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)

v3.20.1
Supplemental Retirement Plan and Related Post Retirement Benefits - Summary of the Components of Net Periodic Cost (Details)
$ in Thousands
 3 Months Ended
Mar. 28, 2020
USD ($)
retirement_plan
Mar. 30, 2019
USD ($)
Retirement Benefits [Abstract]    
Number of non-qualified supplemental retirement defined benefit plans | retirement_plan 2  
SERP    
Defined Benefit Plan Disclosure    
Service Cost $ 55 $ 45
Interest Cost 209 229
Amortization of Prior Service Cost 97 97
Amortization of Net Actuarial Losses 162 75
Net Periodic Cost 523 446
SERP | SERP Medical    
Defined Benefit Plan Disclosure    
Service Cost 4 3
Interest Cost 9 12
Amortization of Prior Service Cost 4 4
Amortization of Net Actuarial Losses 9 10
Net Periodic Cost $ 26 $ 29