Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Income Tax Disclosure [Abstract]
Income tax benefit computed at federal statutory rate	$ (269,871)	$ (178,337)	$ (171,359)
State taxes, net of federal benefit	33,910	26,380	14,948
Research and development credits	(133,266)	(101,725)	(58,136)
Stock-based compensation	(7,667)	(148,600)	(71,295)
Change in valuation allowance	363,422	371,767	213,532
IRC Section 59A waived deductions	0	11,550	49,476
Other	17,585	7,732	4,367
Provision for (benefit from) income taxes	$ 4,113	$ (11,233)	$ (18,467)