Net Loss per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Earnings Per Share [Abstract]
Net loss attributable to GitLab, Basic	$ (59,024)	$ (40,189)	$ (85,123)	$ (68,126)
Net loss attributable to GitLab, Diluted	$ (59,024)	$ (40,189)	$ (85,123)	$ (68,126)
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, basic	147,797,000	53,424,000	147,248,000	52,941,000
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, diluted	147,797,000	53,424,000	147,248,000	52,941,000
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (0.40)	$ (0.75)	$ (0.58)	$ (1.29)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (0.40)	$ (0.75)	$ (0.58)	$ (1.29)