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Acquisitions, Dispositions And Discontinued Operations (Narrative) (Details) $ in Thousands, shares in Millions |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2020 USD ($) | Dec. 09, 2020 USD ($) | Oct. 01, 2020 USD ($) | Sep. 01, 2019 USD ($) | Nov. 27, 2018 USD ($) | Nov. 15, 2018 USD ($) property shares | Dec. 31, 2020 USD ($) item | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Aug. 01, 2018 USD ($) item
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets |  |  |  |  |  |  |  | $ 2,000 |  |  | $ 2,000 | $ (20,860) |  | $ 150,351 |
Number of ethanol plants | item |  |  |  |  |  |  | 12 |  |  |  |  | 12 |  |  |
Reduction in other assets |  |  | $ (69,700) |  |  |  |  |  |  |  |  |  |  |  |
Reduction in accumulated other comprehensive income |  |  | (10,700) |  |  |  |  |  |  |  |  |  |  |  |
Asset Purchase Agreement With Bartlett Cattle Company L.P. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of cattle-feeding operations | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Feedlot capacity, head of cattle | item |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 97,000
Property and equipment, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,190
Working capital payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 106,600
Working capital payments |  |  |  |  |  |  |  |  |  |  |  |  | $ 900 |  |
Fluid Quip Technologies, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid for business acquisition |  | $ 29,100 |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated amount of noncontrolling interest from acquisition |  | 6,700 |  |  |  |  |  |  |  |  |  |  |  |  |
Settled liabilities assumed |  | $ 2,400 |  |  |  |  |  |  |  |  |  |  |  |  |
Fleischmann's Vinegar [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Working capital payments |  |  |  |  |  |  |  |  | $ 300 | $ 300 |  |  |  |  |
Gain (loss) on disposal of assets |  |  |  |  | $ 58,200 |  |  |  |  |  |  |  |  |  |
Disposal Of Assets, Transaction Costs |  |  |  |  | 7,400 |  |  |  |  |  |  |  |  |  |
Assets to be disposed of in the sale |  |  |  |  | $ 354,000 |  |  |  |  |  |  |  |  |  |
Bluffton, Lakota and Riga Ethanol Plants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid for business acquisition |  |  |  |  |  | $ 120,900 |  |  |  |  |  |  |  |  |
Working capital payments |  |  |  |  |  |  |  |  |  | $ 3,400 |  |  |  |  |
Gain (loss) on disposal of assets |  |  |  |  |  | 92,200 |  |  |  |  |  |  |  |  |
Disposal Of Assets, Transaction Costs |  |  |  |  |  | $ 4,200 |  |  |  |  |  |  |  |  |
Number of ethanol plants | property |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |
Assets to be disposed of in the sale |  |  |  |  |  | $ 323,200 |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units | shares |  |  |  |  |  | 8.7 |  |  |  |  |  |  |  |  |
General Partner's Interest Percent |  |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Additional Consideration |  |  |  |  |  | $ 2,700 |  |  |  |  |  |  |  |  |
Green Plains Cattle Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid for business acquisition |  |  |  | $ 76,900 |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets |  |  |  | $ 0 |  |  | $ (500) | $ 2,000 |  |  |  |  |  |  |
Assets to be disposed of in the sale |  |  | $ 80,500 |  |  |  |  |  |  |  |  |  |  |  |
Percent membership interest sold |  |  | 50.00% | 50.00% |  |  | 50.00% |  |  |  |  |  |  |  |
Reduction in other assets |  |  | $ (69,700) |  |  |  |  |  |  |  |  |  |  |  |
Hereford Ethanol Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets | $ 22,400 |  |  |  |  |  | $ (22,400) |  |  |  |  |  |  |  |
Assets to be disposed of in the sale | 39,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certain Railcar Operating Leases, Hereford Ethanol Partners [Member] | Green Plains Partners LP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets to be disposed of in the sale | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Partner [Member] | Bluffton, Lakota and Riga Ethanol Plants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' Capital Account, Units | shares |  |  |  |  |  | 0.2 |  |  |  |  |  |  |  |  |
Corporate Activities [Member] | Bluffton, Lakota and Riga Ethanol Plants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets |  |  |  |  |  | $ 89,500 |  |  |  |  |  |  |  | $ 150,400 |
Disposal Of Assets, Transaction Costs |  |  |  |  |  | 3,700 |  |  |  |  |  |  |  |  |
Corporate Activities [Member] | Green Plains Cattle Company LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets |  |  |  |  |  |  |  |  |  |  |  | $ 1,500 |  |  |
Corporate Activities [Member] | Hereford Ethanol Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets | 18,500 |  |  |  |  |  |  |  |  |  |  | $ (18,500) |  |  |
Green Plains Partners [Member] | Bluffton, Lakota and Riga Ethanol Plants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets |  |  |  |  |  | 2,700 |  |  |  |  |  |  |  |  |
Disposal Of Assets, Transaction Costs |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
Ethanol Production Segment [Member] | Hereford Ethanol Plant [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on disposal of assets | $ 3,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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