Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 28, 2012 months	Jan. 28, 2012 Enterasys [Member]	Jan. 24, 2011 Enterasys [Member]	May 21, 2010 Enterasys [Member]	Aug. 28, 2007 Enterasys [Member]	Jun. 21, 2005 Enterasys [Member]	Jan. 28, 2012 A10 Networks [Member]	Oct. 29, 2010 A10 Networks [Member]	Sep. 09, 2009 A10 Networks [Member]
Aggregate commitment for inventory components	$ 237.5
Aggregate purchase commitments reserve	$ 5.4
Purchase commitments reserve period, months	12
Number of pending litigations cases challenging underwriter practices, minimum	300
Number of alleged patents infringed and seeking injunctive relief						6	1	13	2
Number of patents filed for reexamination					5
Number of patent claims determined invalid and received final rejections					2
Number of patent claim rejections partially affirmed and reversed			1
Number of remaining patents undergoing reexamination		3
Number of patents remaining at issue in the litigation		4
Number of patents dropped from the litigation, previously appealed				2