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Retirement plans (Tables) (Pension Plans, Defined Benefit [Member])
 6 Months Ended
Jun. 29, 2014
Pension Plans, Defined Benefit [Member]
  
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. 29, 2014
 
Jun. 30, 2013
 
Jun. 29, 2014
 
Jun. 30, 2013
 
 
 
 
 
 
 
 
Service cost-benefits earned during the period
$
877

 
$
1,756

 
$
2,708

 
$
3,881

Interest cost on benefit obligation
42,372

 
35,071

 
84,738

 
70,254

Expected return on plan assets
(59,174
)
 
(49,299
)
 
(117,748
)
 
(98,842
)
Amortization of prior service cost
1,901

 
1,898

 
3,783

 
3,776

Amortization of actuarial loss
11,674

 
16,190

 
22,901

 
31,550

Expense (credit) for company-sponsored retirement plans
$
(2,350
)
 
$
5,616

 
$
(3,618
)
 
$
10,619