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Cover Page - USD ($) $ in Billions	12 Months Ended
Cover Page - USD ($) $ in Billions	Dec. 31, 2021	Feb. 17, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-04321
Entity Registrant Name	ROBLOX Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-0991664
Entity Address, Address Line One	970 Park Place
Entity Address, City or Town	San Mateo
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94403
City Area Code	888
Local Phone Number	858-2569
Title of 12(b) Security	Class A common stock, par value of $0.0001 per share
Trading Symbol	RBLX
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 36.9
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the Registrants’ definitive proxy statement relating to its 2022 annual meeting of shareholders, or the “2022 Proxy Statement”, are incorporated by reference into Part III of this Annual Report on Form 10-K where indicated. The 2022 Proxy Statement will be filed with the U.S. Securities and Exchange Commission within 120 days after the end of the fiscal year to which this report relates.
Entity Central Index Key	0001315098
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false
Document Period End Date	Dec. 31, 2021
Common Class A
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		536,422,071
Common Class B
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		51,337,302