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Basis of Presentation and Significant Accounting Policies - Goodwill and Acquired Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Basis of Presentation and Significant Accounting Policies      
Goodwill impairment loss $ 0.0 $ 0.0 $ 0.0
Impairment of long-lived assets $ 0.0 $ 0.0