Equity - Narrative (Details)			1 Months Ended		3 Months Ended		12 Months Ended
	Feb. 01, 2022 shares	Oct. 18, 2021 USD ($) $ / shares shares	Sep. 30, 2021 target shares	May 31, 2021 USD ($) target $ / shares shares	Apr. 30, 2021	Apr. 30, 2016	Jan. 31, 2022 USD ($) vote $ / shares shares		Jan. 31, 2021 USD ($) $ / shares shares	Jan. 31, 2020 USD ($) $ / shares shares	Oct. 17, 2021 USD ($) shares	Jan. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares authorized (in shares) | shares		50,000,000					50,000,000		0
Preferred stock, par value (in USD per share) | $ / shares		$ 0.0000025					$ 0.0000025		$ 0.0000025
Proceeds from initial public offering, net of underwriting discounts							$ 654,552,000		$ 0	$ 0
Payments of deferred offering costs		$ 4,700,000					$ 4,667,000		$ 0	$ 0
Deferred offering costs											$ 4,700,000
Shares subject to repurchase obligation (in shares) | shares							713,967		1,197,150
Deferred compensation liability, noncurrent							$ 6,800,000		$ 8,100,000
Convertible preferred stock, shares outstanding (in shares) | shares		79,600,000					0		79,551,000	79,959,000	79,600,000	65,546,000
Carrying value of convertible preferred stock							$ 0	[1]	$ 424,904,000	$ 425,146,000	$ 424,904,000	$ 156,969,000
Award vesting period (in years)							4 years
Additional shares added (in shares) | shares							22,532,000		5,788,000
Aggregate intrinsic value, options vested							$ 10,800,000		$ 8,200,000	$ 1,800,000
Options granted (in USD per share) | $ / shares							$ 10.81		$ 3.55	$ 2.04
Intrinsic value of options exercised							$ 280,500,000		$ 33,800,000	$ 16,000,000
Compensation expense not yet recognized							101,800,000		26,800,000
Stock-based compensation							29,665,000		8,024,000	3,702,000
Tax benefit for stock-based compensation expense							$ 7,000,000		$ 0	$ 0
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares) | shares		1,500,000,000					1,500,000,000		163,000,000
Common stock, par value (in USD per share) | $ / shares		$ 0.0000025					$ 0.0000025		$ 0.0000025
Voting rights, vote per share | vote							1
Class A Common Stock | IPO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares sold (in shares) | shares		8,940,000
Share price (in USD per share) | $ / shares		$ 77.00
Proceeds from initial public offering, net of underwriting discounts		$ 654,600,000
Payments of deferred offering costs		$ 33,800,000
Class A Common Stock | Over-Allotment Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares sold (in shares) | shares		520,000
Class A Common Stock | IPO, Shares From Existing Stockholder
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares sold (in shares) | shares		2,500,000
Proceeds from initial public offering, net of underwriting discounts		$ 0
Class B Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares authorized (in shares) | shares		250,000,000					250,000,000		163,000,000
Common stock, par value (in USD per share) | $ / shares		$ 0.0000025					$ 0.0000025		$ 0.0000025
Voting rights, vote per share | vote							10
2021 Equity Incentive Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares) | shares			13,032,289
2021 Equity Incentive Plan | Class A Common Stock | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares added (in shares) | shares	7,344,382
Shares subject to the 2021 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield							0.00%
Risk-free interest rate							0.07%
Shares subject to the 2021 ESPP | 2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)							3 months 18 days
Compensation expense not yet recognized							$ 6,900,000
Stock-based compensation							$ 5,100,000
Discount rate (as a percent)			15.00%
Look-back period (in months)			27 months
Shares subject to the 2021 ESPP | 2021 Employee Stock Purchase Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares) | shares			3,271,090
Automatic annual increase period (in years)			10 years
Shares subject to the 2021 ESPP | 2021 Employee Stock Purchase Plan | Class A Common Stock | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares added (in shares) | shares	1,468,876
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)					1 year 3 months 18 days		2 years 3 months 18 days
Dividend yield							0.00%		0.00%	0.00%
Risk-free interest rate							1.10%		0.50%	1.90%
Stock options | 2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period (in years)						10 years
Stock options | 2015 Equity Incentive Plan | Period one
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage						25.00%
Award vesting period (in years)						1 year
Stock options | 2015 Equity Incentive Plan | Period two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)						36 months
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted in period (in shares) | shares							3,290,000		0
RSUs | Chief Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted in period (in shares) | shares				3,000,000
Grant date fair value				$ 8,800,000
Share price volatility (as a percent)				45.00%
Risk-free interest rate				1.52%
Number of threshold stock price targets | target			8	8
Compensation expense not yet recognized				$ 8,800,000			$ 7,600,000
Stock-based compensation							$ 1,200,000
RSUs | Chief Executive Officer | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)				2 years 9 months 29 days
Threshold stock price target (in USD per share) | $ / shares				$ 95
RSUs | Chief Executive Officer | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for recognition (in years)				7 years 6 months
Threshold stock price target (in USD per share) | $ / shares				$ 500
RSUs | 2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs granted in period (in shares) | shares							300,000
RSU grant date fair value (in dollars per share) | $ / shares							$ 82.10
RSUs | 2021 Equity Incentive Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)							2 years
RSUs | 2021 Equity Incentive Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)							4 years

[1] (1) As of January 31, 2022, the consolidated balance sheet includes assets and liabilities of the consolidated variable interest entity, GitLab Information Technology (Hubei) Co., LTD (“JiHu”), of $17.7 million and $3.7 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 10. Joint Venture and Majority Owned Subsidiary” for further discussion.