Commitments and Contingencies - Additional Information (Detail) ft² in Thousands	12 Months Ended
	Oct. 31, 2018 USD ($) ft² Building	Oct. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)
Loss Contingencies [Line Items]
Rent expenses	$ 75,700,000	$ 68,100,000	$ 63,900,000
Number of buildings to be leased | Building	2
Total square feet of buildings | ft²	341
Lease renewal term, in years	10 years
Second lease renewal term, years	9 years
Payments for legal settlements	$ 65,000,000
Release of loss contingency accrual	39,000,000
Litigation settlement, expense	$ 26,000,000
Patent cross-license	7 years
Minimum
Loss Contingencies [Line Items]
Potential one-time termination charge	$ 0
Maximum
Loss Contingencies [Line Items]
Potential one-time termination charge	$ 25,000,000.0