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Postretirement Benefits (Tables)
 12 Months Ended
Dec. 29, 2019
Defined Benefit Plan [Abstract]  
Schedule of Net Funded Status [Table Text Block]
The following was the change in benefit obligation, plan assets and funded status at December 29, 2019 and December 30, 2018:
 
 
December 29, 2019
 
December 30, 2018
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
4,320

 
$
4,838

Service cost
145

 
196

Interest cost
150

 
178

Plan participants' contributions
95

 
97

Actuarial gain
(1,972
)
 
(894
)
Benefits paid
(198
)
 
(99
)
Medicare part D prescription drug subsidy
15

 
4

Benefit obligation at end of year
$
2,555

 
$
4,320

Change in plan assets:
 

 
 

Fair value of plan assets at beginning of year
$
—

 
$
—

Employer contribution (refunds)
88

 
(2
)
Plan participants' contributions
95

 
97

Benefits paid
(198
)
 
(99
)
Medicare part D prescription drug subsidy
15

 
4

Fair value of plan assets at end of year
—

 
—

Funded status
$
(2,555
)
 
$
(4,320
)
Weighted average assumptions:
 

 
 

Discount rate used to determine benefit obligations
2.62
%
 
4.17
%
Discount rate used to determine net periodic benefit cost
4.17
%
 
3.60
%
Schedule of Net Benefit Costs [Table Text Block]
Components of net periodic postretirement benefit expense recognized in the consolidated statements of comprehensive income were:
 
Year ended
 
December 29, 2019
 
December 30, 2018
 
December 31, 2017
Service cost
$
145

 
$
196

 
$
192

Interest cost
150

 
178

 
191

Amortization of net loss
66

 
208

 
222

Amortization of prior service credit
(350
)
 
(352
)
 
(355
)
Net periodic postretirement benefit expense
$
11

 
$
230

 
$
250
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]
Amounts recognized in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit expense, consisted of:
 
Year ended
 
December 29, 2019
 
December 30, 2018
Prior service credit
$
913

 
$
1,265

Net gain (loss)
210

 
(1,826
)
Deferred income taxes
(501
)
 
(85
)
Accumulated other comprehensive loss
$
622

 
$
(646
)
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
The following table reflects the changes in accumulated other comprehensive loss for the years ended December 29, 2019 and December 30, 2018:  
 
Year ended
 
December 29, 2019
 
December 30, 2018
Actuarial gain
$
(1,972
)
 
$
(894
)
Amortization of net loss
(66
)
 
(208
)
Amortization of prior service credit
350

 
352

Deferred income taxes
420

 
186

Total recognized in accumulated other comprehensive loss
$
(1,268
)
 
$
(564
)
Schedule of Health Care Cost Trend Rates [Table Text Block]
Assumed health care cost trend rates at the years ended were as follows:      
 
December 29, 2019
 
December 30, 2018
 
December 31, 2017
Medical benefits cost trend rate assumed for the following year pre-65
6.75
%
 
7.00
%
 
7.25
%
Medical benefits cost trend rate assumed for the following year post-65
4.50
%
 
5.00
%
 
6.25
%
Prescription drug cost trend rate assumed for the following year
7.00
%
 
9.50
%
 
10.50
%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
3.78
%
 
3.78
%
 
3.89
%
Year that the rate reaches the ultimate trend rate
2075

 
2075

 
2075
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
A one-percentage-point change in the assumed healthcare cost trend rates would have the following effects:  
 
1% Point Increase
 
1% Point Decrease
Effect on total of service and interest cost
$
80

 
$
58

Effect on postretirement benefit obligation
$
175

 
$
195