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6. Employee Retirement Benefit Plans (Tables)
3 Months Ended
Mar. 29, 2019
Table Text Block Supplement [Abstract]  
Schedule of Net Periodic Benefit Cost

Components of Net Periodic Benefit Expense

 

  Supplemental Executive
  Retirement Plan
  March 29,   March 30,
For the three months ended: 2019   2018
           
Interest cost $ 37      $ 34   
Amortization of actuarial loss   20        20   
Net periodic benefit expense $ 57      $ 54