Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Jun. 30, 2020	Aug. 25, 2020	Dec. 31, 2019
Cover [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, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Title of 12(b) Security	Common Stock, par value $0.001 per share
Security Exchange Name	NASDAQ
Trading Symbol	EXTR
Amendment Flag	false
Entity Common Stock, Shares Outstanding		122,544,308
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Public Float			$ 0.7
Entity Address, State or Province	CA
Entity File Number	000-25711
Entity Tax Identification Number	77-0430270
Entity Address, Address Line One	6480 Via del Oro
Entity Address, City or Town	San Jose
Entity Incorporation, State or Country Code	DE
Entity Address, Postal Zip Code	95119
City Area Code	408
Local Phone Number	579-2800
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	Portions of the registrant's definitive proxy statement for the year ended June 30, 2020 Annual Meeting of Stockholders to be filed with the Commission pursuant to Regulation 14A not later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K are incorporated herein by reference in Part III of this Annual Report on Form 10-K.