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Fair Value Measurements (Tables) | 9 Months Ended
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May 31, 2019
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring |
| May 31, 2019
| 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 | $ | 27,024 |  |  | $ | 229,760 |  |  | $ | — |  |  | $ | 256,784 |
Foreign exchange derivatives | — |  |  | 9,704 |  |  | — |  |  | 9,704 |
Interest rate swap derivatives | — |  |  | 4,479 |  |  | — |  |  | 4,479 |
Deferred compensation assets | 39,327 |  |  | — |  |  | — |  |  | 39,327 |
Embedded derivative asset | — |  |  | 20,957 |  |  | — |  |  | 20,957 |
Other assets | 5,763 |  |  | — |  |  | — |  |  | 5,763 |
Total | $ | 72,114 |  |  | $ | 264,900 |  |  | $ | — |  |  | $ | 337,014 |
Liabilities: |  |  |  |  |  |  |  |  |  |
Commodity derivatives | $ | 76,388 |  |  | $ | 239,066 |  |  | $ | — |  |  | $ | 315,454 |
Foreign exchange derivatives | — |  |  | 7,480 |  |  | — |  |  | 7,480 |
Interest rate swap derivatives | — |  |  | 713 |  |  | — |  |  | 713 |
Total | $ | 76,388 |  |  | $ | 247,259 |  |  | $ | — |  |  | $ | 323,647 |
| August 31, 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 exchange 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 exchange derivatives | — |  |  | 24,701 |  |  | — |  |  | 24,701 |
Interest rate swap derivatives | — |  |  | 9,452 |  |  | — |  |  | 9,452 |
Total | $ | 31,778 |  |  | $ | 424,064 |  |  | $ | — |  |  | $ | 455,842 |

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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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