Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified						3 Months Ended
	Mar. 31, 2013	May 05, 2008 Patent Infringement Litigation Versus Extreme Networks Patents	Apr. 09, 2008 Patent Infringement Litigation Versus Extreme Networks Patents	May 30, 2007 Patent Infringement Litigation Versus Extreme Networks Patents	Jun. 21, 2005 Patent Infringement Litigation Versus Extreme Networks Patents	Mar. 31, 2013 Patent Infringement Litigation Versus Enterasys	Jun. 30, 2012 Patent Infringement Litigation Versus Enterasys	May 30, 2008 Patent Infringement Litigation Versus Enterasys Patents	May 30, 2008 Patent Infringement Litigation Versus Enterasys Positive Outcome of Litigation	Jun. 30, 2012 Patent Infringement Litigation Versus Chrismar Systems, Inc. Pending Litigation	Jun. 30, 2012 Patent Infringement Litigation Versus Chrismar Systems, Inc. Pending Litigation Minimum	Jun. 30, 2012 Patent Infringement Litigation Versus Chrismar Systems, Inc. Pending Litigation Maximum
Loss Contingencies [Line Items]
Non-cancelable purchase commitments	$ 30.3
Number of patents owned				3	6
Patents owned in petition for reexamination (in patents)					5
Patents associated with dismissed litigation (in patents)		2	1		2
Patents associated with successful litigation (in patents)								3
Amount awarded by court									0.2
Proceeds from legal settlement						0.4	0.6
Estimate for range of loss of litigation										$ 0.3	$ 0.3	$ 1.4