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Employee Benefit Plans (Restricted Stock Units) - Additional Information (Detail) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Oct. 31, 2020 USD ($) $ / shares | Oct. 31, 2020 USD ($) $ / shares
Schedule Of Restricted Stock [Line Items] |  |
Closing stock price (in USD per share) | $ / shares | $ 213.86 | $ 213.86
Unamortized share-based compensation expense | $ 488.6 | $ 488.6
Weighted-average period of total compensation costs to be recognized over a period in years |  | 2 years 3 months 18 days
Restricted Stock Units |  |
Schedule Of Restricted Stock [Line Items] |  |
share reserve ratio | 1.70 |
Restricted Stock Units | Minimum |  |
Schedule Of Restricted Stock [Line Items] |  |
Vesting period, (in years) |  | 3 years
Restricted Stock Units | Maximum |  |
Schedule Of Restricted Stock [Line Items] |  |
Vesting period, (in years) |  | 4 years
Employee Stock Purchase Plan |  |
Schedule Of Restricted Stock [Line Items] |  |
Unamortized share-based compensation expense | $ 55.8 | $ 55.8
Weighted-average period of total compensation costs to be recognized over a period in years |  | 2 years

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