Revenue and Performance Obligations - Summary of Revenue By Region Based On The Billing Address of Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Total Revenue	$ 320,769	$ 211,854	$ 121,261
Revenue | Region
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of Total Revenue	100.00%	100.00%	100.00%
US [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total Revenue	$ 235,428	$ 157,916	$ 92,771
US [Member] | Revenue | Region
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of Total Revenue	73.00%	75.00%	77.00%
Rest of the world [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Total Revenue	$ 85,341	$ 53,938	$ 28,490
Rest of the world [Member] | Revenue | Region
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of Total Revenue	27.00%	25.00%	23.00%