Cover - USD ($) $ in Billions	12 Months Ended
Cover - USD ($) $ in Billions	Jun. 30, 2026	Aug. 07, 2026	Dec. 31, 2025
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 30, 2026
Current Fiscal Year End Date	--06-30
Document Transition Report	false
Entity File Number	001-37651
Entity Registrant Name	Atlassian Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	88-3940934
Entity Address, Address Line One	350 Bush Street
Entity Address, Address Line Two	Floor 13
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94104
City Area Code	415
Local Phone Number	701-1110
Title of 12(b) Security	Class A Common Stock, par value $0.00001 per share
Trading Symbol	TEAM
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 27.6
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement relating to its 2026 Annual Meeting of Stockholders (the “Proxy Statement”), to be filed within 120 days of the registrant’s fiscal year ended June 30, 2026, are incorporated by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Except with respect to information specifically incorporated by reference in this Annual Report on Form 10-K, the Proxy Statement is not deemed to be filed as part of this Annual Report on Form 10-K.
Entity Central Index Key	0001650372
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	FY
Amendment Flag	false
Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		159,005,198
Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		94,133,617