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Basis of Presentation and Significant Accounting Policies - Research and Development and Restructuring Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Significant Accounting Policies [Line Items]      
Research and development costs $ 0.3 $ 0.7  
Investment Income, Dividend 0.6 $ 0.6 $ 0.6
Employee costs 0.6    
Selling, general and administrative expenses      
Significant Accounting Policies [Line Items]      
Consulting fees $ 0.9    
Maximum      
Significant Accounting Policies [Line Items]      
Research and development costs     $ 0.1