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Derivative Financial Instruments (Details) bu in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2022 USD ($) bu	Jul. 31, 2021 USD ($)	Jul. 31, 2022 USD ($) bu	Jul. 31, 2021 USD ($)	Jan. 31, 2022 USD ($) bu
Derivative Financial Instruments (Details) [Line Items]
Debt Instrument, Collateral Amount | $	$ 3,332,000		$ 3,332,000		$ 2,222,000
Gain (Loss) on Derivative Instruments, Net, Sales and Revenue | $	1,474,000	$ 1,638,000	1,152,000	$ 2,764,000
Gain (Loss) on Derivative Instruments, Net, Pretax | $	$ 1,152,000	$ 6,142,000	$ 12,928,000	$ 8,036,000
Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels)					19.2
Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity (in US Bushels)	12.3		12.3
Short/Sell [Member] | Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity (in US Bushels)	7.4		7.4		7.4
Long-Term Contract with Customer [Member] | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity (in US Bushels)	25,000.0		25,000.0

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Amount of assets pledged to secure a debt instrument.

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