Segment Information (Schedule Of Financial Information By Reportable Segment) (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Oct. 31, 2015	Aug. 01, 2015	May. 02, 2015	[1]	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May. 03, 2014	[1]	Jan. 25, 2014	Oct. 31, 2015	Nov. 01, 2014	Oct. 26, 2013
Segment Reporting Information
Net revenues	$ 588,827	$ 551,819	$ 546,575		$ 576,239	$ 564,358	$ 545,464	$ 536,910		$ 564,535	$ 2,263,460	$ 2,211,267	$ 2,222,864
Cost of revenues											735,387	745,474	813,985
Gross margin	$ 394,277	$ 371,904	$ 372,209		$ 389,683	$ 377,118	$ 361,713	$ 354,292		$ 372,670	1,528,073	1,465,793	1,408,879
SAN Products
Segment Reporting Information
Net revenues											1,301,231	1,326,950	1,318,509
Cost of revenues											311,881	344,466	355,388
Gross margin											989,350	982,484	963,121
IP Networking Products
Segment Reporting Information
Net revenues											601,170	525,237	552,058
Cost of revenues											275,634	247,975	302,974
Gross margin											325,536	277,262	249,084
Global Services
Segment Reporting Information
Net revenues											361,059	359,080	352,297
Cost of revenues											147,872	153,033	155,623
Gross margin											$ 213,187	$ 206,047	$ 196,674

[1] The quarter ended May 3, 2014, includes the impact of an $83.4 million impairment of goodwill in the Company’s Application Delivery Products reporting unit.