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Postretirement Benefits (Tables)
 12 Months Ended
Dec. 30, 2018
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 30, 2018 and December 31, 2017:
 
 
December 30, 2018
 
December 31, 2017
Change in benefit obligation:
 
 
 
Benefit obligation at beginning of year
$
4,838

 
$
4,566

Service cost
196

 
192

Interest cost
178

 
191

Plan participants' contributions
97

 
88

Actuarial gain
(894
)
 
(122
)
Benefits paid
(99
)
 
(115
)
Medicare part D prescription drug subsidy
4

 
38

Benefit obligation at end of year
$
4,320

 
$
4,838

Change in plan assets:
 

 
 

Fair value of plan assets at beginning of year
$
—

 
$
—

Employer refunds
(2
)
 
(11
)
Plan participants' contributions
97

 
88

Benefits paid
(99
)
 
(115
)
Medicare part D prescription drug subsidy
4

 
38

Fair value of plan assets at end of year
—

 
—

Funded status
$
(4,320
)
 
$
(4,838
)
Weighted average assumptions:
 

 
 

Discount rate used to determine benefit obligations
4.17
%
 
3.60
%
Discount rate used to determine net periodic benefit cost
3.60
%
 
4.11
%
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 30, 2018
 
December 31, 2017
 
January 1, 2017
Service cost
$
196

 
$
192

 
$
150

Interest cost
178

 
191

 
165

Amortization of net loss
208

 
222

 
197

Amortization of prior service credit
(352
)
 
(355
)
 
(355
)
Net periodic postretirement benefit expense
$
230

 
$
250

 
$
157
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 30, 2018
 
December 31, 2017
Prior service credit
$
1,265

 
$
1,617

Net loss
(1,826
)
 
(2,928
)
Deferred income taxes
(85
)
 
101

Accumulated other comprehensive loss
$
(646
)
 
$
(1,210
)
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 30, 2018 and December 31, 2017:  
 
Year ended
 
December 30, 2018
 
December 31, 2017
Actuarial gain
$
(894
)
 
$
(122
)
Amortization of net loss
(208
)
 
(222
)
Amortization of prior service credit
352

 
355

Deferred income taxes
186

 
(4
)
Total recognized in accumulated other comprehensive loss
$
(564
)
 
$
7
Schedule of Health Care Cost Trend Rates [Table Text Block]
Assumed health care cost trend rates at the years ended were as follows:      
 
December 30, 2018
 
December 31, 2017
 
January 1, 2017
Medical benefits cost trend rate assumed for the following year pre-65
7.00
%
 
7.25
%
 
7.50
%
Medical benefits cost trend rate assumed for the following year post-65
5.00
%
 
6.25
%
 
6.50
%
Prescription drug cost trend rate assumed for the following year
9.50
%
 
10.50
%
 
10.50
%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
3.78
%
 
3.89
%
 
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
$
103

 
$
75

Effect on postretirement benefit obligation
$
846

 
$
649