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Debt (Schedule of Financial Covenants) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	2.25gpre_DebtServiceCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember
Annual capital expenditures	2.0gpre_AnnualCapitalExpendituresMaximum / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember
Annual Capital Maintenance Expenditures Maximum	4.0gpre_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	15.0gpre_MinimumWorkingCapitalRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember
Net worth	100.0us-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	1.25gpre_DebtServiceCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember
Green Plains Obion [Member]
Debt Instrument [Line Items]
Working capital	9.0gpre_MinimumWorkingCapitalRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsObionMember
Net worth	95.0us-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	1.25gpre_DebtServiceCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsObionMember
Green Plains Processing [Member]
Debt Instrument [Line Items]
Fixed charge coverage ratio	1.25gpre_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	3.0gpre_MinimumWorkingCapitalRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember
Net worth	33.0us-gaap_MinimumNetWorthRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember
Debt service coverage ratio	1.0gpre_DebtServiceCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsSuperiorMember
Green Plains Grain [Member]
Debt Instrument [Line Items]
Working capital	23.0gpre_MinimumWorkingCapitalRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember
Net worth	26.3us-gaap_MinimumNetWorthRequiredForCompliance / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember
Fixed charge coverage ratio	1.25gpre_FixedChargeCoverageRatio / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember
Annual Leverage Ratio	6.00
Annual capital expenditures	15.0gpre_AnnualCapitalExpendituresMaximum / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember

X

- Definition

Annual Capital Expenditures, Maximum

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Maximum amount of annual capital maintenance expenditures.

+ References

No definition available.

+ Details

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Namespace Prefix:	gpre_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Annual leverage ratio

+ References

No definition available.

+ Details

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X

- Definition

Debt Service Coverage Ratio

+ References

No definition available.

+ Details

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Namespace Prefix:	gpre_
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X

- Definition

Fixed Charge Coverage Ratio

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Working capital – current assets less current liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	gpre_
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Balance Type:	debit
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X

- Definition

Percentage of net income added to base net worth compliance limit.

+ References

No definition available.

+ Details

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Namespace Prefix:	gpre_
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X

- 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

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X

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- Details

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- Details

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- Details

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- Details

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