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Fair Value Measurements - Fair Value Measurements (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified | Aug. 31, 2012 | Aug. 31, 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 derivatives | 957 | 1,508
Other assets | 75,000 | 68,246
Total assets | 146,543 | 154,836
Foreign currency derivatives | 2,366 |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |
Total liabilities | 152,415 | 191,607
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 | 70,586 | 85,082
Derivative liabilities | 150,049 | 191,607
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 | 1,702,757 | 1,288,049
Foreign currency derivatives |  |
Other assets |  |
Total assets | 2,481,119 | 1,837,105
Foreign currency derivatives |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  |
Total liabilities | 356,590 | 291,006
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 | 778,362 | 549,056
Derivative liabilities | 356,046 | 290,256
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 | 544 | 750
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 | 127,516 |
Total liabilities | 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, 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 | 1,702,757 | 1,288,049
Foreign currency derivatives | 957 | 1,508
Other assets | 75,000 | 68,246
Total assets | 2,627,662 | 1,991,941
Foreign currency derivatives | 2,366 |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest | 127,516 |
Total liabilities | 636,521 | 482,613
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 | 848,948 | 634,138
Derivative liabilities | 506,095 | 481,863
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 | $ 544 | $ 750

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