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Postretirement Benefits Schedule of Net Funded Status and APBO (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Defined Benefit Plan [Abstract]      
Benefit obligation at beginning of year $ 4,320   $ 4,838
Service cost 145 $ 196 192
Interest cost 150 178 191
Plan participants' contributions 95 97  
Plan participants' contributions 95 97  
Actuarial loss (gain) (1,972) (894)  
Benefits paid (198) (99)  
Benefits paid (198) (99)  
Medicare part D prescription drug subsidy 15 4  
Benefit obligation at end of year 2,555 4,320  
Fair value of plan assets at beginning of year 0   $ 0
Employer contributions 88 (2)  
Funded status (2,555) (4,320)  
Fair value of plan assets at end of year $ 0 $ 0  
Discount rate used to determine benefit obligations 2.62% 4.17%  
Discount rate used to determine net periodic benefit cost 4.17% 3.60%  
Defined Benefit Plan, Plan Assets, Prescription Drug Subsidy Receipt $ 15 $ 4