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Description of Business and Summary of Significant Accounting Policies - Additional Information (Details)
9 Months Ended
Sep. 26, 2014
USD ($)
Sep. 25, 2015
USD ($)
segment
Sep. 26, 2014
USD ($)
Sep. 18, 2014
Sep. 17, 2014
USD ($)
Accounting Policies [Line Items]          
Number of reportable segments | segment   1      
Transition services agreement, term (or less)   1 year      
Distribution to subsidiary of Exelis $ 136,300,000 $ 0 $ 136,281,000    
Vectrus, Inc.          
Accounting Policies [Line Items]          
Common stock, distribution basis for issued and outstanding shares       0.0556  
Term Loan | Term Facility          
Accounting Policies [Line Items]          
Credit facility, maximum borrowing capacity         $ 140,000,000
Distribution to subsidiary of Exelis $ 136,300,000