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Employee Benefit Plans (Equity Compensation Plans) - Additional Information (Detail) - USD ($) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 05, 2018 | Oct. 31, 2018 | Oct. 31, 2017 | Apr. 06, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate restricted stock units outstanding (in shares) |  | 3,769,000 | 3,843,000 |  | 4,035,000 | 3,928,000
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) |  | 20,000 | 38,000 |  |  |
Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant (in shares) |  | 12,439,000 | 12,583,000 |  | 11,244,000 | 11,883,000
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) | 3,000,000 |  |  |  |  |
Shares available for future grant (in shares) |  | 12,400,000 |  |  |  |
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) |  | 3,600,000 |  |  |  |
2006 Employee Equity Incentive Plan | Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate stock options outstanding (in shares) |  | 5,900,000 |  |  |  |
2005 Non Employee Directors Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate restricted stock units outstanding (in shares) |  | 5,178 |  |  |  |
2005 Non Employee Directors Plan | Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate stock options outstanding (in shares) |  | 65,060 |  |  |  |
Aggregate stock options granted under 2005 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) |  | 415,613 |  | 450,000 |  |
Restricted stock awards issued (in shares) |  | 14,763 |  |  |  |
Aggregate grant date fair value of restricted stock awards |  | $ 1.2 |  |  |  |
2017 Directors Plan | Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate restricted stock units outstanding (in shares) |  | 14,763 |  |  |  |
2017 Directors Plan | Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Aggregate stock options outstanding (in shares) |  | 0 |  |  |  |
Other Assumed Stock Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Assumed shares remaining outstanding (in shares) |  | 500,000 |  |  |  |

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