Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit - USD ($) $ in Thousands	Total	Tax of Settlement	Common stock	Common stock Tax of Settlement	Additional paid-in capital	Additional paid-in capital Tax of Settlement	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 Jul. 31, 2024	0
Temporary equity, ending balance at Jul. 31, 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]
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 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 exercise of stock option (in shares)			680,400
Issuance of common stock upon exercise of stock options	3,718				3,718
Issuance of common stock upon settlement of restricted stock awards and restricted stock units (in shares)			18,324,878
Issuance of common stock upon settlement of restricted stock units	(432,512)				(432,512)
Stock-based compensation	737,329				737,329
Other comprehensive income (loss)	601						601
Net loss	(909,021)							(909,021)
Ending balance, shares (in shares) at Jul. 31, 2024			181,422,818
Ending balance at Jul. 31, 2024	$ (499,294)		$ 4		2,093,874		(1,638)	(2,591,534)
Temporary equity, ending balance (in shares) at Jul. 31, 2024	0
Temporary equity, ending balance at Jul. 31, 2024	$ 0
Beginning balance, shares (in shares) at Apr. 30, 2024			176,589,546
Beginning balance at Apr. 30, 2024	(514,598)		$ 4		1,902,906		(2,904)	(2,414,604)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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)			3,472,252
Issuance of common stock upon underwriters' exercise of over-allotment option, net of underwriting discounts and commissions, and offering costs	105,124				105,124
Issuance of common stock upon exercise of stock option (in shares)			38,863
Issuance of common stock upon exercise of stock options	100				100
Issuance of common stock upon settlement of restricted stock awards and restricted stock units (in shares)			1,322,157
Issuance of common stock upon settlement of restricted stock units	(20,994)				(20,994)
Stock-based compensation	106,738				106,738
Other comprehensive income (loss)	1,266						1,266
Net loss	(176,930)							(176,930)
Ending balance, shares (in shares) at Jul. 31, 2024			181,422,818
Ending balance at Jul. 31, 2024	(499,294)		$ 4		2,093,874		(1,638)	(2,591,534)
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)	437,882		437,882
Issuance of common stock upon exercise of stock options	$ 3,108				3,108
Issuance of common stock upon settlement of restricted stock awards and restricted stock units (in shares)			5,227,643
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
Issuable common stock for business combination, net of tax settlement (in shares)				1,462,215
Issuance of common stock for business combination, net of settlement for tax withholding		$ 88,233				$ 88,233
Purchase of capped calls related to convertible senior notes	(88,550)				(88,550)
Stock-based compensation	165,485				165,485
Other comprehensive income (loss)	5,655						5,655
Net loss	(198,033)							(198,033)
Ending balance, shares (in shares) at Jul. 31, 2025			197,389,456
Ending balance at Jul. 31, 2025	(564,344)		$ 5		2,473,597		(2,580)	(3,035,366)
Beginning balance, shares (in shares) at Apr. 30, 2025			193,382,348
Beginning balance at Apr. 30, 2025	(556,530)		$ 5		2,382,345		557	(2,939,437)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock option (in shares)			240,348
Issuance of common stock upon exercise of stock options	1,233				1,233
Issuance of common stock upon settlement of restricted stock awards and restricted stock units (in shares)			2,304,545
Issuance of common stock upon settlement of restricted stock units	0
Issuable common stock for business combination, net of tax settlement (in shares)				1,462,215
Issuance of common stock for business combination, net of settlement for tax withholding		$ 88,233				$ 88,233
Purchase of capped calls related to convertible senior notes	(88,550)				(88,550)
Stock-based compensation	90,336				90,336
Other comprehensive income (loss)	(3,137)						(3,137)
Net loss	(95,929)							(95,929)
Ending balance, shares (in shares) at Jul. 31, 2025			197,389,456
Ending balance at Jul. 31, 2025	$ (564,344)		$ 5		$ 2,473,597		$ (2,580)	$ (3,035,366)