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, 2022	74,182,559
Temporary equity, beginning balance at Jan. 31, 2022	$ 714,713
Temporary equity, ending balance (in shares) at Jan. 31, 2023	74,182,559
Temporary equity, ending balance at Jan. 31, 2023	$ 714,713
Beginning balance, shares (in shares) at Jan. 31, 2022		59,156,335
Beginning balance at Jan. 31, 2022	$ (819,342)	$ 1	$ 231,354	$ (88)	$ (1,050,609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	669,122	669,122
Issuance of common stock upon exercise of stock options	$ 3,809		3,809
Repurchases of unvested common stock (in shares)		(750)
Vesting of early exercise stock options	164		164
Issuance of common stock upon settlement of restricted stock units (in shares)		54,010
Stock-based compensation	6,999		6,999
Other comprehensive loss	(1,213)			(1,213)
Net loss	(277,746)				(277,746)
Ending balance, shares (in shares) at Jan. 31, 2023		59,878,717
Ending balance at Jan. 31, 2023	$ (1,087,329)	$ 1	242,326	(1,301)	(1,328,355)
Temporary equity, ending balance (in shares) at Jan. 31, 2024	74,182,559
Temporary equity, ending balance at Jan. 31, 2024	$ 714,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	884,012	884,012
Issuance of common stock upon exercise of stock options	$ 3,383		3,383
Issuance of common stock for business acquisition (in shares)		500,000
Issuance of common stock for business acquisition	14,070		14,070
Stock-based compensation	5,715		5,715
Other comprehensive loss	(938)			(938)
Net loss	(354,158)				(354,158)
Ending balance, shares (in shares) at Jan. 31, 2024		61,262,729
Ending balance at Jan. 31, 2024	$ (1,419,257)	$ 1	265,494	(2,239)	(1,682,513)
Increase (Decrease) in Temporary Equity [Roll Forward]
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)
Temporary equity, ending balance (in shares) at Jan. 31, 2025	0
Temporary equity, ending balance at Jan. 31, 2025	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	1,548,712	1,548,712
Issuance of common stock upon exercise of stock options	$ 8,516		8,516
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)		26,972,252
Issuance of common stock upon initial public offering and underwriters' exercise of over-allotment option, net of underwriting discounts and commissions, and offering costs	805,135	$ 1	805,134
Issuance of common stock upon settlement of restricted stock units (in shares)		25,393,769
Issuance of common stock upon settlement of restricted stock units	(432,512)	$ 1	(432,513)
Issuance of common stock under employee stock purchase plan (in shares)		406,769
Issuance of common stock under employee stock purchase plan	11,064		11,064
Stock-based compensation	919,423		919,423
Other comprehensive loss	(5,996)			(5,996)
Net loss	(1,154,820)				(1,154,820)
Ending balance, shares (in shares) at Jan. 31, 2025		189,766,790
Ending balance at Jan. 31, 2025	$ (553,734)	$ 5	$ 2,291,829	$ (8,235)	$ (2,837,333)