Income Taxes - Reconciliation of Statutory Federal Income Tax Rate to Effective Income Tax Rate (Details)	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	21.00%	21.00%	21.00%
Foreign taxes	(3.70%)	0.20%	(1.60%)
Non-deductible expenses	(2.70%)	(1.10%)	(0.40%)
Stock-based compensation	27.10%	(14.00%)	(4.30%)
Valuation allowance	(48.20%)	(10.10%)	(15.00%)
Research and development credits	3.80%	6.70%	1.00%
Other, net	(0.20%)	(0.30%)	(1.30%)
Effective income tax rate	(2.90%)	2.40%	(0.60%)