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Retirement Plans (Tables)
 9 Months Ended
Sep. 29, 2018
Retirement Benefits [Abstract]  
Schedule of Components of Net Periodic Benefit (Credit) Costs for Pensions and Other Postretirement Benefits
The components of net periodic benefit (credits) costs for pension and other postretirement benefits, for Company sponsored plans, are provided below:
 
13-Weeks Ended
 
Pension Benefits
 
Other Postretirement Plans
 
September 29, 2018
 
September 30, 2017
 
September 29, 2018
 
September 30, 2017
Components of net periodic benefit (credits) costs
 
 
 
 
 
 
 
Service cost
$
536

 
$
755

 
$
9

 
$
7

Interest cost
9,076

 
9,329

 
58

 
68

Expected return on plan assets
(12,890
)
 
(11,943
)
 
—

 
—

Amortization of prior service cost
1

 
35

 
2

 
2

Amortization of net loss (gain)
620

 
785

 
(39
)
 
(86
)
     Settlements
—

 
1,000

 
—

 
—

Net periodic (credits) benefit costs
$
(2,657
)
 
$
(39
)
 
$
30

 
$
(9
)
 
 
 
 
 
 
 
 
 
39-Weeks Ended
 
Pension Benefits
 
Other Postretirement Plans
 
September 29, 2018
 
September 30, 2017
 
September 29, 2018
 
September 30, 2017
Components of net periodic benefit (credits) costs
 
 
 
 
 
 
 
Service cost
$
1,670

 
$
1,767

 
$
26

 
$
26

Interest cost
26,738

 
29,606

 
176

 
212

Expected return on plan assets
(38,488
)
 
(35,871
)
 
—

 
—

Amortization of prior service cost
3

 
104

 
5

 
5

Amortization of net loss (gain)
2,236

 
2,886

 
(117
)
 
(112
)
     Settlements
—

 
3,000

 
—

 
—

Net periodic (credits) benefit costs
$
(7,841
)
 
$
1,492

 
$
90

 
$
131