Annual report pursuant to Section 13 and 15(d)

Line Of Credit (Details)

v3.8.0.1
Line Of Credit (Details)
$ in Thousands
12 Months Ended
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 19, 2016
USD ($)
Feb. 18, 2016
USD ($)
Line of Credit Facility [Line Items]        
Credit facility $ 75,000      
Adjusted EBITDA covenant       $ 60,000
Ratio of consolidated funded debt to adjusted EBITDA 2.0      
Line of Credit [Member]        
Line of Credit Facility [Line Items]        
Reduction in available borrowing limit $ 4,723 $ 5,241    
Outstanding debt $ 0 $ 0    
Maturity date Apr. 01, 2021      
Amended And Restated Credit Agreement [Member]        
Line of Credit Facility [Line Items]        
Adjusted EBITDA covenant     $ 100,000