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Summary of Significant Accounting Policies (Additional Information) (Detail) - USD ($)
3 Months Ended
Apr. 01, 2016
Apr. 03, 2015
Jan. 01, 2016
Significant Accounting Policies [Line Items]      
Increase (decrease) in income due to contract estimates $ 8,000,000 $ 4,000,000  
Increase (decrease) in income due to contract estimates per diluted share $ 0.07 $ 0.04  
Leidos, Inc.      
Significant Accounting Policies [Line Items]      
Ownership interest (in percentage) 100.00%    
Notes payable and long-term debt, net of current portion | Notes Which Mature In December 2020 | Designated as Hedging Instrument | Interest rate swaps      
Significant Accounting Policies [Line Items]      
Hedged instrument, face amount $ 450,000,000    
Stated interest rate (in percentage) 4.45%    
Fair value      
Significant Accounting Policies [Line Items]      
Fair value of long term debt $ 1,070,000,000    
Carrying value      
Significant Accounting Policies [Line Items]      
Fair value of note receivable 95,000,000    
Fair value of long term debt $ 1,090,000,000    
New Accounting Pronouncement, Early Adoption, Effect | Notes payable and long-term debt, net of current portion      
Significant Accounting Policies [Line Items]      
Debt issuance costs     $ 7,000,000