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Related-Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Related-Party Transactions (Details) [Line Items]
Accounts Payable, Related Parties, Current	$ 2.5		$ 2.5		$ 0.7
One Earth Energy And Nu Gen Energy [Member]
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party	20.7	$ 4.9	37.4	$ 17.2
Accounts Payable, Related Parties, Current	2.5		2.5		0.7
Refined Coal [Member]
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party	0.2	$ 0.2	0.2	$ 0.1
Accrued Liabilities for Commissions, Expense and Taxes	$ 0.1		$ 0.1		$ 0.1

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The carrying amount for commissions, taxes and other expenses that were incurred but unpaid as of the balance sheet date.

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Costs of sales and operating expenses for the period incurred from transactions with related parties.

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