Income Taxes - Provision for Income Taxes and Effective Tax Rates (Detail) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Jul. 31, 2020 |
Jul. 31, 2019 |
Jul. 31, 2020 |
Jul. 31, 2019 |
|
| Income Tax Disclosure [Abstract] | ||||
| Income before income taxes | $ 236,854 | $ 132,911 | $ 446,593 | $ 413,883 |
| Provision (benefit) for income taxes | $ (16,057) | $ 32,982 | $ (20,299) | $ 42,230 |
| Effective tax rate | (6.80%) | 24.80% | (4.50%) | 10.20% |