Commitments And Contingencies (Loss Contingency Narrative) (Details)	9 Months Ended						0 Months Ended
	Jul. 28, 2012 Enterasys [Member] patents	May 21, 2010 Enterasys [Member] patents	Aug. 28, 2007 Enterasys [Member] patents	Jun. 21, 2005 Enterasys [Member] patents	Jul. 28, 2012 A10 Networks [Member] patents	Sep. 09, 2011 A10 Networks [Member] patents	Apr. 12, 2012 Proxy Statement Stockholder Litigation [Member]
Loss Contingencies [Line Items]
Period of postponement of proposal vote							7 days
Number of alleged patents infringed and seeking injunctive relief				6		2
Number of patents filed for reexamination			5
Number of patent claims determined invalid and received final rejections			2
Number Of Remaining Patents Undergoing Reexamination	3
Number of patents dropped from the litigation, previously appealed		2			1
Number of patents remaining at issue in the litigation	4