Income Taxes - Rate Reconciliation Between Provision for Income Taxes and Taxes Computed at Statutory Federal Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal tax	$ 134,084	$ 115,343	$ 98,564
State tax (benefit), net of federal effect	(20,071)	(14,492)	(7,186)
Tax credits	(24,365)	(36,979)	(13,301)
Tax on foreign earnings less than U.S. statutory tax	(52,413)	(68,246)	(56,536)
Tax settlements	(7,057)	(16,479)	(6,251)
Stock-based compensation	(26,205)	5,709	5,406
Changes in valuation allowance	47,745	25,590	2,206
Integration of acquired technologies	36,443	37,525	33,015
Undistributed earnings of foreign subsidiaries	(9,610)	9,940	0
Tax impact of repatriation	166,152	0	0
Other	1,832	4,811	(241)
Provision (benefit) for income taxes	$ 246,535	62,722	55,676
Tax benefit, research, amount		$ 37,100	$ 12,400