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Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Thousands | May. 31, 2015 | Aug. 31, 2014
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Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Inventory, Current, Fair Value Disclosure | $ 1,227,368 | $ 921,554
Deferred Compensation Assets, Fair Value Disclosure | 75,723 | 83,217
Other Assets, Fair Value Disclosure | 11,150 | 8,778
Total assets | 1,919,265 | 1,617,482
Foreign Currency Contracts, Liability, Fair Value Disclosure | 22,887 | 2,248
Total liabilities | 638,392 | 714,907
Fair Value, Measurements, Recurring [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 | 16,783 | 2,523
Fair Value, Measurements, Recurring [Member] | Commodity and Freight Derivatives [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 573,592 | 597,210
Derivative Liability | 500,137 | 597,612
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 14,649 | 4,200
Derivative Liability | 6,148 | 130
Fair Value, Measurements, Recurring [Member] | 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, Fair Value Disclosure | 75,723 | 83,217
Other Assets, Fair Value Disclosure | 11,150 | 8,778
Total assets | 159,285 | 173,108
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 2,248
Total liabilities | 131,312 | 119,938
Fair Value, Measurements, Recurring [Member] | 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 | 0 | 2,523
Fair Value, Measurements, Recurring [Member] | 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 | 72,412 | 78,590
Derivative Liability | 131,312 | 117,690
Fair Value, Measurements, Recurring [Member] | 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
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Inventory, Current, Fair Value Disclosure | 1,227,368 | 921,554
Deferred Compensation Assets, Fair Value Disclosure | 0 | 0
Other Assets, Fair Value Disclosure | 0 | 0
Total assets | 1,759,980 | 1,444,374
Foreign Currency Contracts, Liability, Fair Value Disclosure | 22,887 | 0
Total liabilities | 397,860 | 480,052
Fair Value, Measurements, Recurring [Member] | 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 | 16,783 | 0
Fair Value, Measurements, Recurring [Member] | 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 | 501,180 | 518,620
Derivative Liability | 368,825 | 479,922
Fair Value, Measurements, Recurring [Member] | 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 | 14,649 | 4,200
Derivative Liability | 6,148 | 130
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Inventory, Current, Fair Value Disclosure | 0 | 0
Deferred Compensation Assets, Fair Value Disclosure | 0 | 0
Other Assets, Fair Value Disclosure | 0 | 0
Total assets | 0 | 0
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0 | 0
Total liabilities | 109,220 | 114,917
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [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 | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | 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
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | 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
NCRA [Member] | Fair Value, Measurements, Recurring [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
NCRA [Member] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [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] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [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 | 109,220 | $ 114,917
National Cooperative Refinery Association [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 | $ 109,220 |

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