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
		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.