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Derivative Financial Instruments (Details) gal in Millions, bu in Millions	3 Months Ended
	Apr. 30, 2020 USD ($) bu gal	Apr. 30, 2019 USD ($)	Jan. 31, 2020 USD ($) bu
Derivative Financial Instruments (Details) [Line Items]
Debt Instrument, Collateral Amount (in Dollars) | $	$ 1,410,000		$ 1,113,000
Gain (Loss) on Derivative Instruments, Net, Pretax (in Dollars) | $	$ 3,144,000	$ 369,000
Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity	0.2		1.6
Short/Sell [Member] | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity	3.2		3.7
Short/Sell [Member] | Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity	0.3
Long/Buy | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity			2.2
Long/Buy | Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity	3.8
Long/Buy | Liability [Member] | Ethanol [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity | gal	0.4

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Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

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