CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Class A and Class B Common Stock Class A and Class B Common Stock
Beginning balance (in shares) at Jan. 31, 2024					304,691,722
Beginning balance at Jan. 31, 2024	$ 1,594,043	$ 2,934,607	$ (1,550)	$ (1,339,044)	$ 30
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					5,671,299
Issuance of common stock upon exercise of stock options	22,888	22,887			$ 1
Vesting of restricted stock units and performance stock units (in shares)					6,906,765
Vesting of restricted stock units and performance stock units	0
Issuance of common stock and assumed options in connection with acquisition (in shares)					2,354,607
Issuance of common stock and assumed options in connection with acquisition	23,739	23,738			$ 1
Issuance of common stock under employee stock purchase plan (in shares)					508,690
Issuance of common stock under employee purchase plan	8,800	8,800
Repurchase of common stock (in shares)					(19,300)
Repurchase of common stock	0
Stock-based compensation	203,569	203,569
Other comprehensive (loss) income	4,137		4,137
Net loss	(217,653)			(217,653)
Ending balance (in shares) at Oct. 31, 2024					320,113,783
Ending balance at Oct. 31, 2024	1,639,523	3,193,601	2,587	(1,556,697)	$ 32
Beginning balance (in shares) at Jul. 31, 2024					315,927,204
Beginning balance at Jul. 31, 2024	1,633,687	3,110,843	1,145	(1,478,333)	$ 32
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					1,850,602
Issuance of common stock upon exercise of stock options	10,075	10,075
Vesting of restricted stock units and performance stock units (in shares)					2,335,977
Stock-based compensation	72,683	72,683
Other comprehensive (loss) income	1,442		1,442
Net loss	(78,364)			(78,364)
Ending balance (in shares) at Oct. 31, 2024					320,113,783
Ending balance at Oct. 31, 2024	1,639,523	3,193,601	2,587	(1,556,697)	$ 32
Beginning balance (in shares) at Jan. 31, 2025					325,579,105
Beginning balance at Jan. 31, 2025	1,669,247	3,294,542	2,158	(1,627,485)	$ 32
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					3,537,247
Issuance of common stock upon exercise of stock options	16,610	16,610
Vesting of restricted stock units and performance stock units (in shares)					8,964,751
Vesting of restricted stock units and performance stock units	1				$ 1
Issuance of common stock and assumed options in connection with acquisition (in shares)					6,818,255
Issuance of common stock and assumed options in connection with acquisition	71,641	71,640			$ 1
Issuance of common stock under employee stock purchase plan (in shares)					578,154
Issuance of common stock under employee purchase plan	9,065	9,065
Repurchase of common stock (in shares)					(5,726,101)
Repurchase of common stock	(101,942)	(101,942)
Stock-based compensation	225,266	225,266
Other comprehensive (loss) income	537		537
Net loss	(340,503)			(340,503)
Ending balance (in shares) at Oct. 31, 2025					339,751,411
Ending balance at Oct. 31, 2025	1,549,922	3,515,181	2,695	(1,967,988)	$ 34
Beginning balance (in shares) at Jul. 31, 2025					332,134,512
Beginning balance at Jul. 31, 2025	1,507,786	3,414,117	1,333	(1,907,697)	$ 33
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					337,275
Issuance of common stock upon exercise of stock options	1,381	1,381
Vesting of restricted stock units and performance stock units (in shares)					3,226,573
Vesting of restricted stock units and performance stock units	0
Issuance of common stock and assumed options in connection with acquisition (in shares)					6,818,255
Issuance of common stock and assumed options in connection with acquisition	71,641	71,640			$ 1
Repurchase of common stock (in shares)					(2,765,204)
Repurchase of common stock	(49,249)	(49,249)
Stock-based compensation	77,292	77,292
Other comprehensive (loss) income	1,362		1,362
Net loss	(60,291)			(60,291)
Ending balance (in shares) at Oct. 31, 2025					339,751,411
Ending balance at Oct. 31, 2025	$ 1,549,922	$ 3,515,181	$ 2,695	$ (1,967,988)	$ 34