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Goodwill (Details)	Aug. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill impairment	$ 0
Coffeyville Resources Nitrogen Fertilizers LLC
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	12.00%

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Amount after tax of loss recognized that results from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of fair value of reporting unit in excess of carrying amount.

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