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Investments - Narrative (Details) T in Millions |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 01, 2016 USD ($) | May 31, 2016 USD ($) T Tons | Nov. 30, 2015 USD ($) | May 31, 2015 USD ($) | Nov. 30, 2014 USD ($) | May 31, 2016 USD ($) T Tons | May 31, 2015 USD ($) | Feb. 01, 2096 USD ($) | Sep. 30, 2015 | Aug. 31, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Payments for Repurchase of Redeemable Noncontrolling Interest |  |  |  |  |  | $ (153,022,000) | $ (65,981,000) |  |  |
Equity (income) loss from investments |  | $ (72,453,000) |  | $ (34,750,000) |  | (131,819,000) | (83,548,000) |  |  |
Short-term investments, net |  |  |  |  | $ 315,000,000 | 300,000 | 170,000,000 |  |  |
Short-term Investments |  | $ 0 |  |  |  | $ 0 |  |  |  |
CF Nitrogen LLC [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Equity Method Investments | $ 2,800,000,000 |  |  |  |  |  |  |  |  |
Ownership percentage | 11.40% |  |  |  |  |  |  |  |  |
Supply agreement, term | 80 years |  |  |  |  |  |  |  |  |
Maximum annual granular urea eligible for purchase | T |  | 1.1 |  |  |  | 1.1 |  |  |  |
Maximum annual UAN eligible for purchase | Tons |  | 580,000 |  |  |  | 580,000 |  |  |  |
Cargill, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership of joint venture partner |  | 50.00% |  |  |  | 50.00% |  |  |  |
Crack Spread Contingent Payment [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Business, Contingent Consideration Paid |  |  | $ 2,600,000 |  |  |  |  |  |  |
Energy [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity (income) loss from investments |  | $ (1,300,000) |  | (364,000) |  | $ (3,487,000) | (1,440,000) |  |  |
Energy [Member] | National Cooperative Refinery Association [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  |  |  |  | 100.00% | 88.90%
Payments for Repurchase of Redeemable Noncontrolling Interest |  |  |  |  |  | (153,000,000) | (66,000,000) |  |  |
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interest |  | 24,661,000 |  |  |  | 24,661,000 |  |  |  |
Nitrogen Production [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity (income) loss from investments |  | (41,257,000) |  | 0 |  | (53,112,000) | 0 |  |  |
Nitrogen Production [Member] | CF Nitrogen LLC [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  | 2,900,000,000 |  |  |  | 2,900,000,000 |  |  |  |
Corporate and Other |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity (income) loss from investments |  | $ (23,965,000) |  | (26,422,000) |  | $ (67,068,000) | (69,681,000) |  |  |
Corporate and Other | Ardent Mills [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 12.00% |  |  |  | 12.00% |  |  |  |
Board seats held by CHS |  | 1 |  |  |  | 1 |  |  |  |
Board seats of equity method investment |  | 5 |  |  |  | 5 |  |  |  |
Equity Method Investments |  | $ 196,000,000 |  |  |  | $ 196,000,000 |  |  |  |
Number of parent companies |  | 3 |  |  |  | 3 |  |  |  |
Corporate and Other | Ventura Foods, LLC |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |  | 50.00% |  |  |  |
Equity Method Investments |  | $ 363,000,000 |  |  |  | $ 363,000,000 |  |  |  |
Equity value exceeding carrying value |  | 12,900,000 |  |  |  | 12,900,000 |  |  |  |
Ag [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity (income) loss from investments |  | $ (5,931,000) |  | $ (7,964,000) |  | $ (8,152,000) | $ (12,427,000) |  |  |
Ag [Member] | TEMCO, LLC |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% |  |  |  | 50.00% |  |  |  |
Equity Method Investments |  | $ 47,500,000 |  |  |  | $ 47,500,000 |  |  |  |
Scenario, Forecast [Member] | Nitrogen Production [Member] | CF Nitrogen LLC [Member] |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  | $ 0 |  |

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