Net Loss per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Earnings Per Share [Abstract]
Net loss attributable to GitLab, basic	$ (52,469)	$ (26,099)
Net loss attributable to GitLab, diluted	$ (52,469)	$ (26,099)
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in shares)	151,692,000	146,643,000
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in shares)	151,692,000	146,643,000
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (0.35)	$ (0.18)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (0.35)	$ (0.18)