Quarterly report pursuant to Section 13 or 15(d)

Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Details)

v3.20.2
Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2020
USD ($)
Sep. 28, 2019
USD ($)
Sep. 26, 2020
USD ($)
retirement_plan
Sep. 28, 2019
USD ($)
Retirement Benefits [Abstract]        
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan     2  
SERP        
Defined Benefit Plan Disclosure        
Service Cost $ 56 $ 45 $ 167 $ 136
Interest Cost 209 229 627 687
Amortization of Prior Service Cost 97 97 290 290
Amortization of Net Actuarial Losses 162 74 486 224
Net Periodic Cost 524 445 1,570 1,337
SERP | SERP Medical        
Defined Benefit Plan Disclosure        
Service Cost 4 3 11 10
Interest Cost 9 12 26 35
Amortization of Prior Service Cost 4 4 12 12
Amortization of Net Actuarial Losses 9 11 29 32
Net Periodic Cost $ 26 $ 30 $ 78 $ 89