Schedule of Segment Reporting Information by Segment (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Jan. 30, 2015	Apr. 03, 2015	May 02, 2014
Segment Reporting Information [Line Items]
Revenues	$ 373	$ 1,246	$ 1,312
Operating income (loss)		38	87
Segments | National Security Solutions
Segment Reporting Information [Line Items]
Revenues		862	944
Operating income (loss)		62	77
Segments | Health and Engineering
Segment Reporting Information [Line Items]
Revenues		385	372
Operating income (loss)		(7)	23
Segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenues		(1)	(4)
Operating income (loss)		$ (17)	$ (13)