Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Narrative) (Details)

v3.8.0.1
Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Commitments And Contingencies [Line Items]      
Total rent expense $ 10,931 $ 10,153 $ 10,503
Unconditional purchase obligations due in one year $ 10,725    
Minimum employee age to partake in 401(k) 18 years    
Requisite service period to partake in 401(k) 1 month    
Employers' percentage match of employee's contribution percentage 100.00%    
Percentage of employee's gross pay that is matched by the employer 1.00%    
Employers' percentage match of employee's contribution percentage over one percent 50.00%    
Employers' maximum contribution of employee's compensation 6.00%    
Requisite service in order to cliff vest 2 years    
Contributions made by the Company $ 1,794 $ 1,594 $ 1,458
Buildings [Member]      
Commitments And Contingencies [Line Items]      
Lease expiration date 2026    
Equipment [Member]      
Commitments And Contingencies [Line Items]      
Lease expiration date 2021