Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Jun. 30, 2019	Aug. 23, 2019	Dec. 31, 2018
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	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Document Type	10-K
Document Period End Date	Jun. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Trading Symbol	EXTR
Amendment Flag	false
Entity Common Stock, Shares Outstanding		120,775,356
Entity Current Reporting Status	Yes
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 0.5
Entity Address, State or Province	California
Entity File Number	000-25711
Entity Tax Identification Number	770430270
Entity Address, Address Line One	6480 Via del Oro
Entity Address, City or Town	San Jose
Entity Address, Postal Zip Code	95119
City Area Code	408
Local Phone Number	579-2800