Significant Accounting Policies - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 725,289	$ 541,643	$ 389,719
United States
Disaggregation of Revenue [Line Items]
Total revenues	436,079	338,084	248,107
Foreign countries
Disaggregation of Revenue [Line Items]
Total revenues	$ 289,210	$ 203,559	$ 141,612