Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023
Operating Loss Carryforwards [Line Items]
Provision for (benefit from) income taxes	$ 38,243	$ (819,944)	$ 19,699
Valuation allowance, deferred tax asset, amount released	23,500	837,300
Tax benefit from compensation expense	132,800	143,000	7,100
Increase (decrease) in tax benefit	26,300	16,000	(3,800)
Unrecognized tax benefits	102,388	$ 75,546	$ 60,744	$ 47,946
Unrecognized tax benefits that would affect tax rate, if recognized	83,500
Accrued interest and penalties	3,700
Domestic Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,800,000
Research tax credit carryforwards	245,200
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,300,000
Research tax credit carryforwards	79,000
California
Operating Loss Carryforwards [Line Items]
Research tax credit carryforwards	77,000
Foreign Tax Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 53,800