Cash Equivalents and Short-Term Investments - Schedule of Cash and Short Term Investments (Details) - USD ($) $ in Thousands		Oct. 31, 2025	Jan. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents	[1]	$ 224,231	$ 227,649
Cash equivalents and short-term investments, amortized cost		1,128,668	897,742
Cash equivalents and short-term investments, gross unrealized gains		1,284	880
Cash equivalents and short-term investments, gross unrealized losses		(154)	(364)
Cash equivalents and short-term investments, fair value		1,129,798	898,258
Level 2
Debt Securities, Available-for-sale [Line Items]
Cash equivalents and short-term investments, amortized cost		988,926	800,649
Cash equivalents and short-term investments, gross unrealized gains		1,284	880
Cash equivalents and short-term investments, gross unrealized losses		(154)	(364)
Cash equivalents and short-term investments, fair value		990,056	801,165
Cash and Cash Equivalents | Level 2
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents		149,718	133,522
Cash equivalents, gross unrealized gains		3	8
Cash equivalents, gross unrealized losses		0	0
Cash equivalents, fair value		149,721	133,530
Short-Term Investments | Level 2
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost		978,950	764,220
Short-term investments, gross unrealized gains		1,281	872
Short-term investments, gross unrealized losses		(154)	(364)
Short-term investments, fair value		980,077	764,728
Money market funds | Cash and Cash Equivalents | Level 1
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents		139,742	97,093
Cash equivalents, fair value		139,742	97,093
U.S. Treasury securities | Cash and Cash Equivalents | Level 2
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents		9,976	36,429
Cash equivalents, gross unrealized gains		3	8
Cash equivalents, gross unrealized losses		0	0
Cash equivalents, fair value		9,979	36,437
U.S. Treasury securities | Short-Term Investments | Level 2
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost		603,372	463,474
Short-term investments, gross unrealized gains		630	521
Short-term investments, gross unrealized losses		(93)	(140)
Short-term investments, fair value		603,909	463,855
Commercial paper | Short-Term Investments | Level 2
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost		17,031	19,400
Short-term investments, gross unrealized gains		3	4
Short-term investments, gross unrealized losses		(2)	(11)
Short-term investments, fair value		17,032	19,393
Corporate debt securities | Short-Term Investments | Level 2
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost		286,065	220,326
Short-term investments, gross unrealized gains		568	327
Short-term investments, gross unrealized losses		(50)	(148)
Short-term investments, fair value		286,583	220,505
U.S. Agency securities | Short-Term Investments | Level 2
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost		72,482	61,020
Short-term investments, gross unrealized gains		80	20
Short-term investments, gross unrealized losses		(9)	(65)
Short-term investments, fair value		72,553	60,975
Cash | Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Short-term investments, amortized cost		$ 74,500	$ 94,100

[1] (1) As of October 31, 2025 and January 31, 2025, the condensed consolidated balance sheet includes assets of the consolidated variable interest entity, GitLab Information Technology (Hubei) Co., LTD (“JiHu”), of $41.6 million and $46.5 million, respectively, and liabilities of $7.2 million and $10.3 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” for further discussion.