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Related-Party Transactions (Details) - USD ($)	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017	Jan. 31, 2018
Related-Party Transactions (Details) [Line Items]
Accounts Payable, Related Parties, Current	$ 1,300,000		$ 900,000
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party	100,000
Refined Coal [Member]
Related-Party Transactions (Details) [Line Items]
Accrued Liabilities for Commissions, Expense and Taxes	1,500,000
Refined Coal [Member]
Related-Party Transactions (Details) [Line Items]
Accrued Liabilities for Commissions, Expense and Taxes			$ 1,500,000
One Earth Energy And Nu Gen Energy [Member]
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party	$ 46.1	$ 42,300,000

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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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Amount of selling, general and administrative expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

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