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, 2023					286,763,857
Beginning balance at Jan. 31, 2023	$ 1,656,705	$ 2,663,394	$ (6,367)	$ (1,000,351)	$ 29
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					6,484,688
Issuance of common stock upon exercise of stock options	17,366	17,365			$ 1
Vesting of restricted stock units and performance stock units (in shares)					4,090,297
Issuance of common stock under employee stock purchase plan (in shares)					568,611
Issuance of common stock under employee purchase plan	6,416	6,416
Vesting of early exercised stock options	178	178
Stock-based compensation	167,852	167,852
Other comprehensive income (loss)	(977)		(977)
Net loss	(266,711)			(266,711)
Ending balance (in shares) at Oct. 31, 2023					297,907,453
Ending balance at Oct. 31, 2023	1,580,829	2,855,205	(7,344)	(1,267,062)	$ 30
Beginning balance (in shares) at Jul. 31, 2023					294,898,606
Beginning balance at Jul. 31, 2023	1,589,319	2,795,019	(8,971)	(1,196,758)	$ 29
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					1,410,001
Issuance of common stock upon exercise of stock options	3,521	3,520			$ 1
Vesting of restricted stock units and performance stock units (in shares)					1,598,846
Vesting of early exercised stock options	9	9
Stock-based compensation	56,657	56,657
Other comprehensive income (loss)	1,627		1,627
Net loss	(70,304)			(70,304)
Ending balance (in shares) at Oct. 31, 2023					297,907,453
Ending balance at Oct. 31, 2023	1,580,829	2,855,205	(7,344)	(1,267,062)	$ 30
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
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)					6,906,765
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	$ 203,569	203,569
Other comprehensive income (loss)	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 income (loss)	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