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Long-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Jul. 13, 2018
Sep. 25, 2019
Sep. 26, 2018
Sep. 25, 2019
Sep. 26, 2018
Dec. 26, 2018
Debt Instrument [Line Items]            
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion   $ (29,000)   $ (29,000)    
Revolver loan   101,000,000   101,000,000   $ 74,000,000
Proceeds from (Repayments of) Lines of Credit   16,000,000   27,000,000 $ (23,000,000)  
Repayments of Lines of Credit     $ (10,000,000) 15,000,000 $ 29,000,000  
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months   0        
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax   $ 171,000   $ 171,000    
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen            
Debt Instrument [Line Items]            
Senior secured revolving facility $ 150,000,000          
Senior secured revolving facility term 5 years          
Revolving credit facility maturity period       Jul. 13, 2023    
Debt instrument basis percentage   1.00%        
Letters of credit outstanding   $ 8,500,000   $ 8,500,000    
Revolver loan   101,000,000   101,000,000    
Amount of borrowings available   $ 40,500,000   40,500,000    
Principal payments prior to maturity       $ 0    
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | Minimum            
Debt Instrument [Line Items]            
Debt instrument, interest rate   3.65% 3.57% 3.65% 3.30%  
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | Maximum            
Debt Instrument [Line Items]            
Debt instrument, interest rate   3.90% 3.84% 6.00% 3.84%  
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | Federal Funds Rate            
Debt Instrument [Line Items]            
Debt instrument basis percentage   0.50%        
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | LIBOR | Minimum            
Debt Instrument [Line Items]            
Debt instrument basis percentage   1.25%        
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | LIBOR | Maximum            
Debt Instrument [Line Items]            
Debt instrument basis percentage   2.25%        
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | Base Rate | Minimum            
Debt Instrument [Line Items]            
Debt instrument basis percentage   0.25%        
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | Base Rate | Maximum            
Debt Instrument [Line Items]            
Debt instrument basis percentage   1.25%        
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | Letter of Credit            
Debt Instrument [Line Items]            
Sub limit of revolving facility $ 15,000,000          
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Eighteen | Swing Line Loans            
Debt Instrument [Line Items]            
Sub limit of revolving facility $ 15,000,000          
Senior Secured Revolving Credit Facility | Credit Agreement Two Thousand Fourteen [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Periodic Payment On New Borrowings         $ 6,000,000  
Fair Value, Measurements, Nonrecurring [Member]            
Debt Instrument [Line Items]            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax   $ 171,000        
Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Derivative Asset, Notional Amount   40,000,000   $ 40,000,000    
Interest Expense, Debt   122,000 $ 0 122,000 0  
Interest Income, Other   (29,000) 0 (29,000) 0  
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion   $ (29,000) 0 $ (29,000) 0  
Derivative, Swaption Interest Rate   2.81%   2.81%    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax   $ 171,000 0   0  
Interest Income (Expense), Net   $ 93,000 $ 0 $ 93,000 $ 0