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
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 options (in shares)					10,298,114
Issuance of common stock upon exercise of options	28,318	28,317			$ 1
Vesting of restricted stock units and performance stock units (in shares)					6,021,877
Vesting of restricted stock units and performance stock units	0
Issuance of common stock under employee stock purchase plan (in shares)					1,607,874
Issuance of common stock under employee stock purchase plan	19,147	19,147			$ 0
Vesting of early exercised options	186	186
Stock-based compensation	223,563	223,563
Other comprehensive (loss) income	4,817		4,817
Net loss	(338,693)			(338,693)
Ending balance (in shares) at Jan. 31, 2024					304,691,722
Ending 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 options (in shares)					7,881,544
Issuance of common stock upon exercise of options	33,406	33,405			$ 1
Vesting of restricted stock units and performance stock units (in shares)					9,370,381
Vesting of restricted stock units and performance stock units	0
Issuance of common stock under employee stock purchase plan (in shares)					1,300,151
Issuance of common stock under employee stock purchase plan	22,500	22,500
Issuance of common stock and assumed options in connection with acquisitions (in shares)					2,354,607
Issuance of common stock and assumed options in connection with acquisitions	$ 23,739	23,738			$ 1
Repurchase of common stock (in shares)	(19,300)
Repurchase of common stock	$ 0
Stock-based compensation	280,292	280,292
Other comprehensive (loss) income	3,708		3,708
Net loss	(288,441)			(288,441)
Ending balance (in shares) at Jan. 31, 2025					325,579,105
Ending 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 options (in shares)					4,085,234
Issuance of common stock upon exercise of options	18,049	18,049
Vesting of restricted stock units and performance stock units (in shares)					11,956,991
Vesting of restricted stock units and performance stock units	1				$ 1
Issuance of common stock under employee stock purchase plan (in shares)					1,542,617
Issuance of common stock under employee stock purchase plan	21,210	21,210
Issuance of common stock and assumed options in connection with acquisitions (in shares)					6,818,255
Issuance of common stock and assumed options in connection with acquisitions	$ 71,641	71,640			$ 1
Repurchase of common stock (in shares)	(12,205,252)
Repurchase of common stock	$ (200,012)	(200,012)
Stock-based compensation	307,588	307,588
Other comprehensive (loss) income	156		156
Net loss	(450,735)			(450,735)
Ending balance (in shares) at Jan. 31, 2026					337,776,950
Ending balance at Jan. 31, 2026	$ 1,437,145	$ 3,513,017	$ 2,314	$ (2,078,220)	$ 34