Joint Venture and Equity Method Investment - Narrative (Details) $ in Thousands	12 Months Ended
	Jan. 31, 2025 USD ($) lease	Jan. 31, 2024 USD ($)	Jan. 31, 2023 USD ($)
Noncontrolling Interest [Line Items]
Total stock-based compensation expense (gain)	$ 185,899	$ 163,049	$ 122,567
Operating lease, number of leases entered into | lease	3
Operating lease, total lease payments	$ 400
Operating lease liabilities	400
Short-term lease, cost	100	0	0
Operating lease expense	400	600	600
Impairment of equity method investment	0	8,858	0
Equity method investment		0
Loss from equity method investment, net of tax	0	3,824	2,468
Arch (Meltano Inc.)
Noncontrolling Interest [Line Items]
Loss from equity method investment, net of tax		3,800	2,500
GitLab Information Technology (Hubei) Co., LTD ("JiHu")
Noncontrolling Interest [Line Items]
Total stock-based compensation expense (gain)	1,800	$ (1,500)	$ 7,800
Compensation expense not yet recognized	$ 7,100
Period for recognition (in years)	3 years 9 months 18 days
GitLab Information Technology (Hubei) Co., LTD ("JiHu")
Noncontrolling Interest [Line Items]
Ownership percentage	54.00%	54.00%