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Retirement Plans (Tables)
 3 Months Ended
Apr. 04, 2021
Retirement Benefits [Abstract]  
Net Periodic Defined-Benefit Pension And Other Post-Retirement Benefit Cost net periodic benefit credit for the three-month periods ended April 4, 2021, and March 29, 2020, consisted of the following:
Pension BenefitsOther Post-retirement Benefits
Three Months EndedApril 4, 2021March 29, 2020April 4, 2021March 29, 2020
Service cost$30 $29 $2 $2 
Interest cost90 123 5 7 
Expected return on plan assets(241)(234)(9)(9)
Net actuarial loss (gain)103 79 — (1)
Prior service credit(5)(4)— — 
Net periodic benefit credit$(23)$(7)$(2)$(1)