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)					3,820,697
Issuance of common stock upon exercise of stock options	12,813	12,812			$ 1
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
Vesting of restricted stock units and performance stock units (in shares)					4,570,788
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)
Stock-based compensation	$ 130,886	130,886
Other comprehensive income (loss)	2,695		2,695
Net loss	(139,289)			(139,289)
Ending balance (in shares) at Jul. 31, 2024					315,927,204
Ending balance at Jul. 31, 2024	1,633,687	3,110,843	1,145	(1,478,333)	$ 32
Beginning balance (in shares) at Apr. 30, 2024					311,556,289
Beginning balance at Apr. 30, 2024	1,615,620	3,027,530	(2,793)	(1,409,149)	$ 32
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					1,475,181
Issuance of common stock upon exercise of stock options	6,258	6,258			$ 0
Vesting of restricted stock units and performance stock units (in shares)					2,387,044
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
Stock-based compensation	68,255	68,255
Other comprehensive income (loss)	3,938		3,938
Net loss	(69,184)			(69,184)
Ending balance (in shares) at Jul. 31, 2024					315,927,204
Ending balance at Jul. 31, 2024	1,633,687	3,110,843	1,145	(1,478,333)	$ 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)					3,199,972
Issuance of common stock upon exercise of stock options	15,229	15,229
Vesting of restricted stock units and performance stock units (in shares)					5,738,178
Vesting of restricted stock units and performance stock units	1				$ 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)	(2,960,897)
Repurchase of common stock	$ (52,693)	(52,693)
Stock-based compensation	147,974	147,974
Other comprehensive income (loss)	(825)		(825)
Net loss	(280,212)			(280,212)
Ending balance (in shares) at Jul. 31, 2025					332,134,512
Ending balance at Jul. 31, 2025	1,507,786	3,414,117	1,333	(1,907,697)	$ 33
Beginning balance (in shares) at Apr. 30, 2025					331,072,169
Beginning balance at Apr. 30, 2025	1,546,542	3,378,134	4,053	(1,835,678)	$ 33
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					678,982
Issuance of common stock upon exercise of stock options	2,952	2,952
Vesting of restricted stock units and performance stock units (in shares)					2,766,104
Vesting of restricted stock units and performance stock units	0				$ 0
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)	(2,960,897)
Repurchase of common stock	$ (52,693)	(52,693)
Stock-based compensation	76,659	76,659
Other comprehensive income (loss)	(2,720)		(2,720)
Net loss	(72,019)			(72,019)
Ending balance (in shares) at Jul. 31, 2025					332,134,512
Ending balance at Jul. 31, 2025	$ 1,507,786	$ 3,414,117	$ 1,333	$ (1,907,697)	$ 33