Equity Incentive Plans and Stock-Based Compensation - Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jul. 31, 2025 USD ($) $ / shares shares	Jan. 31, 2025 USD ($) $ / shares shares
Stock Options
Outstanding, beginning balance (in shares) | shares	7,935
Granted (in shares) | shares	2,459
Exercised (in shares) | shares	(1,669)
Forfeited (in shares) | shares	(229)
Outstanding, ending balance (in shares) | shares	8,496	7,935
Weighted-Average Exercise Price
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 0.60
Granted (in dollars per share) | $ / shares	0.10
Exercised (in dollars per share) | $ / shares	0.31
Forfeited (in dollars per share) | $ / shares	0.10
Outstanding, ending balance (in dollars per share) | $ / shares	$ 0.52	$ 0.60
Outstanding, Weighted-Average Remaining Contractual Life (years)	7 years 8 months 12 days	7 years 6 months
Outstanding, Aggregate Intrinsic Value | $	$ 95,428	$ 108,138
Vested and exercisable, Stock Options (in shares) | shares	3,008
Vested and exercisable, Weighted-Average Exercise Price (in dollars per share) | $ / shares	$ 1.28
Vested and exercisable, Weighted-Average Remaining Contractual Life (years)	5 years 8 months 12 days
Vested and exercisable, Aggregate Intrinsic Value | $	$ 31,498