Joint Venture and Equity Method Investment - Narrative (Details) $ in Thousands, shares in Millions			1 Months Ended		3 Months Ended		12 Months Ended
		Apr. 04, 2022 USD ($)	Mar. 31, 2022 USD ($) day	Apr. 30, 2021 USD ($)	Apr. 30, 2023 USD ($) shares	Apr. 30, 2022 USD ($)	Jan. 31, 2023 USD ($)	Jan. 31, 2022
Noncontrolling Interest [Line Items]
Total stock-based compensation expense					$ 32,330	$ 17,471
Operating lease expense					$ 200	100
Operating lease, remaining term (in years)					3 years
Operating lease, total lease payments					$ 1,500
Operating lease liabilities					1,400
Contributions received from noncontrolling interests, net of issuance costs					0	35,528
Decrease from deconsolidation						11,342
Gain from deconsolidation of Meltano Inc.					0	17,798
Equity method investment	[1]				11,735		$ 12,682
Loss from equity method investment, net of tax					748	203
Noncontrolling Interests
Noncontrolling Interest [Line Items]
Decrease from deconsolidation						11,342
Meltano Inc.
Noncontrolling Interest [Line Items]
Gain from deconsolidation of Meltano Inc.						17,800
Equity method investment					11,700
Loss from equity method investment, net of tax					$ 700	200
Stake in equity method investment (as a percent)					96.00%
Meltano Inc. | Employee stock options
Noncontrolling Interest [Line Items]
Potentially dilutive equity instruments (in shares) | shares					3.1
Meltano Inc. | Preferred Stock
Noncontrolling Interest [Line Items]
Stake in equity method investment (as a percent)					48.00%
Potentially dilutive equity instruments (in shares) | shares					3.1
Meltano Inc. | Noncontrolling Interests
Noncontrolling Interest [Line Items]
Decrease in net assets upon consolidation		$ 9,400
Decrease from deconsolidation		11,300
Meltano Inc. | Accumulated Deficit
Noncontrolling Interest [Line Items]
Decrease from deconsolidation		15,900
GitLab Information Technology (Hubei) Co., LTD ("JiHu")
Noncontrolling Interest [Line Items]
Ownership percentage					55.00%		55.00%	72.00%
Meltano Inc.
Noncontrolling Interest [Line Items]
Loan payable, period (in days)				$ 400
Ownership percentage by noncontrolling owners				12.00%
GitLab Information Technology (Hubei) Co., LTD ("JiHu")
Noncontrolling Interest [Line Items]
Consideration received on transaction, net							$ 54,600
Total stock-based compensation expense					$ (2,500)	$ 200
Compensation expense not yet recognized					$ 6,100
Period for recognition (in years)					3 years
GitLab Information Technology (Hubei) Co., LTD ("JiHu") | Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Loans payable			$ 2,900
Loan payable, period (in days) | day			10
Meltano Inc.
Noncontrolling Interest [Line Items]
Consideration received on transaction, net		$ 7,200
Contributions received from noncontrolling interests, net of issuance costs				$ 4,200

[1] (1) As of April 30, 2023 and January 31, 2023, the condensed consolidated balance sheet includes assets of the consolidated variable interest entity, GitLab Information Technology (Hubei) Co., LTD (“JiHu”), of $57.0 million and $62.8 million, respectively, and liabilities of $7.7 million and $8.9 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 12. Joint Venture and Equity Method Investment” for further discussion.