Net Loss per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2024	Apr. 30, 2023
Numerator:
Net loss attributable to GitLab, basic	$ (54,644)	$ (52,469)
Net loss attributable to GitLab, diluted	$ (54,644)	$ (52,469)
Denominator:
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in shares)	158,157	151,692
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in shares)	158,157	151,692
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (0.35)	$ (0.35)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (0.35)	$ (0.35)