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Employee Benefit Plans - Stock Options and Restricted Stock Units Under all Equity Plans (Except 2005 Director's Plan) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Oct. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |
Weighted- Average Exercise Price per Share, Options exercised (in USD per share) |  | $ 51.76 | $ 44.29 | $ 38.18 |
Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Available for grant, beginning balance (in shares) | [1] | 12,208 | 12,439 | 12,583 |
Available for Grant, Options granted (in shares) | [1] | (694) | (799) | (1,134) |
Available for Grant, Options canceled/forfeited/expired (in shares) | [1] | 102 | 129 | 157 |
Available for Grant, Restricted stock units granted (in shares) | [1],[2] | (3,469) | (3,134) | (2,541) |
Available for Grant, Restricted stock units forfeited (in shares) | [1],[2] | 482 | 373 | 374 |
Available for Grant, Additional shares reserved (in shares) | [1] | 3,500 | 3,200 | 3,000 |
Available for grants, ending balance (in shares) | [1] | 12,129 | 12,208 | 12,439 | 12,583
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Options Outstanding, Options granted (in shares) |  | 700 | 799 | 1,134 |
Options Outstanding, Options assumed (in shares) | [3] |  |  | 141 |
Options Outstanding, Options exercised (in shares) |  | (1,891) | (1,615) | (1,336) |
Options Outstanding, Options canceled/forfeited/expired (in shares) |  | (106) | (185) | (178) |
Options Outstanding, Exercisable (in shares) |  | 2,311 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |
Weighted- Average Exercise Price per Share, Beginning balance (in USD per share) |  | $ 65.57 | $ 55.63 | $ 46.83 |
Weighted- Average Exercise Price per Share, Options granted (in USD per share) |  | 143.44 | 113.17 | 89.52 |
Weighted- Average Exercise Price per Share, Options assumed (in USD per share) | [3] |  |  | 18.66 |
Weighted- Average Exercise Price per Share, Options exercised (in USD per share) |  | 51.76 | 44.29 | 38.18 |
Weighted- Average Exercise Price per Share, Options canceled/forfeited/expired (in USD per share) |  | 84.14 | 58.02 | 51.82 |
Weighted- Average Exercise Price per Share, Ending balance (in USD per share) |  | 85.26 | $ 65.57 | $ 55.63 | $ 46.83
Weighted- Average Exercise Price per Share, Exercisable (in USD per share) |  | $ 65.36 |  |  |
Weighted Average Remaining Contractual Life, options outstanding |  | 4 years 1 month 6 days | 4 years 29 days | 4 years 4 months 20 days | 4 years 7 months 6 days
Weighted-Average Remaining Contractual Life , Exercisable |  | 3 years 2 months 23 days |  |  |
Aggregate Intrinsic Value, Beginning balance |  | $ 373,112 | $ 214,432 | $ 263,555 |
Aggregate Intrinsic Value, ending Balance |  | 513,845 | $ 373,112 | $ 214,432 | $ 263,555
Aggregate Intrinsic Value, Exercisable |  | $ 343,230 |  |  |
Stock Option | All Stock Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Options outstanding, beginning balance (in shares) |  | 5,290 | 6,291 | 6,530 |
Options outstanding, ending balance (in shares) |  | 3,993 | 5,290 | 6,291 | 6,530
[1] | Excluding shares reserved for future issuance under the 2017 Directors Plan.
[2] | These amounts do not reflect the actual number of restricted stock units granted or forfeited but rather the effect on the total remaining shares available for future grants after the application of the share reserve ratio. For more information about the share reserve ratio, please see Restricted Stock Units above.
[3] | The Company assumed options outstanding under various plans through acquisitions.

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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