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Fair Value Measurements (Tables) | 12 Months Ended
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Aug. 31, 2018
Fair Value Disclosures [Abstract] |
Schedule of assets and liabilities recognized at fair value on a recurring basis | The following tables present assets and liabilities, included on our Consolidated Balance Sheets, that are recognized at fair value on a recurring basis, and indicate the fair value hierarchy utilized to determine these fair values. Assets and liabilities are classified, in their entirety, based on the lowest level of input that is a significant component of the fair value measurement. The lowest level of input is considered Level 3. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the classification of fair value assets and liabilities within the fair value hierarchy levels. Recurring fair value measurements at August 31, 2018, and 2017, are as follows:
| 2018
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | 54,487 |  |  | $ | 259,359 |  |  | $ | — |  |  | $ | 313,846 |
Foreign currency derivatives | — |  |  | 15,401 |  |  | — |  |  | 15,401 |
Deferred compensation assets | 39,073 |  |  | — |  |  | — |  |  | 39,073 |
Embedded derivative asset | — |  |  | 23,595 |  |  | — |  |  | 23,595 |
Other assets | 5,334 |  |  | — |  |  | — |  |  | 5,334 |
Total | $ | 98,894 |  |  | $ | 298,355 |  |  | $ | — |  |  | $ | 397,249 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | 31,778 |  |  | $ | 389,911 |  |  | $ | — |  |  | $ | 421,689 |
Foreign currency derivatives | — |  |  | 24,701 |  |  | — |  |  | 24,701 |
Interest rate swap derivatives | — |  |  | 9,452 |  |  | — |  |  | 9,452 |
Total | $ | 31,778 |  |  | $ | 424,064 |  |  | $ | — |  |  | $ | 455,842 |
| 2017 (As Restated)
| Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total
| (Dollars in thousands)
Assets: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | 48,483 |  |  | $ | 166,866 |  |  | $ | — |  |  | $ | 215,349 |
Foreign currency derivatives | — |  |  | 8,779 |  |  | — |  |  | 8,779 |
Interest rate swap derivatives | — |  |  | 9,978 |  |  | — |  |  | 9,978 |
Deferred compensation assets | 52,414 |  |  | — |  |  | — |  |  | 52,414 |
Deferred purchase price receivable | — |  |  | — |  |  | 548,602 |  |  | 548,602 |
Embedded derivative | — |  |  | 25,533 |  |  | — |  |  | 25,533 |
Other assets | 14,846 |  |  | — |  |  | — |  |  | 14,846 |
Total | $ | 115,743 |  |  | $ | 211,156 |  |  | $ | 548,602 |  |  | $ | 875,501 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | 31,190 |  |  | $ | 262,140 |  |  | $ | — |  |  | $ | 293,330 |
Foreign currency derivatives | — |  |  | 19,931 |  |  | — |  |  | 19,931 |
Interest rate swap derivatives | — |  |  | 707 |  |  | — |  |  | 707 |
Total | $ | 31,190 |  |  | $ | 282,778 |  |  | $ | — |  |  | $ | 313,968 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=99377789&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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