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Retirement Plans (Tables)
 6 Months Ended
Jun. 28, 2015
Retirement Plans  
Defined Benefit Plan Disclosure [Line Items]  
Benefit costs
Our retirement plan costs include costs for qualified and nonqualified plans and are presented in the following table:
In thousands
Thirteen Weeks Ended
 
Twenty-six Weeks Ended
 
Jun. 28, 2015
 
Jun. 29, 2014
 
Jun. 28, 2015
 
Jun. 29, 2014
 
 
 
 
 
 
 
 
Service cost-benefits earned during the period
$
1,340

 
$
877

 
$
2,674

 
$
2,708

Interest cost on benefit obligation
38,462

 
42,372

 
76,789

 
84,738

Expected return on plan assets
(56,252
)
 
(59,174
)
 
(112,321
)
 
(117,748
)
Amortization of prior service cost
1,882

 
1,901

 
3,764

 
3,783

Amortization of actuarial loss
15,313

 
11,674

 
30,608

 
22,901

Expense (credit) for company-sponsored retirement plans
$
745

 
$
(2,350
)
 
$
1,514

 
$
(3,618
)