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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 | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Apr. 30, 2021 | Apr. 30, 2020 | [2] | Apr. 30, 2021 | Apr. 30, 2020 | [2] | Jun. 19, 2020
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  |  |  |  |  | $ 500.0
Remaining amount available for further repurchases | $ 59.8 |  |  | $ 59.8 |  |  | $ 59.8 |  |
Purchases of treasury stock (in shares) |  |  |  | 756 | [1] | 652 | 1,593 | 1,231 |
December 2020, ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 250.0 |  |  |  |  |  |
Prepayment to repurchase stock |  |  | 250.0 |  |  |  |  |  |
Initial share delivery |  |  | $ 200.0 |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, future derivative settlement |  | $ 50.0 |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  | 1,000 |  |  |  |  |  |
Purchases of treasury stock (in USD per share) |  |  | $ 252.36 |  |  |  |  |  |
April 2021, ASR |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount | $ 100.0 |  |  | $ 100.0 |  |  | $ 100.0 |  |
Purchases of treasury stock (in shares) | 400 |  |  |  |  |  |  |  |
Purchases of treasury stock (in USD per share) | $ 253.54 |  |  |  |  |  |  |  |
[1] | Includes the 166,276 shares and $50.0 million equity forward contract, respectively, from the December 2020 ASR.
[2] | Does not include the 148,953 shares and $20.0 million equity forward contract, respectively, from the February 2020 ASR settled in May 2020.

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