Summary of Significant Accounting Policies - Additional Information (Detail) $ / shares in Units, $ in Millions				3 Months Ended	4 Months Ended	11 Months Ended		12 Months Ended
	Oct. 11, 2013	Sep. 28, 2013	Jun. 14, 2013 USD ($)	Aug. 01, 2014 USD ($)	Jan. 31, 2014	Jan. 01, 2016 USD ($) $ / shares	Jan. 02, 2015 USD ($)	Jan. 30, 2015 USD ($) $ / shares	Jan. 31, 2014 USD ($) $ / shares	Sep. 27, 2013
Significant Accounting Policies [Line Items]
Reverse stock split		0.25			0.25
Restructuring charges						$ 1		$ 3	$ 65
Ownership in VIE	100.00%
Percentage of shares of newly formed company after spin-off transaction										100.00%
Increase (decrease) in income due to contract estimates						$ 18		$ 24	$ (21)
Increase (decrease) in income due to contract estimates per diluted share | $ / shares						$ (0.14)		$ (0.20)	$ 0.15
Noncontrolling ownership interest, less than						50.00%
Goodwill impairment charges				$ 486		$ 0	$ 486	$ 486	$ 0
Internal research and development costs included in selling, general and administrative expenses						29		37	$ 45
Special cash dividend | $ / shares									$ 4.00
Payment towards dividends			$ 342
Lease termination and facility consolidation expenses						4		3	$ 46
Net current deferred tax assets						0		(12)
Deferred tax liabilities						34		21
Business Exit Costs						$ 5
Leidos, Inc.
Significant Accounting Policies [Line Items]
Ownership interest (in percentage)						100.00%
Goodwill impairment charges						$ 0	$ 486	$ 486	0
Software and Technology
Significant Accounting Policies [Line Items]
Useful life of intangible assets						9 years
Software and Technology | Minimum
Significant Accounting Policies [Line Items]
Useful life of intangible assets						9 years
Software and Technology | Maximum
Significant Accounting Policies [Line Items]
Useful life of intangible assets						15 years
Customer Relationships | Minimum
Significant Accounting Policies [Line Items]
Useful life of intangible assets						8 years
Customer Relationships | Maximum
Significant Accounting Policies [Line Items]
Useful life of intangible assets						10 years
Spinoff | SAIC
Significant Accounting Policies [Line Items]
Restructuring charges									$ 55
New Accounting Pronouncement, Early Adoption, Effect [Member]
Significant Accounting Policies [Line Items]
Net current deferred tax assets						$ 13
Deferred tax liabilities						12
Deferred tax assets						$ 1