Revenue - Schedule of total revenue by geographic areas (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 285,447	$ 181,648
MongoDB Atlas-related
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	169,995	93,510
Other subscription
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	104,586	81,060
Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	10,866	7,078
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	174,056	109,476
Europe, Middle East and Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	81,969	54,725
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 29,422	$ 17,447