Related Party Transactions (Additional Information) (Detail) (USD $)	3 Months Ended
	Apr. 03, 2015
Related Party Transaction [Line Items]
Credit facility, maturity date	2017
Leidos Holdings Inc,
Related Party Transaction [Line Items]
Notes receivable	1,400,000,000
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%
Notes Which Mature In July 2033
Related Party Transaction [Line Items]
Notes payable	300,000,000
Stated interest rate	5.50%
Notes Which Mature In July 2032
Related Party Transaction [Line Items]
Notes payable	250,000,000
Stated interest rate	7.13%