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Related Party Transactions (Narrative) (Details)			3 Months Ended	12 Months Ended
	Oct. 01, 2020	Sep. 01, 2019	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Noncontrolling interests			$ 129,812,000	$ 129,812,000	$ 113,381,000
Outstanding accounts payable			140,058,000	140,058,000	156,693,000
Green Plains Cattle [Member]
Related Party Transaction [Line Items]
Amount paid on behalf of third party					2,200,000
Reduction in selling, general and administrative expenses				1,200,000	500,000
Revenues and cost of goods sold subsequent to disposition				8,200,000	4,000,000.0
Green Plains Cattle [Member] | Mr. Ejnar Knudsen [Member]
Related Party Transaction [Line Items]
Noncontrolling interests			$ 100,000	$ 100,000
Green Plains Cattle [Member] | Mr. Ejnar Knudsen [Member] | Indirect Interest By Mr. Ejnar Knudsen [Member]
Related Party Transaction [Line Items]
Indirect ownership interest percentage			0.0736%	0.0736%
Board of Directors Chairman [Member] | Aircraft Lease [Member]
Related Party Transaction [Line Items]
Number of related party transaction agreements | item				2
Number of leased aircrafts | item				2
Aircraft lease amount payable, per month				$ 11,588
Aircraft hours available				61 hours
Aircraft hours agreed per year				125 hours
Cash payments				$ 56,000	129,000	$ 159,000
Outstanding accounts payable			$ 0	$ 0	$ 17,000
Green Plains Cattle Company LLC [Member]
Related Party Transaction [Line Items]
Percent membership interest sold	50.00%	50.00%	50.00%

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