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Pensions and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 28, 2020
Retirement Benefits [Abstract]  
Schedule of Net Pension and Other Retirement Plan Costs
The following table sets forth the components of the net periodic benefit cost for the Company's defined benefit pension and OPEB plans (in thousands):
 
Fiscal quarter ended 
 March 28, 2020
 
Fiscal quarter ended 
 March 30, 2019
 
Pension
Plans
 
OPEB
Plans
 
Pension
Plans
 
OPEB
Plans
Net service cost
$
99

 
$
31

 
$
83

 
$
31

Interest cost
129

 
33

 
157

 
45

Expected return on plan assets
(111
)
 

 
(133
)
 

Amortization of actuarial losses
77

 
34

 
50

 
39

Net periodic benefit cost
$
194

 
$
98

 
$
157

 
$
115