Net 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, 2023	Oct. 31, 2022	Oct. 31, 2023	Oct. 31, 2022
Earnings Per Share [Abstract]
Net loss attributable to GitLab, basic	$ (285,158)	$ (48,455)	$ (387,707)	$ (133,578)
Net loss attributable to GitLab, diluted	$ (285,158)	$ (48,455)	$ (387,707)	$ (133,578)
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in shares)	155,123	148,883	153,504	147,812
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in shares)	155,123	148,883	153,504	147,812
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (1.84)	$ (0.33)	$ (2.53)	$ (0.90)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (1.84)	$ (0.33)	$ (2.53)	$ (0.90)