v3.26.1
Related-Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jul. 31, 2026
Jul. 31, 2025
Jul. 31, 2026
Jul. 31, 2025
Jan. 31, 2026
Related-Party Transactions [Abstract]          
Purchase of corn and other supplies from affiliates $ 21.2 $ 29.0 $ 40.1 $ 53.9  
Related Party [Member]          
Related-Party Transactions [Abstract]          
Accounts payable $ 1.0   $ 1.0   $ 1.2