Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated deficit
Temporary equity, beginning balance (in shares) at Jan. 31, 2024	74,182,559
Temporary equity, beginning balance at Jan. 31, 2024	$ 714,713
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)	(74,182,559)
Conversion of redeemable convertible preferred stock and founder stock to common stock upon initial public offering	$ (714,713)
Temporary equity, ending balance (in shares) at Apr. 30, 2024	0
Temporary equity, ending balance at Apr. 30, 2024	$ 0
Beginning balance, shares (in shares) at Jan. 31, 2024		61,262,729
Beginning balance at Jan. 31, 2024	(1,419,257)	$ 1	$ 265,494	$ (2,239)	$ (1,682,513)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock option (in shares)		641,537
Issuance of common stock upon exercise of stock options	3,618		3,618
Issuance of common stock upon settlement of restricted stock awards and restricted stock units (in shares)		17,002,721
Issuance of common stock upon settlement of restricted stock units	(411,518)		(411,518)
Conversion of redeemable convertible preferred stock and founder stock to common stock upon initial public offering (in shares)		74,182,559
Conversion of redeemable convertible preferred stock and founder stock to common stock upon initial public offering	714,713	$ 2	714,711
Issuance of common stock upon initial public offering and underwriters' exercise of over-allotment option, net of underwriting discounts and commissions, and offering costs (in shares)		23,500,000
Issuance of common stock upon initial public offering, net of underwriting discounts and commissions, and offering costs	700,011	$ 1	700,010
Stock-based compensation	630,591		630,591
Other comprehensive income (loss)	(665)			(665)
Net loss	(732,091)				(732,091)
Ending balance, shares (in shares) at Apr. 30, 2024		176,589,546
Ending balance at Apr. 30, 2024	(514,598)	$ 4	1,902,906	(2,904)	(2,414,604)
Beginning balance, shares (in shares) at Jan. 31, 2025		189,766,790
Beginning balance at Jan. 31, 2025	$ (553,734)	$ 5	2,291,829	(8,235)	(2,837,333)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock option (in shares)	197,534	197,534
Issuance of common stock upon exercise of stock options	$ 1,875		1,875
Issuance of common stock upon settlement of restricted stock awards and restricted stock units (in shares)		2,923,098
Issuance of common stock upon settlement of restricted stock units	0
Issuance of common stock under employee stock purchase plan (in shares)		494,926
Issuance of common stock under employee stock purchase plan	13,492		13,492
Stock-based compensation	75,149		75,149
Other comprehensive income (loss)	8,792			8,792
Net loss	(102,104)				(102,104)
Ending balance, shares (in shares) at Apr. 30, 2025		193,382,348
Ending balance at Apr. 30, 2025	$ (556,530)	$ 5	$ 2,382,345	$ 557	$ (2,939,437)