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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