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Debt (Schedule of Allowable Dividends) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Green Plains Holdings II [Member] |
Debt Instrument [Line Items] |
Allowable dividends as percentage of net profit before tax | 40.00%gpre_AllowableDividendsAsPercentageOfNetProfitBeforeTax / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember
Working Capital Threshold For Unlimited Dividend Distributions | $ 20.0 gpre_WorkingCapitalThresholdForUnlimitedDividendDistributions / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember
Green Plains Obion [Member] |
Debt Instrument [Line Items] |
Allowable dividends as percentage of net profit before tax | 40.00%gpre_AllowableDividendsAsPercentageOfNetProfitBeforeTax / dei_LegalEntityAxis = gpre_GreenPlainsObionMember
Working Capital Threshold For Unlimited Dividend Distributions | $ 15.0 gpre_WorkingCapitalThresholdForUnlimitedDividendDistributions / dei_LegalEntityAxis = gpre_GreenPlainsObionMember
Green Plains Superior [Member] |
Debt Instrument [Line Items] |
Allowable dividends as percentage of net profit before tax | 40.00%gpre_AllowableDividendsAsPercentageOfNetProfitBeforeTax / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember

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