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Basis of Presentation and Significant Accounting Policies - Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2021
Basis of Presentation and Significant Accounting Policies      
Research and development costs $ 0.1 $ 0.1 $ 0.3
Investment Income, Dividend 0.0 0.8 $ 0.6
Consulting fees   2.8  
Employee costs $ 5.5 $ 2.0