Debt (Schedule Of Short-term Notes Payable And Other Borrowings) (Details) - USD ($)	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	$ 187,812,000		$ 163,751,000
Current liabilities of discontinued operations			418,936,000
Green Plains Cattle [Member] | $500.0 Million Revolver [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	500,000,000.0
Green Plains Grain [Member] | $100.0 Million Revolver [Member]
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	40,000,000		41,000,000
Debt instrument, face amount	100,000,000.0		100,000,000.0
Green Plains Grain [Member] | $50.0 Million Inventory Financing [Member]
Debt Instrument [Line Items]
Debt instrument, face amount	50,000,000.0
Green Plains Trade [Member] | $300.0 Million Revolver [Member]
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	138,204,000		108,485,000
Debt instrument, face amount	300,000,000.0		300,000,000.0
Green Plains Commodity Management [Member] | $30.0 Million Hedge Line [Member]
Debt Instrument [Line Items]
Short-term notes payable and other borrowings	9,608,000		14,266,000
Debt instrument, face amount	$ 30,000,000.0		30,000,000.0
Restatement Adjustment [Member] | Green Plains Cattle [Member] | $500.0 Million Revolver [Member]
Debt Instrument [Line Items]
Current liabilities of discontinued operations		$ 374,500,000	$ 374,500,000