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Derivative Financial Instruments and Hedging Activities - Derivatives (Details) $ in Thousands, bbl in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2018 USD ($) bbl | Aug. 31, 2018 USD ($) bbl
Derivative [Line Items] |  |
Derivative Asset, Noncurrent | $ 18,700 | $ 23,100
Derivative Liability, Noncurrent | 16,100 | 7,900
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 172,660 | 316,545
Derivative Assets | 212,335 | 352,029
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 39,675 | 35,484
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 223,574 | 397,288
Derivative Liabilities | 286,370 | 445,755
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 23,121 | 12,983
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | $ 39,675 | 35,484
Credit Rating Agencies Threshold, Minimum | 66.67% |
CF Nitrogen LLC [Member] |  |
Derivative [Line Items] |  |
Annual Payment Receivable Contingent On Investment Credit Rating | $ 5,000 |
Embedded derivative asset | 20,100 |
Foreign currency derivatives | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 9,296 | 6,698
Derivative Assets | 15,877 | 15,401
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 6,581 | 8,703
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 2,890 | 15,998
Derivative Liabilities | 9,471 | 24,701
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 6,581 | 8,703
Derivative Asset, Notional Amount | 762,400 | 988,800
Interest rate swap derivatives | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative Liabilities | 10,407 | 9,452
Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 20,166 | 23,595
Derivative Assets | 20,166 | 23,595
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 | 0
Commodity derivatives | Not Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 143,198 | 286,252
Derivative Assets | 176,292 | 313,033
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 33,094 | 26,781
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 220,684 | 381,290
Derivative Liabilities | 276,899 | 421,054
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 23,121 | 12,983
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 33,094 | $ 26,781
Fair Value Hedging | Interest rate swap derivatives | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative Asset, Notional Amount | $ 495,000 |
Cash Flow Hedging |  |
Derivative [Line Items] |  |
Aggregate notional amount of cash flow hedges (in barrels) | bbl | 5.4 | 1.1
Cash Flow Hedging | Designated as Hedging Instrument |  |
Derivative [Line Items] |  |
Derivative Assets | $ 9,336 | $ 812
Derivative Liabilities | $ 11,622 | $ 634

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