Net Income (Loss) per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2024	Jul. 31, 2023
Numerator:
Net income (loss) attributable to GitLab	$ 12,949	$ (50,080)	$ (41,695)	$ (102,549)
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)	159,677	153,644	158,973	152,683
Weighted-average shares used to compute net income (loss) per share attributable to GitLab Class A and Class B common stockholders, diluted (in shares)	166,346	153,644	158,973	152,683
Net income (loss) per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ 0.08	$ (0.33)	$ (0.26)	$ (0.67)
Net income (loss) per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ 0.08	$ (0.33)	$ (0.26)	$ (0.67)
Stock options
Denominator:
Dilutive impact of options and restrictive stock units (in shares)	$ 5,452	$ 0	$ 0	$ 0
RSUs
Denominator:
Dilutive impact of options and restrictive stock units (in shares)	1,166	0	0	0
ESPP
Denominator:
Dilutive impact of options and restrictive stock units (in shares)	$ 51	$ 0	$ 0	$ 0