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)					4,623,806
Issuance of common stock upon exercise of stock options	11,282	11,282
Vesting of restricted stock units (in shares)					705,572
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
Cancellation of holdback shares (in shares)					(9,551)
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	186,332	186,331			$ 1
Stock-based compensation	120,986	120,986
Other comprehensive loss	(10,903)		(10,903)
Net loss	(284,998)			(284,998)
Shares, end of period (in shares) at Oct. 31, 2022					282,209,207
Balance, end of period at Oct. 31, 2022	1,682,187	2,599,279	(10,449)	(906,671)	$ 28
Shares, beginning of period (in shares) at Jul. 31, 2022					280,576,387
Balance, beginning of period at Jul. 31, 2022	1,739,816	2,549,614	(2,013)	(807,813)	$ 28
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					1,254,653
Issuance of common stock upon exercise of stock options	2,900	2,900
Vesting of restricted stock units (in shares)					387,718
Cancellation of holdback shares (in shares)					(9,551)
Stock-based compensation	46,765	46,765
Other comprehensive loss	(8,436)		(8,436)
Net loss	(98,858)			(98,858)
Shares, end of period (in shares) at Oct. 31, 2022					282,209,207
Balance, end of period at Oct. 31, 2022	1,682,187	2,599,279	(10,449)	(906,671)	$ 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)					6,484,688
Issuance of common stock upon exercise of stock options	17,366	17,365			$ 1
Vesting of restricted 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 stock purchase plan	6,416	6,416
Vesting of early exercised stock options	178	178
Stock-based compensation	167,852	167,852
Other comprehensive loss	(977)		(977)
Net loss	(266,711)			(266,711)
Shares, end of period (in shares) at Oct. 31, 2023					297,907,453
Balance, end of period at Oct. 31, 2023	1,580,829	2,855,205	(7,344)	(1,267,062)	$ 30
Shares, beginning of period (in shares) at Jul. 31, 2023					294,898,606
Balance, beginning of period 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 (in shares)					1,598,846
Vesting of early exercised stock options	9	9
Stock-based compensation	56,657	56,657
Other comprehensive loss	1,627		1,627
Net loss	(70,304)			(70,304)
Shares, end of period (in shares) at Oct. 31, 2023					297,907,453
Balance, end of period at Oct. 31, 2023	$ 1,580,829	$ 2,855,205	$ (7,344)	$ (1,267,062)	$ 30