Revenue - Schedule of total revenue by geographic areas (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 529,375	$ 432,938	$ 1,458,045	$ 1,225,009
MongoDB Atlas-related
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	362,604	286,856	1,016,142	791,870
Other subscription
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	149,601	131,483	396,764	390,517
Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	17,170	14,599	45,139	42,622
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	325,076	265,698	881,958	741,529
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	140,744	119,355	400,864	337,924
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 63,555	$ 47,885	$ 175,223	$ 145,556