Net Income (Loss) per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Numerator:
Net income (loss) attributable to GitLab	$ (8,276)	$ 29,103	$ (53,359)	$ (13,218)
Denominator:
Weighted-average shares used to compute net income (loss) per share attributable to GitLab Class A and Class B common stockholders, basic (in shares)	167,407	161,317	165,965	159,756
Effect of dilutive securities:
Dilutive impact of common stock in connection with business combination (in shares)	0	22	0	0
Weighted-average shares used to compute net income (loss) per share attributable to GitLab Class A and Class B common stockholders, diluted (in shares)	167,407	167,436	165,965	159,756
Net income (loss) per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (0.05)	$ 0.18	$ (0.32)	$ (0.08)
Net income (loss) per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (0.05)	$ 0.17	$ (0.32)	$ (0.08)
Stock options
Effect of dilutive securities:
Dilutive impact of stock options, restrictive stock units and ESPP (in shares)	0	4,897	0	0
RSUs
Effect of dilutive securities:
Dilutive impact of stock options, restrictive stock units and ESPP (in shares)	0	1,102	0	0
Employee Stock
Effect of dilutive securities:
Dilutive impact of stock options, restrictive stock units and ESPP (in shares)	0	98	0	0