Basis of Presentation and Summary of Significant Accounting Policies - Revision of Previously Issued Consolidated Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Jan. 31, 2025		Jan. 31, 2024		Jan. 31, 2023	Jan. 31, 2022
Consolidated Balance Sheet
Prepaid expenses and other current assets	[1]	$ 40,411		$ 49,143
Total current assets	[1]	1,336,317		1,284,459
TOTAL ASSETS	[1]	1,399,263		1,321,403
Accrued expenses and other current liabilities	[1]	54,680		301,262
Total current liabilities	[1]	545,031		677,157
TOTAL LIABILITIES	[1]	577,957		715,011
Accumulated deficit	[1]	(1,167,614)		(1,161,288)
Accumulated other comprehensive income (loss)	[1]	(8,508)		2,398
Total GitLab stockholders’ equity	[1]	775,909		559,771
Noncontrolling interests	[1]	45,397		46,621
TOTAL STOCKHOLDERS’ EQUITY		821,306	[1]	606,392	[1]	$ 814,501	$ 790,378
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	[1]	1,399,263		1,321,403
Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income
Other income, net		9,187		(12,241)		21,621
Loss before income taxes and loss from equity method investment		(85,793)		(160,567)		(175,294)
Provision for (benefit from) income taxes		(76,674)		265,145		4,030
Net loss		(9,119)		(429,536)		(181,792)
Net loss attributable to GitLab		(6,326)		(425,677)		(173,407)
Foreign currency translation adjustments		(11,934)		(3,937)		(6,111)
Comprehensive loss attributable to GitLab		$ (17,232)		$ (422,452)		$ (182,073)
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)		$ (0.04)		$ (2.76)		$ (1.17)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)		$ (0.04)		$ (2.76)		$ (1.17)
As Previously Reported
Consolidated Balance Sheet
Prepaid expenses and other current assets				$ 45,601
Total current assets				1,280,917
TOTAL ASSETS				1,317,861
Accrued expenses and other current liabilities				286,178
Total current liabilities				662,073
TOTAL LIABILITIES				699,927
Accumulated deficit				(1,149,822)
Accumulated other comprehensive income (loss)				2,335
Total GitLab stockholders’ equity				571,174
Noncontrolling interests				46,760
TOTAL STOCKHOLDERS’ EQUITY				617,934
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY				1,317,861
Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income
Other income, net				(11,826)		$ 21,585
Loss before income taxes and loss from equity method investment				(160,152)		(175,330)
Provision for (benefit from) income taxes				264,057		2,898
Net loss				(428,033)		(180,696)
Net loss attributable to GitLab				(424,174)		(172,311)
Foreign currency translation adjustments				(4,122)		(5,874)
Comprehensive loss attributable to GitLab				$ (421,134)		$ (180,740)
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)				$ (2.75)		$ (1.16)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)				$ (2.75)		$ (1.16)
Adjustment
Consolidated Balance Sheet
Prepaid expenses and other current assets				$ 3,542
Total current assets				3,542
TOTAL ASSETS				3,542
Accrued expenses and other current liabilities				15,084
Total current liabilities				15,084
TOTAL LIABILITIES				15,084
Accumulated deficit				(11,466)
Accumulated other comprehensive income (loss)				63
Total GitLab stockholders’ equity				(11,403)
Noncontrolling interests				(139)
TOTAL STOCKHOLDERS’ EQUITY				(11,542)
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY				3,542
Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income
Other income, net				(415)		$ 36
Loss before income taxes and loss from equity method investment				(415)		36
Provision for (benefit from) income taxes				1,088		1,132
Net loss				(1,503)		(1,096)
Net loss attributable to GitLab				(1,503)		(1,096)
Foreign currency translation adjustments				185		(237)
Comprehensive loss attributable to GitLab				$ (1,318)		$ (1,333)
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)				$ (0.01)		$ (0.01)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)				$ (0.01)		$ (0.01)

[1] (1) As of January 31, 2025 and January 31, 2024, the consolidated balance sheet includes assets of the consolidated variable interest entity, GitLab Information Technology (Hubei) Co., LTD (“JiHu”), of $46.5 million and $51.2 million, respectively, and liabilities of $10.3 million and $10.1 million respectively. The assets of JiHu can be used only to settle obligations of JiHu and creditors of JiHu do not have recourse against the general credit of the Company. Refer to “Note 11. Joint Venture and Equity Method Investment” for further discussion.