disclosure 0 0
Total liabilities 114,917 134,134
Significant Unobservable Inputs (Level 3) | Foreign Exchange Contract [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure 0 0
Significant Unobservable Inputs (Level 3) | Commodity and Freight Derivatives [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
Significant Unobservable Inputs (Level 3) | Interest Rate Swap [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
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 921,554 1,203,383
Deferred Compensation Assets, at Fair Value 83,217 105,936
Other assets 8,778 8,148
Total assets 1,617,482 1,817,359
Foreign Currency Contracts, Liability, Fair Value Disclosure 2,248 5,925
Total liabilities 714,907 599,201
Estimate of Fair Value, Fair Value Disclosure [Member] | Foreign Exchange Contract [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign Currency Contract, Asset, Fair Value Disclosure 2,523 7,079
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity and Freight Derivatives [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 597,210 468,674
Derivative Liability 597,612 458,894
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 Asset 4,200 24,139
Derivative Liability 130 248
NCRA [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest 0 0
NCRA [Member] | Significant Other Observable Inputs (Level 2)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest 0 0
NCRA [Member] | Significant Unobservable Inputs (Level 3)
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest 114,917 134,134
NCRA [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest $ 114,917 $ 134,134