Revenue - Schedule of total revenue by geographic areas (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2025	Apr. 30, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 549,014	$ 450,561
MongoDB Atlas-related
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	395,893	313,855
Other subscription
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	135,562	123,041
Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	17,559	13,665
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	332,867	272,093
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	150,766	123,296
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 65,381	$ 55,172