Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Class A and Class B Common Stock Class A and Class B Common Stock
Shares, beginning of period (in shares) at Jan. 31, 2023					286,763,857
Balance, beginning of period 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)					5,074,687
Issuance of common stock upon exercise of stock options	13,845	13,845
Vesting of restricted stock units (in shares)					2,491,451
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	169	169
Stock-based compensation	111,195	111,195
Other comprehensive income	(2,604)		(2,604)
Net loss	(196,407)			(196,407)
Shares, end of period (in shares) at Jul. 31, 2023					294,898,606
Balance, end of period at Jul. 31, 2023	1,589,319	2,795,019	(8,971)	(1,196,758)	$ 29
Shares, beginning of period (in shares) at Apr. 30, 2023					291,225,065
Balance, beginning of period at Apr. 30, 2023	1,617,174	2,729,978	(5,613)	(1,107,220)	$ 29
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					1,372,895
Issuance of common stock upon exercise of stock options	4,083	4,083
Vesting of restricted stock units (in shares)					1,732,035
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	120	120
Stock-based compensation	54,422	54,422
Other comprehensive income	(3,358)		(3,358)
Net loss	(89,538)			(89,538)
Shares, end of period (in shares) at Jul. 31, 2023					294,898,606
Balance, end of period at Jul. 31, 2023	1,589,319	2,795,019	(8,971)	(1,196,758)	$ 29
Shares, beginning of period (in shares) at Jan. 31, 2024					304,691,722
Balance, beginning of period 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 (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 (shares)	(19,300)
Stock-based compensation	$ 130,886	130,886
Other comprehensive income	2,695		2,695
Net loss	(139,289)			(139,289)
Shares, end of period (in shares) at Jul. 31, 2024					315,927,204
Balance, end of period at Jul. 31, 2024	1,633,687	3,110,843	1,145	(1,478,333)	$ 32
Shares, beginning of period (in shares) at Apr. 30, 2024					311,556,289
Balance, beginning of period 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
Vesting of restricted 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	3,938		3,938
Net loss	(69,184)			(69,184)
Shares, end of period (in shares) at Jul. 31, 2024					315,927,204
Balance, end of period at Jul. 31, 2024	$ 1,633,687	$ 3,110,843	$ 1,145	$ (1,478,333)	$ 32