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Derivative Financial Instruments (Details) bu in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2023 USD ($) bu	Jul. 31, 2022 USD ($)	Jul. 31, 2023 USD ($) bu	Jul. 31, 2022	Jan. 31, 2023 USD ($) bu
Derivative Financial Instruments (Details) [Line Items]
Debt Instrument, Collateral Amount (in Dollars) | $	$ 2		$ 2		$ 1.7
Gain (Loss) on Derivative Instruments, Net, Sales and Revenue (in Dollars) | $	0.1	$ (1.5)
Gain (Loss) on Derivative Instruments, Net, Pretax (in Dollars) | $	$ 0.8	$ 1.2
Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Description of Location of Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments in Financial Statements			$5.0	(12.9)
Ethanol [Member]
Derivative Financial Instruments (Details) [Line Items]
Description of Location of Gain (Loss) on Interest Rate Derivative Instruments Not Designated as Hedging Instruments in Financial Statements			$0.9	(1.2)
Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity	16.3		16.3		12.8
Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Forward Purchase Contracts, Quantity					5.2
Short/Sell [Member] | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity	9.6		9.6		3.2
Short/Sell [Member] | Liability [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity					1.4
Long/Buy [Member] | Assets [Member] | Corn [Member]
Derivative Financial Instruments (Details) [Line Items]
Commodity Futures, Quantity					725,000.0

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