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Basis of Presentation and Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Basis of Presentation and Significant Accounting Policies      
Stock-based compensation expense $ 4,500 $ 3,600 $ 4,600