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Income Taxes - Income Taxes Paid (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2024
Effective Income Tax Rate Reconciliation [Line Items]
Federal taxes	$ 17
Total state taxes	53
Total U.S. taxes	70
Foreign taxes	26
Cash paid for income taxes, net of refunds	96	$ 65	$ 39
CALIFORNIA
Effective Income Tax Rate Reconciliation [Line Items]
Total state taxes	7
NEW YORK
Effective Income Tax Rate Reconciliation [Line Items]
Total state taxes	8
Other states
Effective Income Tax Rate Reconciliation [Line Items]
Total state taxes	$ 38