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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Aug. 18, 2021 | Jun. 30, 2021 | Jul. 31, 2021 | Jul. 31, 2020 | [2] | Jul. 31, 2021 | Jul. 31, 2020 | [2] | Jun. 17, 2021
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  |  | $ 500.0
Remaining amount available for further repurchases |  |  | $ 325.0 |  |  | $ 325.0 |  |
Purchases of treasury stock (in shares) |  |  | 521 | [1] | 149 | 2,114 | 1,380 |
June 2021, ASR |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  | $ 175.0 |  |  |  |  |  |
Prepayment to repurchase stock |  | 175.0 |  |  |  |  |  |
Initial share delivery |  | $ 140.0 |  |  |  |  |  |
June 2021, ASR | Subsequent Event |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, future derivative settlement | $ 35.0 |  |  |  |  |  |  |
Purchases of treasury stock (in shares) | 600 |  |  |  |  |  |  |
Purchases of treasury stock (in USD per share) | $ 282.13 |  |  |  |  |  |  |
[1] | Do es not include the 99,573 shares and $35.0 million equity forward contract from the June 2021 ASR.
[2] | The third quarter of fiscal 2020 includes the settlement of the 148,953 shares and $20.0 million equity forward contract from the February 2020 ASR settled in May 2020.

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