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Related-Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Jan. 31, 2018
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party			$ 138.6	$ 121.8
Accounts Payable, Related Parties, Current	$ 2.0		2.0		$ 0.9
Accrued Liabilities for Commissions, Expense and Taxes	1.6		1.6		$ 1.5
Refined Coal [Member]
Related-Party Transactions (Details) [Line Items]
Payments for Commissions	0.4	$ 1.6	$ 0.7	$ 1.6
One Earth Energy And Nu Gen Energy [Member]
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party	$ 47.3	$ 43.4

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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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