Employee Benefit Plans (Tables)
 6 Months Ended
May 25, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of defined benefit plans disclosures
The following table summarizes 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 25,
2014
 
May 26,
2013
 
May 25,
2014
 
May 26,
2013
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
2,166

 
$
2,215

 
$
61

 
$
94

Interest cost
13,776

 
12,994

 
1,277

 
1,240

Expected return on plan assets
(14,036
)
 
(13,946
)
 
—

 
—

Amortization of prior service benefit
(19
)
 
(17
)
 
(2
)
 
(122
)
Amortization of actuarial loss
2,709

 
4,213

 
1,087

 
1,692

Curtailment loss (gain)
4,211

 
(510
)
 
33

 
—

Net settlement (gain) loss
(133
)
 
584

 
—

 
—

Net periodic benefit cost
8,674

 
5,533

 
2,456

 
2,904

Changes in accumulated other comprehensive loss:
 
 
 
 
 
 
 
Amortization of prior service benefit
19

 
17

 
2

 
122

Amortization of actuarial loss
(2,709
)
 
(4,213
)
 
(1,087
)
 
(1,692
)
Curtailment gain
115

 
949

 
—

 
—

Net settlement gain (loss)
29

 
(184
)
 
—

 
—

Total recognized in accumulated other comprehensive loss
(2,546
)
 
(3,431
)
 
(1,085
)
 
(1,570
)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss
$
6,128

 
$
2,102

 
$
1,371

 
$
1,334

 
Pension Benefits
 
Postretirement Benefits
 
Six Months Ended
 
Six Months Ended
 
May 25,
2014
 
May 26,
2013
 
May 25,
2014
 
May 26,
2013
 
(Dollars in thousands)
Net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
4,325

 
$
4,496

 
$
129

 
$
188

Interest cost
27,537

 
26,060

 
2,615

 
2,479

Expected return on plan assets
(27,879
)
 
(27,960
)
 
—

 
—

Amortization of prior service benefit
(36
)
 
(37
)
 
(3
)
 
(244
)
Amortization of actuarial loss
5,405

 
8,431

 
2,076

 
3,383

Curtailment loss (gain)
4,443

 
(510
)
 
733

 
—

Net settlement (gain) loss
(73
)
 
629

 
—

 
—

Net periodic benefit cost
13,722

 
11,109

 
5,550

 
5,806

Changes in accumulated other comprehensive loss:
 
 
 
 
 
 
 
Amortization of prior service benefit
36

 
37

 
3

 
244

Amortization of actuarial loss
(5,405
)
 
(8,431
)
 
(2,076
)
 
(3,383
)
Curtailment gain
115

 
509

 
—

 
—

Net settlement gain (loss)
4

 
(184
)
 
—

 
—

Total recognized in accumulated other comprehensive loss
(5,250
)
 
(8,069
)
 
(2,073
)
 
(3,139
)
Total recognized in net periodic benefit cost and accumulated other comprehensive loss
$
8,472

 
$
3,040

 
$
3,477

 
$
2,667