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Employee Benefit Plans
 9 Months Ended
Aug. 28, 2016
Compensation and Retirement Disclosure [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS
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
 
August 28,
2016
 
August 30,
2015
 
August 28,
2016
 
August 30,
2015
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
2,064

 
$
2,092

 
$
50

 
$
63

Interest cost(1)
9,453

 
11,796

 
805

 
1,147

Expected return on plan assets
(12,105
)
 
(12,715
)
 
—

 
—

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

 
—

Amortization of actuarial loss
3,005

 
3,149

 
742

 
1,127

Curtailment gain
(361
)
 
(118
)
 
—

 
—

Net settlement loss (gain)
21

 
(45
)
 
—

 
—

Net periodic benefit cost
2,062

 
4,144

 
1,597

 
2,337

Changes in accumulated other comprehensive loss:
 
 
 
 
 
 
 
Actuarial loss
—

 
(579
)
 
—

 
—

Amortization of prior service benefit
15

 
15

 
—

 
—

Amortization of actuarial loss
(3,005
)
 
(3,149
)
 
(742
)
 
(1,127
)
Curtailment gain
396

 
118

 
—

 
—

Net settlement (loss) gain
(21
)
 
45

 
—

 
—

Total recognized in accumulated other comprehensive loss
(2,615
)
 
(3,550
)
 
(742
)
 
(1,127
)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss
$
(553
)
 
$
594

 
$
855

 
$
1,210

_____________
 
(1)
The decrease in interest cost is primarily due to the election made at the end of 2015 to adopt the spot-rate approach to determine the interest cost component of pension and postretirement expense.

 
Pension Benefits
 
Postretirement Benefits
 
Nine Months Ended
 
Nine Months Ended
 
August 28,
2016
 
August 30,
2015
 
August 28,
2016
 
August 30,
2015
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
6,194

 
$
6,310

 
$
150

 
$
188

Interest cost(1)
28,415

 
35,426

 
2,417

 
3,441

Expected return on plan assets
(36,401
)
 
(38,148
)
 
—

 
—

Amortization of prior service benefit
(46
)
 
(46
)
 
—

 
—

Amortization of actuarial loss
9,040

 
9,472

 
2,225

 
3,383

Curtailment (gain) loss, net
(361
)
 
269

 
—

 
—

Net settlement loss (gain)
21

 
(45
)
 
—

 
—

Net periodic benefit cost
6,862

 
13,238

 
4,792

 
7,012

Changes in accumulated other comprehensive loss:
 
 
 
 
 
 
 
Actuarial loss
170

 
(579
)
 
—

 
—

Amortization of prior service benefit
46

 
46

 
—

 
—

Amortization of actuarial loss
(9,040
)
 
(9,472
)
 
(2,225
)
 
(3,383
)
Curtailment gain (loss)
396

 
(269
)
 
—

 
—

Net settlement (loss) gain
(21
)
 
45

 
—

 
—

Total recognized in accumulated other comprehensive loss
(8,449
)
 
(10,229
)
 
(2,225
)
 
(3,383
)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss
$
(1,587
)
 
$
3,009

 
$
2,567

 
$
3,629


_____________
 
(1)
The decrease in interest cost is primarily due to the election made at the end of 2015 to adopt the spot-rate approach to determine the interest cost component of pension and postretirement expense.