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Fair Value Measurements - Fair Value Measurements (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Nov. 30, 2012 | Aug. 31, 2012 | Nov. 30, 2011
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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 | 2,826 | 957 |
Other assets | 75,873 | 75,000 | 69,271
Total assets | 125,953 | 146,543 | 217,186
Foreign currency derivatives | 2,077 | 2,366 |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  |
Total liabilities | 19,383 | 152,415 | 18,583
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 | 47,254 | 70,586 | 147,915
Derivative liabilities | 17,306 | 150,049 | 18,583
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swap derivatives |  |  |
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 | 2,186,328 | 1,702,757 | 1,423,083
Foreign Currency Contract, Asset, Fair Value Disclosure |  |  |
Other assets |  |  |
Total assets | 2,527,715 | 2,481,119 | 1,677,489
Foreign currency derivatives |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |  |
Total liabilities | 261,493 | 356,590 | 282,854
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 | 341,387 | 778,362 | 254,406
Derivative liabilities | 261,010 | 356,046 | 282,259
Significant Other Observable Inputs (Level 2) | Interest rate swap derivatives |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities | 483 | 544 | 595
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 | 170,621 | 127,516 | 105,188
Total liabilities | 170,621 | 127,516 | 105,188
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 derivatives |  |  |
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 | 2,186,328 | 1,702,757 | 1,423,083
Foreign Currency Contract, Asset, Fair Value Disclosure | 2,826 | 957 |
Other assets | 75,873 | 75,000 | 69,271
Total assets | 2,653,668 | 2,627,662 | 1,894,675
Foreign currency derivatives | 2,077 | 2,366 |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 170,621 | 127,516 | 105,188
Total liabilities | 451,497 | 636,521 | 406,625
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 | 388,641 | 848,948 | 402,321
Derivative liabilities | 278,316 | 506,095 | 300,842
Estimate of Fair Value, Fair Value Disclosure [Member] | Interest rate swap derivatives |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative liabilities | $ 483 | $ 544 | $ 595

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