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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 01, 2016 USD ($) | Aug. 31, 2015 USD ($) Refineries | Aug. 31, 2015 USD ($) Refineries | Aug. 31, 2014 USD ($) | Aug. 31, 2013 USD ($) | Sep. 30, 2015 | Nov. 29, 2011
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Income taxes |  |  | $ (12,165) | $ 48,296 | $ 89,666 |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |  |  |
Number of Refineries | Refineries |  | 2 | 2 |  |  |  |
Minimum | Subsidiaries |  |  |  |  |  |  |
Income Taxes [Abstract] |  |  |  |  |  |  |
Subsidiaries Ownership Percentage |  |  | 80.00% |  |  |  |
Minimum | Other Intangible Assets [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 2 years |  |  |  |
Minimum | Major Maintenance Activities Requiring Shutdown |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 2 years |  |  |  |
Minimum | Land and Land Improvements |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 15 years |  |  |  |
Minimum | Building |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 20 years |  |  |  |
Minimum | Machinery, Equipment, Office and Other |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 5 years |  |  |  |
Minimum | Property, Plant and Equipment, Other Types [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 3 years |  |  |  |
Maximum | Other Intangible Assets [Member] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 30 years |  |  |  |
Maximum | Major Maintenance Activities Requiring Shutdown |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 4 years |  |  |  |
Maximum | Land and Land Improvements |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 20 years |  |  |  |
Maximum | Building |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 40 years |  |  |  |
Maximum | Machinery, Equipment, Office and Other |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 20 years |  |  |  |
Maximum | Property, Plant and Equipment, Other Types [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  | 10 years |  |  |  |
National Cooperative Refinery Association |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  | 88.90% | 88.90% |  |  |  | 74.40%
Subsequent Event [Member] | National Cooperative Refinery Association |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  | 100.00% |
Application Of Leases And Lease Arrangements [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Income taxes |  | $ 16,000 |  |  |  |  |
Scenario, Forecast [Member] | CF Nitrogen LLC [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Supply agreement, term | 80 years |  |  |  |  |  |
Payments to Acquire Equity Method Investments | $ 2,800,000 |  |  |  |  |  |
Equity Method Investment, Ownership Percentage | 11.40% |  |  |  |  |  |

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