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Debt (Schedule Of Principal Payments Of Long-Term Debt) (Details) (Ethanol Production Segment [Member], Term Loan [Member], USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Green Plains Fairmont and Green Plains Wood River [Member] |
Debt Instrument [Line Items] |
Scheduled principal payments, periodic | $ 1.3 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember / us-gaap_StatementBusinessSegmentsAxis = gpre_EthanolProductionSegmentMember
Green Plains Holdings II [Member] |
Debt Instrument [Line Items] |
Scheduled principal payments, periodic | 1.8 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / dei_LegalEntityAxis = gpre_GreenPlainsHoldingsTwoMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember / us-gaap_StatementBusinessSegmentsAxis = gpre_EthanolProductionSegmentMember
Green Plains Processing [Member] |
Debt Instrument [Line Items] |
Scheduled principal payments, periodic | $ 0.6 us-gaap_DebtInstrumentPeriodicPaymentPrincipal / dei_LegalEntityAxis = gpre_GreenPlainsProcessingMember / us-gaap_LongtermDebtTypeAxis = gpre_TermLoanMember / us-gaap_StatementBusinessSegmentsAxis = gpre_EthanolProductionSegmentMember

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration