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Derivative Financial Instruments and Hedging Activities Derivatives (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Feb. 28, 2017 | Nov. 30, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Feb. 28, 2017 | Feb. 29, 2016 | 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 | $ 376,993,000 |  |  |  |  | $ 376,993,000 |  | $ 510,945,000
Derivative Asset, Fair Value, Gross Asset, Current | 386,613,000 |  |  |  |  | 386,613,000 |  |
Derivative Asset, Not offset, Policy election deduction, Current | 30,160,000 |  |  |  |  | 30,160,000 |  |
Derivative Asset, Fair Value, Amount not offset against collateral, Current | 356,453,000 |  |  |  |  | 356,453,000 |  |
Derivative Asset, Fair Value, Gross Asset | 407,153,000 |  |  |  |  | 407,153,000 |  | 543,821,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 30,160,000 |  |  |  |  | 30,160,000 |  | 32,876,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 245,244,000 |  |  |  |  | 245,244,000 |  | 479,912,000
Derivative Liability, Fair Value, Gross Liability | 275,484,000 |  |  |  |  | 275,484,000 |  | 513,599,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 80,000 |  |  |  |  | 80,000 |  | 811,000
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 30,160,000 |  |  |  |  | 30,160,000 |  | 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 | 24,600,000 | 24,100,000 |  |  |  | 24,600,000 |  |
Embedded Derivative, Gain on Embedded Derivative | 500,000 | $ 29,100,000 |  |  |  |  |  |
Foreign currency derivatives | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 17,231,000 |  |  |  |  | 17,231,000 |  | 12,364,000
Derivative Asset, Fair Value, Gross Asset | 27,548,000 |  |  |  |  | 27,548,000 |  | 21,551,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 10,317,000 |  |  |  |  | 10,317,000 |  | 9,187,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 8,220,000 |  |  |  |  | 8,220,000 |  | 13,102,000
Derivative Liability, Fair Value, Gross Liability | 18,537,000 |  |  |  |  | 18,537,000 |  | 22,289,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  |  |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 10,317,000 |  |  |  |  | 10,317,000 |  | 9,187,000
Derivative Asset, Notional Amount | 903,400,000 |  |  |  |  | 903,400,000 |  | 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 | 6,892,000 |  |  |  |  | 6,892,000 |  | 22,078,000
Derivative Asset, Fair Value, Gross Asset | 6,892,000 |  |  |  |  | 6,892,000 |  | 22,078,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  |  |  | 0 |  | 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 2,327,000 |  |  |  |  | 2,327,000 |  |
Derivative Liability, Fair Value, Gross Liability | 2,327,000 |  |  |  |  | 2,327,000 |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  |  |  | 0 |  |
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  |  |  | 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 | 2,000 |  |  |  |  | 2,000 |  | 8,000
Derivative Liability, Fair Value, Gross Liability | 2,000 |  |  |  |  | 2,000 |  | 8,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  |  |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  |  |  | 0 |  | 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 | 328,301,000 |  |  |  |  | 328,301,000 |  | 476,503,000
Derivative Asset, Fair Value, Gross Asset | 348,144,000 |  |  |  |  | 348,144,000 |  | 500,192,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 19,843,000 |  |  |  |  | 19,843,000 |  | 23,689,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 234,695,000 |  |  |  |  | 234,695,000 |  | 466,802,000
Derivative Liability, Fair Value, Gross Liability | 254,618,000 |  |  |  |  | 254,618,000 |  | 491,302,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 80,000 |  |  |  |  | 80,000 |  | 811,000
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 19,843,000 |  |  |  |  | 19,843,000 |  | 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 |  |  |  |  |  | 17,500,000 | $ 11,500,000 |
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 |  |  |  |  | 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 |  |  |
Derivatives [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset, Current | 4,029,000 |  |  |  |  | 4,029,000 |  |
Derivative Asset, Not offset, Policy election deduction, Current | 0 |  |  |  |  | 0 |  |
Derivative Asset, Fair Value, Amount not offset against collateral, Current | 4,029,000 |  |  |  |  | 4,029,000 |  |
Other Assets [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |  |  |
Derivative Asset, Fair Value, Gross Asset, Non-current | 20,540,000 |  |  |  |  | 20,540,000 |  |
Derivative Asset, Not offset, Policy election deduction, Non-current | 0 |  |  |  |  | 0 |  |
Derivative Asset, Fair Value, Amount not offset against collateral, Non-current | $ 20,540,000 |  |  |  |  | $ 20,540,000 |  |

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