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Income Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Details) - USD ($) $ in Thousands	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Operating Loss Carryforwards [Line Items]
Provision for income taxes	$ 22,402	$ 72,355	$ 4,760
Valuation allowance increase (decrease), amount	139,200	357,000	206,200
Deferred tax assets, valuation allowance	910,070	770,861	413,800
Research and other credit carryforwards	75,712	56,539
Unrecognized tax benefits	36,901	26,324	$ 24,447	$ 5,469
Unrecognized tax benefits that would impact effective tax rate	4,200
Domestic Tax Authority \| Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,600,000
Research and other credit carryforwards	87,400
State and Local Jurisdiction \| California
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	248,200
Research and other credit carryforwards	18,800
State and Local Jurisdiction \| Other States
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	1,000,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Provision for income taxes	4,700	$ 57,200
Foreign Tax Authority \| United Kingdom
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 80,900