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Related-Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2022
Jul. 31, 2021
Jan. 31, 2022
Related-Party Transactions (Details) [Line Items]          
Accounts Payable, Related Parties, Current $ 0.6   $ 0.6   $ 0.5
One Earth Energy And Nu Gen Energy [Member]          
Related-Party Transactions (Details) [Line Items]          
Costs and Expenses, Related Party 35.3 $ 20.7 66.1 $ 37.4  
Accounts Payable, Related Parties, Current 0.6   0.6   $ 0.5
Refined Coal [Member]          
Related-Party Transactions (Details) [Line Items]          
Payments for Commissions $ 0.2   $ 0.2