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Basis of Presentation and Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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