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Related-Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Jan. 31, 2018
Related-Party Transactions (Details) [Line Items]          
Costs and Expenses, Related Party     $ 91.4 $ 78.7  
Accounts Payable, Related Parties, Current $ 1.4   1.4   $ 0.9
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party 0.2   0.3    
Refined Coal [Member]          
Related-Party Transactions (Details) [Line Items]          
Accrued Liabilities for Commissions, Expense and Taxes 1.5   $ 1.5   $ 1.5
One Earth Energy And Nu Gen Energy [Member]          
Related-Party Transactions (Details) [Line Items]          
Costs and Expenses, Related Party $ 45.2 $ 36.5