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Employee Benefit Plans (Equity Compensation Plans) - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 09, 2020 | Oct. 31, 2020 | Oct. 31, 2017 | Oct. 31, 2019 | Oct. 31, 2018 | Apr. 06, 2017
Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate restricted stock units outstanding (in shares) |  |  | 4,130,000 | 3,843,000 | 3,857,000 | 3,769,000 |
Restricted Stock Units | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period, (in years) |  |  | 3 years |  |  |  |
Restricted Stock Units | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period, (in years) |  |  | 4 years |  |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate restricted stock units outstanding (in shares) |  |  | 9,000 | 38,000 | 11,000 | 20,000 |
Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for future grant (in shares) | [1] |  | 12,129,000 | 12,583,000 | 12,208,000 | 12,439,000 |
2006 Employee Equity Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share based compensation arrangement for options contractual term (in years) |  |  | 7 years |  |  |  |
Vesting period, (in years) |  |  | 4 years |  |  |  |
Additional reserved for future issuance under the 2006 Employee Plan (in shares) |  | 3,500,000 |  |  |  |  |
Shares available for future grant (in shares) |  |  | 12,100,000 |  |  |  |
2006 Employee Equity Incentive Plan | Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate restricted stock units outstanding (in shares) |  |  | 4,100,000 |  |  |  |
2006 Employee Equity Incentive Plan | Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate stock options outstanding (in shares) |  |  | 3,900,000 |  |  |  |
2005 Non Employee Directors Plan | Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate stock options outstanding (in shares) |  |  | 29,222 |  |  |  |
Aggregate stock options granted under director plan (in shares) |  |  |  | 188,709 |  |  |
Fair value of option shares granted |  |  |  | $ 6.7 |  |  |
2005 Non Employee Directors Plan | Stock Option | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period, (in years) |  |  |  | 3 years |  |  |
2005 Non Employee Directors Plan | Stock Option | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period, (in years) |  |  |  | 4 years |  |  |
2017 Directors Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Reserved for future issuance (in shares) |  |  | 389,682 |  |  |  | 450,000
Restricted stock awards issued (in shares) |  |  | 9,412 |  |  |  |
Aggregate grant date fair value of restricted stock awards |  |  | $ 1.3 |  |  |  |
2017 Directors Plan | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate restricted stock units outstanding (in shares) |  |  | 9,412 |  |  |  |
2017 Directors Plan | Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Aggregate stock options outstanding (in shares) |  |  | 5,998 |  |  |  |
Aggregate stock options granted under director plan (in shares) |  |  | 5,998 |  |  |  |
Fair value of option shares granted |  |  | $ 1.4 |  |  |  |
2017 Directors Plan | Stock Option | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period, (in years) |  |  | 3 years |  |  |  |
Other Assumed Stock Plans |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Assumed shares remaining outstanding (in shares) |  |  | 100,000 |  |  |  |
[1] | Excluding shares reserved for future issuance under the 2017 Directors Plan.

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