Net Loss per Share - Schedule of Earning Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2022	Oct. 31, 2021
Earnings Per Share [Abstract]
Net loss attributable to GitLab, Basic	$ (48,455)	$ (41,227)	$ (133,578)	$ (109,353)
Net loss attributable to GitLab, Diluted	$ (48,455)	$ (41,227)	$ (133,578)	$ (109,353)
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, basic	148,883,000	67,018,000	147,812,000	57,789,000
Weighted-average shares used to compute net loss per share attributable to GitLab Class A and Class B common stockholders, diluted	148,883,000	67,018,000	147,812,000	57,789,000
Net loss per share attributable to GitLab Class A and Class B common stockholders, basic (in USD per share)	$ (0.33)	$ (0.62)	$ (0.90)	$ (1.89)
Net loss per share attributable to GitLab Class A and Class B common stockholders, diluted (in USD per share)	$ (0.33)	$ (0.62)	$ (0.90)	$ (1.89)