Sales of Receivables (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Oct. 31, 2025	Nov. 01, 2024	Oct. 31, 2025	Nov. 01, 2024
Receivables [Abstract]
Maximum commitment	$ 300		$ 300
Purchase discount fees	$ 3	$ 4	$ 10	$ 11

TransfersOfFinancialAssetsAccountedForAsSalesMarpaMaximumCommitment

No definition available.

Name:	saic_TransfersOfFinancialAssetsAccountedForAsSalesMarpaMaximumCommitment
Namespace Prefix:	saic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant