Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2015	Aug. 21, 2015	Dec. 31, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	EXTREME NETWORKS INC
Entity Central Index Key	0001078271
Current Fiscal Year End Date	--06-30
Entity Filer Category	Accelerated Filer
Document Type	10-K
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		101,313,823
Entity Current Reporting Status	Yes
Entity Well Known Seasoned Issuer	No
Entity Voluntary Filer	No
Entity Public Float			$ 334.9