Commitments and Contingencies - Additional Information (Detail) ft² in Thousands, $ in Millions			12 Months Ended
	Oct. 10, 2014 USD ($)	Oct. 04, 2012 lawsuit patent	Oct. 31, 2017 USD ($) ft² Building	Oct. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Mar. 16, 2017 USD ($)
Loss Contingencies [Line Items]
Rent expenses			$ 68.1	$ 63.9	$ 67.6
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
Pending Litigation | Mentor Patent Litigation
Loss Contingencies [Line Items]
Loss contingency patents infringement lawsuits | lawsuit		3
Loss contingency, patents allegedly infringed | patent		3
Loss contingency, value of damages sought	$ 36.0
Jury verdict assessing damages, value						$ 39.0