Related Party Transactions (Additional Information) (Detail) - USD ($)	6 Months Ended
	Jul. 03, 2015	Jan. 30, 2015
Related Party Transaction [Line Items]
Credit facility, maturity date	2017
Leidos Holdings Inc,
Related Party Transaction [Line Items]
Notes receivable	$ 1,600,000,000
Notes Which Mature In December 2020
Related Party Transaction [Line Items]
Notes payable	$ 450,000,000
Stated interest rate	4.45%
Notes Which Mature In December 2040
Related Party Transaction [Line Items]
Notes payable	$ 300,000,000
Stated interest rate	5.95%	5.95%
Notes Which Mature In July 2033
Related Party Transaction [Line Items]
Notes payable	$ 300,000,000
Stated interest rate	5.50%	5.50%
Notes Which Mature In July 2032
Related Party Transaction [Line Items]
Notes payable	$ 250,000,000
Stated interest rate	7.13%