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Retirement Plans (Tables)
 8 Months Ended
Sep. 12, 2015
Compensation and Retirement Disclosure [Abstract]  
Summary of Net Pension and SERP Expense Recognized
A summary of net pension and Supplemental Executive Retirement Plan expense recognized by the Company is as follows:
 
12 Weeks Ended
 
36 Weeks Ended
(In millions)
September 12,
2015
 
September 6,
2014
 
September 12,
2015
 
September 6,
2014
Service cost pertaining to benefits earned during the period
$
2.1

 
$
1.7

 
$
6.3

 
$
5.0

Interest cost on projected benefit obligations
4.2

 
4.8

 
12.7

 
14.1

Expected return on pension assets
(4.7
)
 
(5.2
)
 
(14.2
)
 
(15.4
)
Net amortization loss
4.8

 
1.7

 
14.5

 
5.2

Net pension expense
$
6.4

 
$
3.0

 
$
19.3

 
$
8.9