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Stock Repurchase Program - Additional Information (Detail) - USD ($) | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2020 | Feb. 29, 2020 | Dec. 31, 2019 | Feb. 29, 2020 | Jan. 31, 2018 | May 31, 2020 | Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | [1] | Jun. 19, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Average purchase price (in USD per share) |  |  |  |  |  |  | $ 152.76 | $ 120.49 | $ 89.59 |
Stock repurchase program authorized amount |  |  |  |  |  |  | $ 500,000,000.0 |  |  | $ 500,000,000.0
Remaining amount available for further repurchases |  |  |  |  |  |  | $ 457,900,000 |  |  |
Purchases of treasury stock (in shares) |  |  |  |  |  |  | 1,585,000 | 2,732,000 | 4,688,000 |
Accelerated Share Repurchase Program September 2017 |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during period, derivative settlement |  |  |  |  | $ 20,000,000.0 |  |  |  |  |
Accelerated Share Repurchase Program December 2019 |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Average purchase price (in USD per share) |  |  |  | $ 149.75 |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 100,000,000.0 |  |  |  |  |  |  |
Prepayment during period |  |  | 100,000,000.0 |  |  |  |  |  |  |
Initial share delivery, amount |  |  | $ 80,000,000.0 |  |  |  |  |  |  |
Prepayment during prior period, derivative settlement |  | $ 20,000,000.0 |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  | 700,000 |  |  |  |  |  |
Accelerated Share Repurchase Program February 2020 ASR |  |  |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Average purchase price (in USD per share) |  |  |  |  |  | $ 140.41 |  |  |  |
Stock repurchase program authorized amount |  | 100,000,000.0 |  | $ 100,000,000.0 |  |  |  |  |  |
Prepayment during period |  | 100,000,000.0 |  |  |  |  |  |  |  |
Initial share delivery, amount |  | $ 80,000,000.0 |  | $ 80,000,000.0 |  |  |  |  |  |
Prepayment during prior period, derivative settlement | $ 20,000,000.0 |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  |  |  | 700,000 |  |  |  |
[1] | The first quarter of fiscal 2018 includes the settlement of the $20.0 million equity forward contract related to the September 2017 ASR.

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