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Employee Benefit Plans (Employee Stock Purchase Plan) - Additional Information (Detail) - $ / shares shares in Millions | 12 Months Ended |
--- | --- | ---
Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | Apr. 09, 2020
Share-based Payment Arrangement [Abstract] |  |  |  |
Threshold for employee stock purchases under ESPP, maximum value | 85.00% |  |  |
ESPP offering period (in years) | 2 years |  |  |
Increase in number of shares authorized for issuance under plan (in shares) |  |  |  | 5.0
Shares issued (in shares) | 1.0 | 1.2 | 1.2 |
Weighted average purchase price of stock purchased (in USD per share) | $ 103.41 | $ 73.18 | $ 62.52 |
Shares reserved for future issuance under the ESPP (in shares) | 13.8 |  |  |

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