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Derivative Financial Instruments (Details) $ in Thousands, gal in Millions, bu in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2020 USD ($) bu gal	Jul. 31, 2019 USD ($)	Jul. 31, 2020 USD ($) bu gal	Jul. 31, 2019 USD ($)	Jan. 31, 2020 USD ($) bu
Derivative Financial Instruments (Details) [Line Items]
Debt Instrument, Collateral Amount | $	$ 950		$ 950		$ 1,113
Gain (Loss) on Derivative Instruments, Net, Pretax | $	(4,613)	$ 537	(1,758)	$ 1,230
Gain (Loss) on Derivative Instruments, Net, Sales and Revenue | $	$ 298		$ 298
Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels)	1.3		1.3
Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels)	1.9		1.9		1.6
Short/Sell [Member] | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity	4.5		4.5		3.7
Short/Sell [Member] | Assets [Member] | Ethanol [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity | gal	5.5		5.5
Short/Sell [Member] | Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity	2.8		2.8
Long/Buy | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity					2.2

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