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Fair Value Measurements - Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | May 31, 2014 | Aug. 31, 2013 | May 31, 2013
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 544,382 | $ 499,890 | $ 524,461
Derivative Liability, Fair Value, Gross Liability | 412,471 | 465,066 | 456,476
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 | 0
Other Assets, Fair Value Disclosure | 89,848 | 114,084 | 131,901
Total assets | 176,669 | 179,419 | 190,319
Total liabilities | 81,437 | 65,109 | 99,880
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 | 1,159,581 | 1,203,383 | 1,433,639
Other Assets, Fair Value Disclosure | 0 | 0 | 0
Total assets | 1,617,142 | 1,637,940 | 1,899,682
Total liabilities | 331,034 | 399,958 | 356,596
Fair Value, Measurements, Recurring [Member] | 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 | 0
Other Assets, Fair Value Disclosure | 0 | 0 | 0
Total assets | 0 | 0 | 0
Total liabilities | 130,159 | 134,134 | 146,245
Fair Value, Measurements, Recurring [Member] | 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 | 1,159,581 | 1,203,383 | 1,433,639
Other Assets, Fair Value Disclosure | 89,848 | 114,084 | 131,901
Total assets | 1,793,811 | 1,817,359 | 2,090,001
Total liabilities | 542,630 | 599,201 | 602,721
Foreign Exchange Contract [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 182 | 7,079 | 5,043
Derivative Liability, Fair Value, Gross Liability | 2,153 | 5,925 | 3,883
Foreign Exchange Contract [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] |  |  |
Derivative Asset, Fair Value, Gross Asset | 182 | 6,894 | 5,043
Derivative Liability, Fair Value, Gross Liability | 2,153 | 5,925 | 3,883
Foreign Exchange Contract [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] |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 185 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0 | 0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0 | 0
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 182 | 7,079 | 5,043
Derivative Liability, Fair Value, Gross Liability | 2,153 | 5,925 | 3,883
Commodity and Freight Derivatives [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 544,198 | 468,673 | 510,258
Derivative Liability, Fair Value, Gross Liability | 410,148 | 458,893 | 452,289
Commodity and Freight Derivatives [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] |  |  |
Derivative Asset, Fair Value, Gross Asset | 86,639 | 58,441 | 53,375
Derivative Liability, Fair Value, Gross Liability | 79,284 | 59,184 | 95,997
Commodity and Freight Derivatives [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] |  |  |
Derivative Asset, Fair Value, Gross Asset | 457,559 | 410,233 | 456,883
Derivative Liability, Fair Value, Gross Liability | 330,864 | 399,710 | 356,292
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0 | 0
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 544,198 | 468,674 | 510,258
Derivative Liability, Fair Value, Gross Liability | 410,148 | 458,894 | 452,289
Interest Rate Swap [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] |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0 | 0
Interest Rate Swap [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] |  |  |
Derivative Asset, Fair Value, Gross Asset | 2 | 24,139 | 9,160
Derivative Liability, Fair Value, Gross Liability | 170 | 248 | 304
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 0 | 0 | 0
Derivative Liability, Fair Value, Gross Liability | 0 | 0 | 0
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset | 2 | 24,139 | 9,160
Derivative Liability, Fair Value, Gross Liability | 170 | 248 | 304
National Cooperative Refinery Association [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 | 0
National Cooperative Refinery Association [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 | 0
National Cooperative Refinery Association [Member] | Fair Value, Measurements, Recurring [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 | 130,159 | 134,134 | 146,245
National Cooperative Refinery Association [Member] | Fair Value, Measurements, Recurring [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 |  | $ 134,134 | $ 146,245

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