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Retirement Benefits
 9 Months Ended
Sep. 25, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Retirement Benefits
The components of net periodic benefit cost for retirement benefit plans were as follows (in thousands):
 
Thirteen Weeks Ended
 
Thirty-nine Weeks Ended
 
Sep 25,
2015
 
Sep 26,
2014
 
Sep 25,
2015
 
Sep 26,
2014
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
2,265

 
$
1,707

 
$
6,268

 
$
5,146

Interest cost
3,741

 
3,909

 
11,121

 
11,985

Expected return on assets
(5,010
)
 
(5,311
)
 
(14,586
)
 
(15,941
)
Amortization and other
2,291

 
1,341

 
7,070

 
4,029

Net periodic benefit cost
$
3,287

 
$
1,646

 
$
9,873

 
$
5,219

Postretirement Medical
 
 
 
 
 
 
 
Service cost
$
107

 
$
115

 
$
407

 
$
365

Interest cost
263

 
181

 
716

 
736

Amortization
(63
)
 
(229
)
 
(265
)
 
(483
)
Net periodic benefit cost
$
307

 
$
67

 
$
858

 
$
618