Equity Incentive Plans and Stock-Based Compensation - Option Activity Under Stock Plans (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jan. 31, 2023	Jan. 31, 2022
Stock Options (in thousands)
Outstanding, beginning balance (in shares)	14,544
Granted (in shares)	5,027
Exercised (in shares)	(4,770)
Forfeited (in shares)	(903)
Expired (in shares)	0
Outstanding, ending balance (in shares)	13,898	14,544
Weighted-Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 1.64
Granted (in dollars per share)	6.61
Exercised (in dollars per share)	1.73
Forfeited (in dollars per share)	3.01
Expired (in dollars per share)	0
Outstanding, ending balance (in dollars per share)	$ 3.32	$ 1.64
Outstanding, Weighted-Average Remaining Contractual Life (years)	7 years 8 months 12 days	7 years 7 months 6 days
Outstanding, Aggregate Intrinsic Value	$ 169,324	$ 507,419
Vested and exercisable, Number of Stock Options (in shares)	6,740
Vested and exercisable, Weighted-Average Exercise Price (in dollars per share)	$ 1.87
Vested and exercisable, Weighted-Average Remaining Contractual Life (years)	6 years 3 months 18 days
Vested and exercisable, Aggregate Intrinsic Value	$ 90,911