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Related-Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019	Jan. 31, 2020
Related-Party Transactions (Details) [Line Items]
Accounts Payable, Related Parties, Current	$ 777		$ 777		$ 686
One Earth Energy And Nu Gen Energy [Member]
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party	16,900	$ 58,500	34,000	$ 148,700
Accounts Payable, Related Parties, Current	800		800		700
Refined Coal [Member]
Related-Party Transactions (Details) [Line Items]
Payments for Commissions	15,000,000	$ 242,000,000	160,000,000	$ 577,000,000
Accrued Liabilities for Commissions, Expense and Taxes	$ 200		$ 200		$ 500

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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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The amount of cash paid for commissions during the current period.

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