Commitments And Contingencies (Loss Contingency Narrative) (Details)	3 Months Ended						0 Months Ended
	Jan. 26, 2013 Enterasys patents	May 21, 2010 Enterasys patents	Aug. 28, 2007 Enterasys patents	Jun. 21, 2005 Enterasys patents	Jan. 26, 2013 A10 Networks patents	Sep. 09, 2011 A10 Networks patents	Apr. 12, 2012 Proxy Statement Stockholder Litigation
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