Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended			12 Months Ended
	Jul. 31, 2017	Oct. 31, 2018	Jul. 31, 2018	Jan. 31, 2018	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Taxes [Line Items]
Integration of acquired technologies, tax recognition period					5 years
Blended tax rate					23.40%
Tax Cuts And Jobs Act Of 2017 provisional tax expense				$ 45,600,000
Tax Cuts And Jobs Act Of 2017 tax expense		$ 51,100,000
Tax Cuts And Jobs Act Of 2017 provisional transition tax expense			$ 73,400,000
Tax Cuts And Jobs Act Of 2017 provisional transition tax payable			$ 17,900,000
Tax Cuts And Jobs Act Of 2017, transition tax expense		63,100,000
Tax Cuts And Jobs Act Of 2017, transition tax payable		8,900,000
Deferred income tax expense		172,000,000			$ (210,310,000)	$ 123,052,000	$ (14,037,000)
Provision (benefit) for income taxes					(68,975,000)	246,535,000	62,722,000
Increase in valuation allowance					79,500,000
Tax credits					35,142,000	24,365,000	36,979,000
Increase in gross unrecognized tax benefits					39,300,000
Gross unrecognized tax benefits		131,019,000			131,019,000	91,637,000	106,542,000
Unrecognized tax benefits affecting effective tax rate		120,900,000			120,900,000	88,500,000
The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations					9,400,000	200,000	800,000
The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations		12,600,000			12,600,000	3,200,000
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities					175,000	784,000
Cash paid for income taxes during the year:					252,522,000	103,478,000	69,447,000
Foreign Tax Authority
Taxes [Line Items]
Cash paid for income taxes during the year:		67,700,000
Domestic Tax Authority
Taxes [Line Items]
Tax credits					50,800,000
California Franchise Tax Board | fiscal year 2012 to 2014
Taxes [Line Items]
Increase in valuation allowance						13,200,000
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities						14,600,000
Tax impact from tax settlements						400,000
Decrease in deferred tax assets						1,100,000
California Franchise Tax Board | fiscal year 2009 to 2011
Taxes [Line Items]
Increase in valuation allowance							5,400,000
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities							10,300,000
Decrease in deferred tax assets							4,900,000
Internal Revenue Service (IRS) | Fiscal Year 2017
Taxes [Line Items]
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities					21,800,000
Internal Revenue Service (IRS) | Fiscal Year 2016
Taxes [Line Items]
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities						4,600,000
Internal Revenue Service (IRS) | Fiscal Year 2015
Taxes [Line Items]
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities							$ 20,700,000
Hungary | Fiscal Year 2011 to 2013
Taxes [Line Items]
Provision (benefit) for income taxes					5,700,000
The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations	$ 18,000,000
Proposed tax assessment	$ 44,500,000
Remaining tax assessment amount					36,200,000
KOREA, REPUBLIC OF | Fiscal years 2012 to 2016
Taxes [Line Items]
Tax impact from tax settlements					7,900,000
Taiwan | Fiscal Year 2014
Taxes [Line Items]
Tax impact from tax settlements					10,900,000
Taiwan | Fiscal Year 2011
Taxes [Line Items]
Decrease in unrecognized tax benefits resulting from settlement with taxing authorities						700,000
Cash paid for income taxes during the year:						300,000
INDIA | Fiscal 2010 to 2015
Taxes [Line Items]
Tax impact from tax settlements						$ 4,600,000
Minimum
Taxes [Line Items]
Estimated potential decrease in underlying unrecognized tax benefits, minimum		0			0
Maximum
Taxes [Line Items]
Estimated potential decrease in underlying unrecognized tax benefits, minimum		$ 7,000,000			$ 7,000,000