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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Feb. 28, 2018 | Aug. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | $ 53,041 | $ 52,414
Deferred purchase price receivable | 517,759 | 548,602
Embedded derivative asset | 22,704 | 25,533
Other assets | 17,342 | 14,846
Total assets | 1,040,850 | 1,044,792
Foreign currency derivatives |  | 19,931
Total liabilities | 389,231 | 330,400
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | 53,041 | 52,414
Deferred purchase price receivable | 0 | 0
Embedded derivative asset | 0 | 0
Other assets | 17,342 | 14,846
Total assets | 96,385 | 115,751
Foreign currency derivatives |  | 0
Total liabilities | 55,696 | 31,189
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | 0 | 0
Deferred purchase price receivable | 0 | 0
Embedded derivative asset | 22,704 | 25,533
Other assets | 0 | 0
Total assets | 426,706 | 380,439
Foreign currency derivatives |  | 19,931
Total liabilities | 333,535 | 299,211
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | 0 | 0
Deferred purchase price receivable | 517,759 | 548,602
Embedded derivative asset | 0 | 0
Other assets | 0 | 0
Total assets | 517,759 | 548,602
Foreign currency derivatives |  | 0
Total liabilities | 0 | 0
Commodity and freight derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 423,978 | 384,648
Derivative Liability | 367,708 | 309,762
Commodity and freight derivatives | 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 | 26,002 | 48,491
Derivative Liability | 55,696 | 31,189
Commodity and freight derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 397,976 | 336,157
Derivative Liability | 312,012 | 278,573
Commodity and freight derivatives | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 0 | 0
Derivative Liability | 0 | 0
Foreign currency derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency derivatives | 6,026 | 8,771
Foreign currency derivatives | 12,906 |
Foreign currency derivatives | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency derivatives | 0 | 0
Foreign currency derivatives | 0 |
Foreign currency derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency derivatives | 6,026 | 8,771
Foreign currency derivatives | 12,906 |
Foreign currency derivatives | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign currency derivatives | 0 | 0
Foreign currency derivatives | 0 |
Interest rate swap derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset |  | 9,978
Derivative Liability | 8,617 | 707
Interest rate swap derivatives | 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 |  | 0
Derivative Liability | 0 | 0
Interest rate swap derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset |  | 9,978
Derivative Liability | 8,617 | 707
Interest rate swap derivatives | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset |  | 0
Derivative Liability | $ 0 | $ 0

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