Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Other Comprehensive 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, 2022					270,451,615
Balance, beginning of period at Jan. 31, 2022	$ 1,650,788	$ 2,271,980	$ 454	$ (621,673)	$ 27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					3,369,153
Issuance of common stock upon exercise of stock options	8,381	8,381
Vesting of restricted stock units (in shares)					317,854
Issuance of common stock under employee stock purchase plan (in shares)					405,534
Issuance of common stock under employee stock purchase plan	8,682	8,682
Vesting of early exercised stock options	18	18
Issuance of common stock in connection with acquisition (in shares)					6,032,231
Issuance of common stock in connection with acquisition	186,333	186,332			$ 1
Stock-based compensation	74,221	74,221
Other comprehensive loss	(2,467)		(2,467)
Net loss	(186,140)			(186,140)
Shares, end of period (in shares) at Jul. 31, 2022					280,576,387
Balance, end of period at Jul. 31, 2022	1,739,816	2,549,614	(2,013)	(807,813)	$ 28
Shares, beginning of period (in shares) at Apr. 30, 2022					272,496,624
Balance, beginning of period at Apr. 30, 2022	1,597,242	2,309,505	(783)	(711,507)	$ 27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					1,350,556
Issuance of common stock upon exercise of stock options	3,291	3,291
Vesting of restricted stock units (in shares)					291,442
Issuance of common stock under employee stock purchase plan (in shares)					405,534
Issuance of common stock under employee stock purchase plan	8,682	8,682
Issuance of common stock in connection with acquisition (in shares)					6,032,231
Issuance of common stock in connection with acquisition	186,333	186,332			$ 1
Stock-based compensation	41,804	41,804
Other comprehensive loss	(1,230)		(1,230)
Net loss	(96,306)			(96,306)
Shares, end of period (in shares) at Jul. 31, 2022					280,576,387
Balance, end of period at Jul. 31, 2022	1,739,816	2,549,614	(2,013)	(807,813)	$ 28
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 stock purchase plan	6,416	6,416
Vesting of early exercised stock options	169	169
Stock-based compensation	111,195	111,195
Other comprehensive loss	(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 stock purchase plan	6,416	6,416
Vesting of early exercised stock options	120	120
Stock-based compensation	54,422	54,422
Other comprehensive loss	(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