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Derivative Financial Instruments and Hedging Activities Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2017 | Nov. 30, 2016 | Feb. 28, 2018 | Aug. 31, 2017
Derivative [Line Items] |  |  |  |
Derivative Asset, Noncurrent |  |  | $ 23,100 | $ 186,900
Derivative Liability, Noncurrent |  |  | 8,200 | 13,700
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  | 420,182 | 380,236
Derivative Assets |  |  | 452,708 | 418,952
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  | 32,526 | 38,716
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  | 317,196 | 287,079
Derivative Liabilities |  |  | 380,615 | 329,693
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  |  | 30,893 | 3,898
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  | $ 32,526 | 38,716
Credit Rating Agencies Threshold, Minimum |  |  | 66.67% |
CF Nitrogen LLC [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Annual Payment Receivable Contingent On Investment Credit Rating |  |  | $ 5,000 |
Payments For Credit Rating Decrease In Investment | $ 5,000 | $ 5,000 |  |
Embedded derivative asset |  |  | 22,700 |
Embedded Derivative, Gain on Embedded Derivative |  | $ 24,100 |  |
Foreign currency derivatives | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  | 2,901 | 5,135
Derivative Assets |  |  | 6,026 | 8,771
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  | 3,125 | 3,636
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  | 9,781 | 16,295
Derivative Liabilities |  |  | 12,906 | 19,931
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  |  | 0 | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  | 3,125 | 3,636
Derivative Asset, Notional Amount |  |  | 723,200 | 776,700
Interest rate swap derivatives | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  | 1 |
Derivative Liabilities |  |  | 1 |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  |  | 0 |
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  | 0 |
Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  | 22,704 | 25,533
Derivative Assets |  |  | 22,704 | 25,533
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  | 0 | 0
Commodity and freight derivatives | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  | 394,577 | 349,568
Derivative Assets |  |  | 423,978 | 384,648
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  | 29,401 | 35,080
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  | 307,414 | 270,784
Derivative Liabilities |  |  | 367,708 | 309,762
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  |  | 30,893 | 3,898
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  | 29,401 | $ 35,080
Fair Value Hedging [Member] | Interest rate swap derivatives | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Asset, Notional Amount |  |  | $ 495,000 |

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