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v2.4.1.9

Debt (Narrative - Short-term notes payable and other borrowings) (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2014 | Jul. 31, 2014
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Debt Instrument [Line Items] |  |  |
Debt instrument amount | $ 22,000,000 us-gaap_DebtInstrumentFaceAmount |  |
Green Plains Grain [Member] | Revolving Line Of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Amount Outstanding | 95,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember | 37,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsGrainMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember |
Green Plains Cattle [Member] | Revolving Line Of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Amount Outstanding |  | 77,000,000 us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsCattleMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember |
Green Plains Trade [Member] | Revolving Line Of Credit [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility, Amount Outstanding | 76,500,000 us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsTradeMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember | 95,900,000 us-gaap_LineOfCreditFacilityAmountOutstanding / dei_LegalEntityAxis = gpre_GreenPlainsTradeMember / us-gaap_LongtermDebtTypeAxis = gpre_RevolvingLineOfCreditMember |
Green Plains Fairmont and Green Plains Wood River [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument amount |  |  | $ 50,000,000 us-gaap_DebtInstrumentFaceAmount / dei_LegalEntityAxis = gpre_GreenPlainsFairmontAndGreenPlainsWoodRiverMember

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount borrowed under the credit facility as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

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