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Pension, Postretirement and Postemployment Benefits (Tables)
 12 Months Ended
Dec. 27, 2015
Pension, Postretirement and Postemployment Benefits [Abstract]  
Summary of Changes in Projected Benefit Obligation, Plan Assets and Funded Status
Reconciliations of the beginning and ending balances for the projected benefit obligation, the fair value of plan assets and the funded status are included below for the years ended December 27, 2015 and December 28, 2014.

 
Pension
 
Postretirement
        
 
2015
 
2014
 
2015
 
2014
Change in Projected Benefit Obligation
        
Projected benefit obligation – beginning
$
383,068
 
332,774
 
28,017
 
27,174
Service cost
 
1,918
 
1,824
 
567
 
543
Interest cost
 
15,683
 
16,209
 
1,154
 
1,337
Actuarial (gain) loss
 
(17,968)
 
59,640
 
(741)
 
796
Curtailment
 
660
 
-
 
(746)
 
-
Benefits paid
 
(20,202)
 
(25,690)
 
(2,004)
 
(1,833)
Expenses paid
 
(2,099)
 
(1,689)
 
-
 
-
Projected benefit obligation – ending
$
361,060
 
383,068
 
26,247
 
28,017
Accumulated benefit obligation – ending
$
361,060
 
383,068
 
26,247
 
28,017
         
Change in Plan Assets
        
Fair value of plan assets – beginning
$
272,010
 
273,337
 
-
 
-
Actual return on plan assets
 
(3,414)
 
20,385
 
-
 
-
Employer contribution
 
13,034
 
5,667
 
-
 
-
Benefits paid
 
(20,202)
 
(25,690)
 
-
 
-
Expenses paid
 
(2,099)
 
(1,689)
 
-
 
-
Fair value of plan assets – ending
$
259,329
 
272,010
 
-
 
-
         
Reconciliation of Funded Status
        
Projected benefit obligation
$
(361,060)
 
(383,068)
 
(26,247)
 
(28,017)
Fair value of plan assets
 
259,329
 
272,010
 
-
 
-
Funded status
 
(101,731)
 
(111,058)
 
(26,247)
 
(28,017)
Unrecognized net loss
 
120,482
 
123,968
 
41
 
782
Unrecognized prior service cost (credit)
 
-
 
187
 
-
 
(3,401)
Net amount recognized
$
18,751
 
13,097
 
(26,206)
 
(30,636)
         
Accrued liabilities
$
(2,663)
 
(2,990)
 
(1,800)
 
(2,100)
Other liabilities
 
(99,068)
 
(108,068)
 
(24,447)
 
(25,917)
Accumulated other comprehensive earnings (loss)
 
120,482
 
124,155
 
41
 
(2,619)
Net amount recognized
$
18,751
 
13,097
 
(26,206)
 
(30,636)
Assumptions used to determine year-end pension and postretirement benefit obligations
Assumptions used to determine the year-end pension and postretirement benefit obligations are as follows:

 
2015
 
2014
Pension
   
Weighted average discount rate
4.58%
 
4.19%
    
Mortality table
RP-2014/Scale BB
 
RP-2014/Scale BB
    
Postretirement
   
Discount rate
4.64%
 
4.23%
Health care cost trend rate assumed for next year
7.00%
 
6.50%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)
5.00%
 
5.00%
Year that the rate reaches the ultimate trend
2021
 
2020
Fair Values of Plan Assets by Asset Class and Fair Value Hierarchy Level
The assets of the funded plans are managed by investment advisors. The fair values of the plan assets by asset class and fair value hierarchy level (as described in note 12) as of December 27, 2015 and December 28, 2014 are as follows:

   
Fair value measurements using:
 
Fair Value
 
Quoted Prices in Active Markets For Identical Assets
(Level 1)
 
Significant Other Observable Inputs
(Level 2)
 
Significant Unobservable Inputs
(Level 3)
2015:
        
Equity:
        
Large Cap
$
27,600
 
27,600
 
-
 
-
Small Cap
 
24,300
 
24,300
 
-
 
-
International
 
37,500
 
-
 
37,500
 
-
Other
 
2,500
 
-
 
-
 
2,500
Fixed Income
 
122,600
 
-
 
122,600
 
-
Total Return Fund
 
27,700
 
-
 
27,700
 
-
Cash Equivalents
 
17,100
 
-
 
17,100
 
-
 
$
259,300
 
51,900
 
204,900
 
2,500
         
2014:
        
Equity:
        
Large Cap
$
14,100
 
14,100
 
-
 
-
Small Cap
 
18,000
 
18,000
 
-
 
-
International
 
34,300
 
-
 
34,300
 
-
Other
 
36,400
 
-
 
-
 
36,400
Fixed Income
 
132,100
 
-
 
110,100
 
22,000
Total Return Fund
 
28,600
 
-
 
28,600
 
-
Cash Equivalents
 
8,500
 
-
 
8,500
 
-
 
$
272,000
 
32,100
 
181,500
 
58,400
Components of Net Periodic Benefit Cost
The following is a detail of the components of the net periodic benefit cost for the three years ended December 27, 2015.

 
2015
 
2014
 
2013
Components of Net Periodic Cost
      
       
Pension
      
Service cost
$
1,918
 
1,824
 
2,579
Interest cost
 
15,683
 
16,209
 
15,597
Expected return on assets
 
(18,538)
 
(18,631)
 
(17,761)
Amortization of prior service cost
 
65
 
98
 
98
Amortization of actuarial loss
 
7,468
 
3,351
 
7,070
Curtailment/settlement losses
 
781
 
-
 
6,993
Net periodic benefit cost
$
7,377
 
2,851
 
14,576
       
Postretirement
      
Service cost
$
567
 
543
 
750
Interest cost
 
1,154
 
1,337
 
1,380
Amortization of actuarial (gain) loss
 
(304)
 
(457)
 
(264)
Curtailment
 
(3,842)
 
-
 
-
Net periodic benefit cost (income)
$
(2,425)
 
1,423
 
1,866

See note 17 for additional information on 2015 curtailment.
Assumptions Used to Determine Net Periodic Benefit Cost of Pension Plan and Postretirement Plan
Assumptions used to determine net periodic benefit cost of the pension plan and postretirement plan for each fiscal year follow:

 
2015
 
2014
 
2013
Pension
     
Weighted average discount rate
4.22%
 
5.02%
 
4.49%
Long-term rate of return on plan assets
7.00%
 
7.00%
 
7.00%
      
Postretirement
     
Discount rate
4.49%
 
5.11%
 
4.34%
Health care cost trend rate assumed for next year
6.50%
 
7.00%
 
7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)
5.00%
 
5.00%
 
5.00%
Year that the rate reaches the ultimate trend rate
2020
 
2020
 
2020
Schedule of Expected Benefit Payments
Expected benefit payments under the defined benefit pension plans and the postretirement benefit plan for the next five years subsequent to 2015 and in the aggregate for the following five years are as follows:

 
Pension
 
Postretirement
2016
$
19,501
 
1,850
2017
 
20,036
 
1,657
2018
 
20,576
 
1,615
2019
 
20,955
 
1,553
2020
 
21,249
 
1,504
2021-2025
 
115,117
 
6,934