Net Income (Loss) per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Numerator:
Net loss attributable to GitLab	$ (6,326)	$ (425,677)	$ (173,407)
Denominator:
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in shares)	160,580	154,283	148,407
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in shares)	160,580	154,283	148,407
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (0.04)	$ (2.76)	$ (1.17)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (0.04)	$ (2.76)	$ (1.17)