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Other Assets - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Amortization expense $ 1.2 $ 1.5 $ 1.6
Amortization expense for 2018 1.1    
Amortization expense for 2019 0.7    
Amortization expense for 2020 0.1    
Amortization expense after 2020, through 2023 0.1    
Amortization expense for the year 2020 $ 0.1