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Employee Benefit Plans (Tables)
 6 Months Ended
May 28, 2017
Retirement Benefits [Abstract]  
Schedule of defined benefit plans disclosures
The following tables summarize the components of net periodic benefit cost and the changes recognized in "Accumulated other comprehensive loss" for the Company’s defined benefit pension plans and postretirement benefit plans: 
 
Pension Benefits
 
Postretirement Benefits
 
Three Months Ended
 
Three Months Ended
 
May 28,
2017
 
May 29,
2016
 
May 28,
2017
 
May 29,
2016
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
2,479

 
$
2,072

 
$
43

 
$
50

Interest cost
9,188

 
9,490

 
787

 
806

Expected return on plan assets
(12,122
)
 
(12,162
)
 
—

 
—

Amortization of prior service benefit
(15
)
 
(16
)
 
—

 
—

Amortization of actuarial loss
3,379

 
3,028

 
317

 
741

Curtailment loss
67

 
—

 
—

 
—

Net settlement loss
94

 
—

 
—

 
—

Net periodic benefit cost
3,070

 
2,412

 
1,147

 
1,597

Changes in accumulated other comprehensive loss:
 
 
 
 
 
 
 
Actuarial loss
6

 
18

 
—

 
—

Amortization of prior service benefit
15

 
16

 
—

 
—

Amortization of actuarial loss
(3,379
)
 
(3,028
)
 
(317
)
 
(741
)
Net settlement loss
(94
)
 
—

 
—

 
—

Total recognized in accumulated other comprehensive loss
(3,452
)
 
(2,994
)
 
(317
)
 
(741
)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss
$
(382
)
 
$
(582
)
 
$
830

 
$
856



 
Pension Benefits
 
Postretirement Benefits
 
Six Months Ended
 
Six Months Ended
 
May 28,
2017
 
May 29,
2016
 
May 28,
2017
 
May 29,
2016
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
4,942

 
$
4,130

 
$
86

 
$
100

Interest cost
18,368

 
18,962

 
1,574

 
1,612

Expected return on plan assets
(24,237
)
 
(24,296
)
 
—

 
—

Amortization of prior service benefit
(30
)
 
(31
)
 
—

 
—

Amortization of actuarial loss
6,758

 
6,035

 
635

 
1,483

Curtailment loss
67

 
—

 
—

 
—

Net settlement loss
94

 
—

 
—

 
—

Net periodic benefit cost
5,962

 
4,800

 
2,295

 
3,195

Changes in accumulated other comprehensive loss:
 
 
 
 
 
 
 
Actuarial (gain) loss
(3
)
 
170

 
—

 
—

Amortization of prior service benefit
30

 
31

 
—

 
—

Amortization of actuarial loss
(6,758
)
 
(6,035
)
 
(635
)
 
(1,483
)
Net settlement loss
(94
)
 
—

 
—

 
—

Total recognized in accumulated other comprehensive loss
(6,825
)
 
(5,834
)
 
(635
)
 
(1,483
)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss
$
(863
)
 
$
(1,034
)
 
$
1,660

 
$
1,712