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Line Of Credit (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 01, 2016
Dec. 31, 2016
USD ($)
Jan. 02, 2016
USD ($)
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   5,241 $ 4,153    
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