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Employee Benefit Plans
 3 Months Ended
Feb. 26, 2017
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
 
February 26,
2017
 
February 28,
2016
 
February 26,
2017
 
February 28,
2016
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
2,463

 
$
2,058

 
$
43

 
$
50

Interest cost
9,180

 
9,472

 
787

 
806

Expected return on plan assets
(12,115
)
 
(12,134
)
 
—

 
—

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

 
—

Amortization of actuarial loss
3,379

 
3,007

 
318

 
742

Net periodic benefit cost
2,892

 
2,388

 
1,148

 
1,598

Changes in accumulated other comprehensive loss:
 
 
 
 
 
 
 
Actuarial (gain) loss
(9
)
 
152

 
—

 
—

Amortization of prior service benefit
15

 
15

 
—

 
—

Amortization of actuarial loss
(3,379
)
 
(3,007
)
 
(318
)
 
(742
)
Total recognized in accumulated other comprehensive loss
(3,373
)
 
(2,840
)
 
(318
)
 
(742
)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss
$
(481
)
 
$
(452
)
 
$
830

 
$
856