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Commitments (Letters of Credit and Restricted Cash Narrative) (Details)
 12 Months Ended
Dec. 28, 2018
USD ($)
debt_instrument
Dec. 29, 2017
USD ($)
Operating Leased Assets [Line Items]    
Collateral provided for purchasing card program $ 3,000,000  
Workers Compensation Insurance Policy    
Operating Leased Assets [Line Items]    
Line of credit borrowing capacity 100,000 $ 600,000
Building lease    
Operating Leased Assets [Line Items]    
Line of credit borrowing capacity $ 500,000  
Standby letters of credit    
Operating Leased Assets [Line Items]    
Number of letters of credit entered into (in debt instruments) | debt_instrument 2  
Line of credit borrowing capacity $ 1,000,000 $ 1,000,000.0
Letters of credit outstanding $ 0