Net Loss per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021
Earnings Per Share [Abstract]
Net loss attributable to GitLab, basic	$ (172,311)	$ (155,138)	$ (192,194)
Net loss attributable to GitLab, diluted	$ (172,311)	$ (155,138)	$ (192,194)
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in shares)	148,407	79,755	50,343
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in shares)	148,407	79,755	50,343
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (1.16)	$ (1.95)	$ (3.82)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (1.16)	$ (1.95)	$ (3.82)