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v2.4.1.9

Debt (Schedule Of Free Cash Flow Payments Annual Threshold) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Green Plains Processing [Member] |
Debt Instrument [Line Items] |
Free cash flow payment annual threshold | $ 54.0 gpre_FreeCashFlowPaymentAnnualThreshold / dei_LegalEntityAxis = gpre_GreenPlainsProcessingMember
Former Free Cash Flow Payment Annual Threshold | 27.0 gpre_FormerFreeCashFlowPaymentAnnualThreshold / dei_LegalEntityAxis = gpre_GreenPlainsProcessingMember
Ethanol Production Segment [Member] | Green Plains Bluffton [Member] | Term Loan [Member] |
Debt Instrument [Line Items] |
Free cash flow payment annual threshold | $ 4.0 gpre_FreeCashFlowPaymentAnnualThreshold / dei_LegalEntityAxis = gpre_GreenPlainsBlufftonMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember / us-gaap_StatementBusinessSegmentsAxis = gpre_EthanolProductionSegmentMember

X
- Definition Former Free Cash Flow Payment Annual Threshold + References No definition available. + Details
Name: | gpre_FormerFreeCashFlowPaymentAnnualThreshold
Namespace Prefix: | gpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Free Cash Flow Payment Annual Threshold + References No definition available. + Details
Name: | gpre_FreeCashFlowPaymentAnnualThreshold
Namespace Prefix: | gpre_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=gpre_GreenPlainsProcessingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=gpre_EthanolProductionSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |