Quarterly report pursuant to Section 13 or 15(d)

Line Of Credit (Narrative) (Details)

v3.10.0.1
Line Of Credit (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 29, 2018
Dec. 30, 2017
Feb. 19, 2016
Line of Credit Facility [Line Items]      
Credit facility $ 75,000    
Line of Credit [Member]      
Line of Credit Facility [Line Items]      
Reduction in available borrowing limit 6,602 $ 4,273  
Outstanding debt $ 0 $ 0  
Maturity date Apr. 27, 2021    
Amended And Restated Credit Agreement [Member]      
Line of Credit Facility [Line Items]      
Adjusted EBITDA covenant     $ 100,000