CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) shares in Thousands, $ in Thousands	Total	Redeemable Convertible Preferred Stock	Class A and Class B Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit
Redeemable convertible preferred stock, beginning balance (in shares) at Jan. 31, 2021		94,128
Redeemable convertible preferred stock, beginning balance at Jan. 31, 2021		$ 349,113
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)		(94,128)
Conversion of redeemable convertible preferred stock to common stock upon initial public offering		$ (349,113)
Redeemable convertible preferred stock, ending balance (in shares) at Jan. 31, 2022		0
Redeemable convertible preferred stock, ending balance at Jan. 31, 2022		$ 0
Beginning balance (in shares) at Jan. 31, 2021			65,578
Beginning balance at Jan. 31, 2021	$ (121,804)		$ 1	$ 94,159	$ 0	$ (215,964)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares)			94,128
Conversion of redeemable convertible preferred stock to common stock upon initial public offering	349,113		$ 1	349,112
Issuance of common stock upon initial public offering, net of underwriting discounts and issuance costs (in shares)			16,530
Issuance of common stock upon initial public offering, net of underwriting discounts and issuance costs	1,246,925		$ 1	1,246,924
Issuance of common stock for restricted stock awards (in shares)			11
Issuance of common stock upon exercise of stock options (in shares)			2,962
Issuance of common stock upon exercise of stock options	5,036			5,036
Vesting of early exercised stock options	18			18
Issuance of common stock upon settlement of restricted stock units (in shares)			4,355
Tax withholdings on settlement of restricted stock units (in shares)			(1,397)
Tax withholdings on settlement of restricted stock units	(110,989)			(110,989)
Stock-based compensation	204,130			204,130
Other comprehensive loss	0
Net loss	(290,138)					(290,138)
Ending balance (in shares) at Jan. 31, 2022			182,167
Ending balance at Jan. 31, 2022	1,282,291		$ 3	1,788,390	0	(506,102)
Redeemable convertible preferred stock, ending balance (in shares) at Jan. 31, 2023		0
Redeemable convertible preferred stock, ending balance at Jan. 31, 2023		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)			2,856
Issuance of common stock upon exercise of stock options	5,034			5,034
Vesting of early exercised stock options	6			6
Issuance of common stock upon settlement of restricted stock units (in shares)			4,244
Tax withholdings on settlement of restricted stock units (in shares)			(13)
Tax withholdings on settlement of restricted stock units	(248)			(248)
Issuance of common stock under employee stock purchase plan (in shares)			714
Issuance of common stock under employee stock purchase plan	17,197			17,197
Stock-based compensation	175,368			175,368
Other comprehensive loss	0
Net loss	(274,298)					(274,298)
Ending balance (in shares) at Jan. 31, 2023			189,968
Ending balance at Jan. 31, 2023	1,205,350		$ 3	1,985,747	0	(780,400)
Redeemable convertible preferred stock, ending balance (in shares) at Jan. 31, 2024		0
Redeemable convertible preferred stock, ending balance at Jan. 31, 2024		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)			2,934
Issuance of common stock upon exercise of stock options	6,003			6,003
Issuance of common stock upon settlement of restricted stock units (in shares)			5,556
Tax withholdings on settlement of restricted stock units (in shares)			(9)
Tax withholdings on settlement of restricted stock units	(269)			(269)
Issuance of common stock under employee stock purchase plan (in shares)			805
Issuance of common stock under employee stock purchase plan	17,568			17,568
Stock-based compensation	175,402			175,402
Other comprehensive loss	(393)				(393)
Net loss	(190,668)					(190,668)
Ending balance (in shares) at Jan. 31, 2024			199,254
Ending balance at Jan. 31, 2024	$ 1,212,993		$ 3	$ 2,184,451	$ (393)	$ (971,068)