Basis of Presentation and Summary of Significant Accounting Policies - Revision of Previously Issued Consolidated Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income
Other income (expense), net	$ (6,334)	$ 4,799	$ (17,216)	$ 5,170
Loss before income taxes	(6,986)	(11,347)	(48,456)	(80,764)
Provision for (benefit from) income taxes	1,811	(39,152)	6,595	(65,330)
Net income (loss)	(8,797)	27,805	(55,051)	(15,434)
Net income (loss) attributable to GitLab	(8,276)	29,103	(53,359)	(13,218)
Foreign currency translation adjustments	1,751	(5,792)	10,070	(8,348)
Comprehensive income (loss) attributable to GitLab	$ (4,809)	23,382	$ (42,895)	(20,714)
As Previously Reported
Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income
Other income (expense), net		4,992		5,457
Loss before income taxes		(11,154)		(80,477)
Provision for (benefit from) income taxes		(39,421)		(66,131)
Net income (loss)		28,267		(14,346)
Net income (loss) attributable to GitLab		29,565		(12,130)
Foreign currency translation adjustments		(5,637)		(8,183)
Comprehensive income (loss) attributable to GitLab		23,999		(19,461)
Adjustment
Consolidated Statements of Operations and Consolidated Statements of Comprehensive Income
Other income (expense), net		(193)		(287)
Loss before income taxes		(193)		(287)
Provision for (benefit from) income taxes		269		801
Net income (loss)		(462)		(1,088)
Net income (loss) attributable to GitLab		(462)		(1,088)
Foreign currency translation adjustments		(155)		(165)
Comprehensive income (loss) attributable to GitLab		$ (617)		$ (1,253)