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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2022
Operating Loss Carryforwards [Line Items]
Provision for income taxes	$ 71,130	$ 32,232	$ 22,402
Valuation allowance increase (decrease), amount	234,700	47,600	139,200
Deferred tax assets, valuation allowance	1,192,366	957,710	910,100
Research and other credit carryforwards	144,068	100,002
Unrecognized tax benefits	117,540	58,875	$ 36,901	$ 26,324
Unrecognized tax benefits that would impact effective tax rate	54,800
Interest and penalties	3,000	$ 1,400
Foreign Tax Jurisdiction \| United Kingdom
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	78,000
Domestic Tax Jurisdiction \| Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,400,000
Research and other credit carryforwards	165,100
State and Local Jurisdiction \| California
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	307,900
Research and other credit carryforwards	39,600
State and Local Jurisdiction \| Other States
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 716,000