Net Loss per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Earnings Per Share [Abstract]
Net loss attributable to GitLab, Basic	$ (26,099)	$ (27,937)
Net loss attributable to GitLab, Diluted	$ (26,099)	$ (27,937)
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, basic	146,643,000	52,744,000
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, diluted	146,643,000	52,744,000
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (0.18)	$ (0.53)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (0.18)	$ (0.53)