Revenue - Schedule of total revenue by geographic areas (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 303,660	$ 198,747	$ 589,107	$ 380,395
MongoDB Atlas-related
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	193,354	111,756	363,349	205,267
Other subscription
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	98,253	79,625	202,839	160,684
Services
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	12,053	7,366	22,919	14,444
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	185,796	120,827	359,852	230,303
EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	84,627	57,582	166,596	112,307
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 33,237	$ 20,338	$ 62,659	$ 37,785