Employee Benefit Plans - Stock Options and Restricted Stock Units Under all Equity Plans (Except 2005 Director's Plan) (Detail) - 2006 Employee Equity Incentive Plan shares in Thousands		12 Months Ended
		Oct. 31, 2021 shares	Oct. 31, 2020 shares	Oct. 31, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Available for grant, beginning balance (in shares)	[1]	12,129	12,208	12,439
Available for Grant, Additional shares reserved (in shares)	[1]	4,700	3,500	3,200
Available for grants, ending balance (in shares)	[1]	13,751	12,129	12,208
Share reserve ratio		1.70
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Available for Grant, Options granted (in shares)	[1],[2]	(353)	(694)	(799)
Available for Grant, Options canceled/forfeited/expired (in shares)	[1],[2]	36	102	129
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Available for Grant, Restricted stock units granted (in shares)	[3]	(3,232)	(3,469)	(3,134)
Available for Grant, Restricted stock units forfeited (in shares)	[3]	471	482	373

[1] Excluding shares reserved for future issuance under the 2017 Directors Plan.

[2] Options granted by the Company are not subject to the award multiplier ratio described above.

[3] Restricted stock units include awards granted under the 2006 Employee Plan and assumed through acquisitions. The number of RSUs reflects the application of the award multiplier of 1.70x as described above.