Revenue, Accounts Receivable, Deferred Revenue and Remaining Performance Obligations - Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 1,219,327	$ 592,049	$ 264,748
United States
Disaggregation of Revenue [Line Items]
Revenue	977,077	499,590	233,828
Other
Disaggregation of Revenue [Line Items]
Revenue	26,324	9,480	2,537
EMEA
Disaggregation of Revenue [Line Items]
Revenue	169,268	66,813	22,388
Asia-Pacific and Japan
Disaggregation of Revenue [Line Items]
Revenue	$ 46,658	$ 16,166	$ 5,995