Commitment and Contingencies - Schedule of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease costs	$ 33,627	$ 27,711	$ 3,172
Variable lease costs	6,203	5,002	925
Sublease income	(12,779)	(6,026)	0
Total lease costs	$ 27,051	$ 26,687	$ 4,097