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Net Periodic Pension Cost (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 28, 2019
USD ($)
Sep. 28, 2019
USD ($)
employee
Sep. 29, 2018
USD ($)
Sep. 28, 2019
USD ($)
employee
Sep. 29, 2018
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Service cost   $ 29 $ 133 $ 190 $ 399
Interest cost on projected benefit obligation   881 963 2,899 2,889
Expected return on plan assets   (1,339) (1,327) (3,828) (3,981)
Amortization of unrecognized loss   278 271 857 813
Net periodic pension cost (benefit)   $ (151) $ 40 $ 118 $ 120
Number of participants not accruing future years of service | employee   49   49  
Decrease in pension benefit obligation   $ 100   $ 300  
Decrease to AOCI, plan asset valuation   $ 2,500   $ 2,700  
Forecast          
Defined Benefit Plan Disclosure [Line Items]          
Expected lump sum pension payment $ 9,500