Cover - USD ($) shares in Millions, $ in Billions	12 Months Ended
	Jan. 31, 2022	Apr. 01, 2022	Oct. 14, 2021
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jan. 31, 2022
Document Transition Report	false
Entity File Number	001-40895
Entity Registrant Name	GITLAB INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-1861035
Title of 12(b) Security	Class A common stock, par value $0.0000025per share
Trading Symbol	GTLB
Security Exchange Name	NASDAQ
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	true
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Entity Shell Company	false
Entity Public Float			$ 7.3
Documents Incorporated by Reference	Portions of the registrant’s Definitive Proxy Statement (“Proxy Statement”) relating to the 2022 Annual Meeting of Stockholders will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended January 31, 2022 and is incorporated by reference into Part III of this Report.
Entity Central Index Key	0001653482
Current Fiscal Year End Date	--01-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Address, Address Line One	251 Little Falls Drive
Entity Address, City or Town	Wilmington
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19808
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		52.3
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		95.3