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Accumulated Other Comprehensive Income (Loss) and Shareholders' Equity (Narrative) (Details)
 12 Months Ended
Dec. 29, 2018
USD ($)
hour
shares
Dec. 30, 2017
USD ($)
Mar. 31, 2016
USD ($)
May 31, 2007
shares
Jan. 01, 2007
shares
Schedule of Shareholders' Equity [Line Items]          
Accumulated other comprehensive income (loss) $ (3,599,000) $ (3,611,000)      
Term of employment agreement 2 years        
Certain officers          
Schedule of Shareholders' Equity [Line Items]          
Change in control percentage 20.00%        
Percent of board members 0.3333        
Term of employment agreement 2 years        
Number of times annual salary 200.00%        
Corporation's Chairman, President and CEO          
Schedule of Shareholders' Equity [Line Items]          
Number of times annual salary 300.00%        
Director plan          
Schedule of Shareholders' Equity [Line Items]          
Available for future issuance (shares) | shares       300,000  
Purchase Plan          
Schedule of Shareholders' Equity [Line Items]          
Available for future issuance (shares) | shares         800,000
Rights to purchase stock, minimum working hours per week | hour 20        
Rights to purchase stock, minimum working months per year 5 months        
Price of repurchased stock as percent of closing price on the exercise date 85.00%        
Maximum amount fair value for purchase of common stock $ 25,000        
Shares available for future issuance (shares) | shares 673,013        
Interest rate swap          
Schedule of Shareholders' Equity [Line Items]          
Derivative notional amount     $ 150,000,000    
Fixed interest rate     1.29%    
Derivative asset $ 3,800,000        
Accumulated other comprehensive income (loss) 2,500,000        
Common Stock          
Schedule of Shareholders' Equity [Line Items]          
Remaining authorized repurchase amount $ 48,600,000