Goodwill and Intangible Assets (Additional Information) (Detail) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Oct. 02, 2015	Oct. 31, 2014	Aug. 01, 2014	Oct. 02, 2015	Oct. 31, 2014	Jan. 30, 2015
Goodwill [Line Items]
Goodwill impairment charges		$ 0		$ 0	$ 486,000,000	$ 486,000,000
Amortization expense related to amortizable intangible assets	$ 2,000,000	3,000,000		7,000,000	13,000,000
Intangible impairment	4,000,000	17,000,000		73,000,000	41,000,000
Gross carrying value	81,000,000			$ 81,000,000		122,000,000
Health Solutions [Member]
Goodwill [Line Items]
Goodwill impairment charges		369,000,000
NSS
Goodwill [Line Items]
Goodwill impairment charges						0
HES
Goodwill [Line Items]
Goodwill impairment charges						486,000,000
Impairment of Intangible Assets, Finite-lived		17,000,000			$ 41,000,000
Engineering [Member]
Goodwill [Line Items]
Goodwill impairment charges		117,000,000
Software and Technology
Goodwill [Line Items]
Useful life of intangible				9 years
Gross carrying value	61,000,000			$ 61,000,000		52,000,000
Customer Relationships
Goodwill [Line Items]
Amortization expense related to amortizable intangible assets	12,000,000
Gross carrying value	20,000,000			20,000,000		$ 70,000,000
Customer Relationships | HES
Goodwill [Line Items]
Impairment of Intangible Assets, Finite-lived	4,000,000		$ 24,000,000
Gross carrying value	$ 38,000,000			$ 38,000,000
Reveal Imaging Technologies, Inc. [Member] | Software and Technology
Goodwill [Line Items]
Impairment of Intangible Assets, Finite-lived		14,000,000
Plainfield
Goodwill [Line Items]
Impairment of Intangible Assets, Finite-lived		$ 3,000,000