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Derivative Financial Instruments and Hedging Activities Derivatives (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Nov. 30, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2016
Purchase and Sales Contracts [Line Items] |  |  |  |
Credit Rating Agencies Threshold, Minimum | 66.67% |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 389,329,000 |  |  | $ 510,945,000
Derivative Asset, Fair Value, Gross Asset | 419,103,000 |  |  | 543,821,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 29,774,000 |  |  | 32,876,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 287,494,000 |  |  | 479,912,000
Derivative Liability, Fair Value, Gross Liability | 317,505,000 |  |  | 513,599,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 237,000 |  |  | 811,000
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 29,774,000 |  |  | 32,876,000
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net | 0 |  |  |
CF Nitrogen LLC [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Annual Payment Receivable Contingent On Investment Credit Rating | 5,000,000 |  |  |
Payments For Credit Rating Decrease In Investment | 5,000,000 |  |  |
Embedded derivative asset | 24,100,000 |  |  |
Gain (Loss) on Investments | 5,000,000 |  |  |
Embedded Derivative, Gain on Embedded Derivative | 24,100,000 |  |  |
Foreign currency derivatives | Not Designated as Hedging Instrument [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 15,065,000 |  |  | 12,364,000
Derivative Asset, Fair Value, Gross Asset | 20,335,000 |  |  | 21,551,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 5,270,000 |  |  | 9,187,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 10,420,000 |  |  | 13,102,000
Derivative Liability, Fair Value, Gross Liability | 15,690,000 |  |  | 22,289,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 5,270,000 |  |  | 9,187,000
Derivative Asset, Notional Amount | 789,100,000 |  |  | 802,200,000
Interest rate swap derivatives | Designated as Hedging Instrument [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 10,444,000 |  |  | 22,078,000
Derivative Asset, Fair Value, Gross Asset | 10,444,000 |  |  | 22,078,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  | 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 1,642,000 |  |  |
Derivative Liability, Fair Value, Gross Liability | 1,642,000 |  |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  |
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  |
Interest rate swap derivatives | Not Designated as Hedging Instrument [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 6,000 |  |  | 8,000
Derivative Liability, Fair Value, Gross Liability | 6,000 |  |  | 8,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  | 0
Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 24,106,000 |  |  |
Derivative Asset, Fair Value, Gross Asset | 24,106,000 |  |  |
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  |
Commodity and freight derivatives | Not Designated as Hedging Instrument [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 339,714,000 |  |  | 476,503,000
Derivative Asset, Fair Value, Gross Asset | 364,218,000 |  |  | 500,192,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 24,504,000 |  |  | 23,689,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 275,426,000 |  |  | 466,802,000
Derivative Liability, Fair Value, Gross Liability | 300,167,000 |  |  | 491,302,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 237,000 |  |  | 811,000
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 24,504,000 |  |  | 23,689,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge | 13,300,000 |  | $ 2,300,000 |
Fair Value Hedging [Member] | Interest rate swap derivatives | Designated as Hedging Instrument [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Derivative Asset, Notional Amount | 495,000,000 |  |  |
Cash Flow Hedging [Member] | Interest rate swap derivatives | Designated as Hedging Instrument [Member] |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |
Derivative Asset, Notional Amount |  |  |  | $ 300,000,000
Cash paid to settle derivative | $ 5,100,000 | $ 5,300,000 | $ 6,400,000 |
Derivatives settled, number | 2 | 2 | 2 |

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