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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | May 31, 2019 | Aug. 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | $ 39,327 | $ 39,073
Embedded derivative asset | 20,957 | 23,595
Other assets | 5,763 | 5,334
Total assets | 337,014 | 397,249
Foreign exchange derivatives |  | 24,701
Total liabilities | 323,647 | 455,842
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 | 39,327 | 39,073
Embedded derivative asset | 0 | 0
Other assets | 5,763 | 5,334
Total assets | 72,114 | 98,894
Foreign exchange derivatives |  | 0
Total liabilities | 76,388 | 31,778
Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | 0 | 0
Embedded derivative asset | 20,957 | 23,595
Other assets | 0 | 0
Total assets | 264,900 | 298,355
Foreign exchange derivatives |  | 24,701
Total liabilities | 247,259 | 424,064
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Deferred compensation assets | 0 | 0
Embedded derivative asset | 0 | 0
Other assets | 0 | 0
Total assets | 0 | 0
Foreign exchange derivatives |  | 0
Total liabilities | 0 | 0
Commodity derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 256,784 | 313,846
Derivative Liability | 315,454 | 421,689
Commodity 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 | 27,024 | 54,487
Derivative Liability | 76,388 | 31,778
Commodity derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 229,760 | 259,359
Derivative Liability | 239,066 | 389,911
Commodity 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 exchange derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign exchange derivatives | 9,704 | 15,401
Foreign exchange derivatives | 7,480 |
Foreign exchange 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 exchange derivatives | 0 | 0
Foreign exchange derivatives | 0 |
Foreign exchange derivatives | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign exchange derivatives | 9,704 | 15,401
Foreign exchange derivatives | 7,480 |
Foreign exchange derivatives | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Foreign exchange derivatives | 0 | 0
Foreign exchange derivatives | 0 |
Interest rate swap derivatives |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Asset | 4,479 |
Derivative Liability | 713 | 9,452
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 | 4,479 |
Derivative Liability | 713 | 9,452
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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