Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	11 Months Ended		12 Months Ended
	Aug. 01, 2014	Jan. 01, 2016	Jan. 02, 2015	Jan. 30, 2015	Jan. 31, 2014
Income Taxes [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		35.00%		35.00%	35.00%
Goodwill impairment charges	$ 486	$ 0	$ 486	$ 486	$ 0
Decrease in unrecognized tax benefits due to resolutions with tax authorities					(7)
Tax benefit from dividend paid to New SAIC's employees					7
Tax benefit from special dividend paid by the company					11
Tax benefit due to conversion of subsidiary to LLC from Partnership				18
Reversal of accruals for unrecognized tax benefits		4		11	2
Unrecognized tax benefits accrued interest and penalties		1		2	2
Liabilities for uncertain tax positions		12		19	16
Liabilities for uncertain tax positions, long-term		5		$ 6	$ 12
Amount of reasonably possible resolution of reviews		7
Capital Loss Carryforward [Member]
Income Taxes [Line Items]
State tax credit carryforwards		232
State
Income Taxes [Line Items]
State tax credit carryforwards		12
State tax credits		7
Expiration in Calender Year 2018 [Member] | State
Income Taxes [Line Items]
Net operating loss carryforwards		2
Expiration in Calender Year 2016 [Member] | State
Income Taxes [Line Items]
Net operating loss carryforwards		$ 9