Schedule of Segment Reporting Information by Segment (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 30, 2015	Jul. 03, 2015	Aug. 01, 2014	Jul. 03, 2015	Aug. 01, 2014
Segment Reporting Information [Line Items]
Revenues	$ 373	$ 1,257	$ 1,306	$ 2,503	$ 2,618
Operating income (loss)	$ (23)	64	(410)	102	(323)
Segments | National Security Solutions
Segment Reporting Information [Line Items]
Revenues		879	925	1,741	1,869
Operating income (loss)		74	78	136	155
Segments | Health and Engineering
Segment Reporting Information [Line Items]
Revenues		379	381	764	753
Operating income (loss)		(7)	(482)	(14)	(459)
Segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenues		(1)	0	(2)	(4)
Operating income (loss)		$ (3)	$ (6)	$ (20)	$ (19)