Discontinued Operations - Additional Information (Detail) (USD $)	4 Months Ended	8 Months Ended	12 Months Ended				0 Months Ended
	Jan. 31, 2014	Sep. 27, 2013	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012	Jun. 30, 2013	Sep. 26, 2013 SAIC Leidos, Inc.
Discontinued Operations [Line Items]
Unsecured borrowing capacity						$ 500,000,000
Borrowings outstanding under the revolving credit facility	0	500,000,000	0	0
Reverse stock split	0.25
Proceeds from divestiture of businesses		295,000,000	295,000,000	0	0
Reimbursement to Leidos, Inc.							5,000,000
Capital contribution to new SAIC							26,000,000
Proceeds from discontinued operations				51,000,000	167,000,000
Gain on sale before Income Tax				$ 17,000,000	$ 111,000,000