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Debt (Schedule of Financial Covenants) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Debt Instrument [Line Items] |
Percentage Of Net Income Added To Base Net Worth Compliance Limit | 50.00%gpre_PercentageOfNetIncomeAddedToBaseNetWorthComplianceLimit
Green Plains Fairmont and Green Plains Wood River [Member] |
Debt Instrument [Line Items] |
Annual Leverage Ratio | 3.25
Debt service coverage ratio | 2.25 gpre_DebtServiceCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember
Annual capital expenditures | 2.0 gpre_AnnualCapitalExpendituresMaximum / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember
Annual Capital Maintenance Expenditures Maximum | 4.0 gpre_AnnualCapitalMaintenanceExpendituresMaximum / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember
Green Plains Fairmont and Green Plains Wood River [Member] | Future Covenant [Member] |
Debt Instrument [Line Items] |
Annual Leverage Ratio | 2.00
Green Plains Holdings II [Member] |
Debt Instrument [Line Items] |
Working capital | 15.0 gpre_MinimumWorkingCapitalRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember
Net worth | 100.0 us-gaap_MinimumNetWorthRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember
Percentage Of Net Income Added To Base Net Worth Compliance Limit | 25.00%gpre_PercentageOfNetIncomeAddedToBaseNetWorthComplianceLimit / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember
Debt service coverage ratio | 1.25 gpre_DebtServiceCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember
Green Plains Obion [Member] |
Debt Instrument [Line Items] |
Working capital | 9.0 gpre_MinimumWorkingCapitalRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsObionMember
Net worth | 95.0 us-gaap_MinimumNetWorthRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsObionMember
Percentage Of Net Income Added To Base Net Worth Compliance Limit | 25.00%gpre_PercentageOfNetIncomeAddedToBaseNetWorthComplianceLimit / dei_LegalEntityAxis = gpre_GreenPlainsObionMember
Debt service coverage ratio | 1.25 gpre_DebtServiceCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsObionMember
Green Plains Processing [Member] |
Debt Instrument [Line Items] |
Fixed charge coverage ratio | 1.25 gpre_FixedChargeCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsProcessingMember
Annual Leverage Ratio | 4.00
Green Plains Processing [Member] | Future Covenant [Member] |
Debt Instrument [Line Items] |
Annual Leverage Ratio | 3.25
Green Plains Superior [Member] |
Debt Instrument [Line Items] |
Working capital | 3.0 gpre_MinimumWorkingCapitalRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember
Net worth | 33.0 us-gaap_MinimumNetWorthRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember
Debt service coverage ratio | 1.0 gpre_DebtServiceCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember
Green Plains Grain [Member] |
Debt Instrument [Line Items] |
Working capital | 23.0 gpre_MinimumWorkingCapitalRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember
Net worth | 26.3 us-gaap_MinimumNetWorthRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember
Fixed charge coverage ratio | 1.25 gpre_FixedChargeCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember
Annual Leverage Ratio | 6.00
Annual capital expenditures | 15.0 gpre_AnnualCapitalExpendituresMaximum / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember

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- Definition Annual Capital Expenditures, Maximum + References No definition available. + Details
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- Definition Maximum amount of annual capital maintenance expenditures. + References No definition available. + Details
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Namespace Prefix: | gpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Annual leverage ratio + References No definition available. + Details
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Period Type: | instant

X
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The lowest amount of net worth (total assets minus total liabilities) required by secondary market investors or state-imposed regulatory mandates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(a) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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Balance Type: | credit
Period Type: | instant

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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |

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- Details
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