Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Jan. 29, 2021	Mar. 05, 2021	Jul. 31, 2020
Document And Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jan. 29, 2021
Document Transition Report	false
Entity File Number	001-35832
Entity Registrant Name	Science ApplicationsInternational Corporation
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-1932921
Entity Address, Address Description	12010 Sunset Hills Road
Entity Address, City or Town	Reston
Entity Address, State or Province	VA
Entity Address, Postal Zip Code	20190
City Area Code	703
Local Phone Number	676-4300
Title of 12(b) Security	Science Applications International CorporationCommon Stock, Par Value $.0001 Per Share
Trading Symbol	SAIC
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 4.5
Entity Common Stock, Shares Outstanding (in shares)		58,066,285
Documents Incorporated by Reference [Text Block]	Portions of Science Applications International Corporation’s Definitive Proxy Statement for the 2021 Annual Meeting of Stockholders are incorporated by reference in Part III of this report.
Entity Central Index Key	0001571123
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--01-29
ICFR Auditor Attestation Flag	true