Commitments, Contingencies and Leases (Narratives) (Details) (USD $)	12 Months Ended							3 Months Ended				0 Months Ended	3 Months Ended			0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jul. 03, 2011	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	Dec. 31, 2012 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	Jul. 06, 2001 Securities Fraud Class Action Complaints Versus Extreme Networks Employees	Jun. 30, 2012 Pending Litigation Patent Infringement Litigation Versus Chrismar Systems, Inc.	Jun. 30, 2012 Pending Litigation Minimum Patent Infringement Litigation Versus Chrismar Systems, Inc.	Jun. 30, 2012 Pending Litigation Maximum Patent Infringement Litigation Versus Chrismar Systems, Inc.	Jul. 25, 2013 Subsequent Event Patent Infringement Litigation Versus Chrismar Systems, Inc.
Loss Contingencies [Line Items]
Net rent expense	$ 5,900,000	$ 4,300,000	$ 4,300,000
Non-cancelable purchase commitments	50,100,000
Number of patents owned (in patents)						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											200,000
Proceeds from legal settlements								400,000	600,000
Number of current and former employees named in complaint (in employees)												6
Estimate for range of loss of litigation														300,000	1,400,000
Amount capitalized for patents subject to litigation													1,200,000
Recorded estimate for probably loss for litigation													300,000
Amount paid to defendant for patent license fees in settlement agreement																$ 1,400,000