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Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
Income Taxes - Narrative (Details) - USD ($)	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Income Tax Contingency [Line Items]
Valuation allowance increase (decrease)	$ 52,900,000	$ 68,900,000	$ 61,900,000
Unrecognized tax benefits, accrued interest and penalties	0	$ 0
Domestic Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards	1,588,000,000
Tax credit carryforwards	133,400,000
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Operating loss carryforwards	819,000,000.0
Tax credit carryforwards	$ 82,800,000