Debt - Additional Information (Details)
6 Months Ended 12 Months Ended
Sep. 26, 2014
USD ($)
Sep. 17, 2014
USD ($)
Jun. 26, 2015
USD ($)
letters_of_credit
Jul. 01, 2016
USD ($)
Dec. 31, 2015
Apr. 01, 2016
Sep. 25, 2015
Debt Instrument [Line Items]              
Distribution to subsidiary of Exelis $ 136,300,000            
Maximum allowed dividend distribution     $ 5,000,000        
Senior Secured Credit Facilities              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity   $ 215,000,000          
Covenant terms, ratio of total indebtedness to consolidated EBITDA     3.50        
Covenant terms, ratio of consolidated EBITDA to combined interest expense     4.50        
Ratio of total indebtedness to consolidated EBITDA     2.55        
Ratio of combined EBITDA to consolidated interest expense     7.84        
Interest rate     3.19%        
Debt instrument, percentage of interest in event of default in excess of applicable rate     2.00%        
Senior Secured Credit Facilities | Minimum              
Debt Instrument [Line Items]              
Undrawn portion of revolving facility, commitment fee percentage     0.40%        
Senior Secured Credit Facilities | Maximum              
Debt Instrument [Line Items]              
Undrawn portion of revolving facility, commitment fee percentage     0.50%        
Senior Secured Credit Facilities | London Interbank Offered Rate (LIBOR) | Minimum              
Debt Instrument [Line Items]              
Spread on variable rate     2.50%        
Senior Secured Credit Facilities | London Interbank Offered Rate (LIBOR) | Maximum              
Debt Instrument [Line Items]              
Spread on variable rate     3.00%        
Term Loan              
Debt Instrument [Line Items]              
Face amount of term loan facility   $ 140,000,000          
Facility, maturity   5 years          
Term facility, balance outstanding     $ 126,100,000        
Term facility, amortization rate, year one   7.50%          
Term Facility, amortization rate, year two   10.00%          
Term facility, amortization rate, year three   10.00%          
Term facility, amortization rate, year four   15.00%          
Term facility, amortization rate, year five   57.50%          
Estimated repayment of debt     $ 6,000,000        
Term facility, mandatory prepayment terms, percentage of net cash proceeds from incurrence of indebtedness     100.00%        
Term facility, mandatory prepayment terms, percentage of net cash proceeds of all non-ordinary course asset sales or other dispositions of property     100.00%        
Revolver              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity   $ 75,000,000          
Facility, maturity   5 years          
Available borrowing capacity     $ 58,100,000        
Letters of Credit              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity   $ 35,000,000          
Number of letters of credit outstanding | letters_of_credit     8        
Letters of credit outstanding     $ 16,900,000        
Swingline Facility              
Debt Instrument [Line Items]              
Credit facility, maximum borrowing capacity   10,000,000          
Scenario, Forecast | Senior Secured Credit Facilities              
Debt Instrument [Line Items]              
Covenant terms, ratio of total indebtedness to consolidated EBITDA           2.75 3.00
Scenario, Forecast | Term Loan              
Debt Instrument [Line Items]              
Estimated repayment of debt       $ 6,000,000      
Term facility, mandatory prepayment terms, percentage of borrower's excess cash flow         50.00%    
Term facility, mandatory prepayment terms, percentage of borrower's excess cash flow, stepdown to 25%         25.00%    
Term facility, mandatory prepayment terms, percentage of borrower's excess cash flow, stepdown to 0%         0.00%    
Long-term debt, net              
Debt Instrument [Line Items]              
Debt financing fees   $ 3,700,000