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Stock-Based Compensation - Summarized Activity Related to Restricted Stock Units (Detail) - Restricted Stock Unit
shares in Thousands
12 Months Ended
Oct. 31, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Restricted Shares/Units, Beginning balance (in shares) 0
Number of Restricted Share Units, Granted (in shares) 7
Number of Restricted Share Units, Vested (in shares) (7)
Number of Restricted Shares/Units, Ending balance (in shares) 0
Weighted-Average Grant Date Fair Value, Granted (in dollars per share) | $ / shares $ 160.68
Weighted-Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares $ 160.68