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Stock Repurchase Program - Stock Repurchase Activities (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2020 | Jul. 31, 2021 | [1] | Jul. 31, 2020 | [2] | Jul. 31, 2021 | Jul. 31, 2020 | [2]
Stock Repurchase Program [Abstract] |  |  |  |  |
Purchases of treasury stock (in shares) |  | 521,000 | 149,000 | 2,114,000 | 1,380,000
Aggregate purchased shares |  | $ 140,000 | $ 20,000 | $ 538,082 | $ 200,000
Reissuance of treasury stock |  | 564,000 | 999,000 | 2,093,000 | 2,807,000
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Share repurchases settlement of equity forward (in shares) | 148,953 |  |  | 99,573 |
June 2021, ASR |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Stock repurchase program, prepayment during period, derivative settlement |  |  |  | $ 35,000 |
February 2020, ASR |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |
Stock repurchase program, prepayment during period, derivative settlement | $ 20,000 |  |  |  |
[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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