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Benefit Plans (Tables)
 4 Months Ended
Jun. 16, 2018
Retirement Benefits [Abstract]  
Net Periodic Benefit Expense and Contributions for Defined Benefit Pension Plans and Other Postretirement Benefit Plans
Net periodic benefit income and contributions for defined benefit pension and other postretirement benefit plans consisted of the following:
 
First Quarter Ended
Pension Benefits
 
Other Postretirement Benefits
June 16, 
 2018 
 (16 weeks)
 
June 17, 
 2017 
 (16 weeks)
 
June 16, 
 2018 
 (16 weeks)
 
June 17, 
 2017 
 (16 weeks)
Interest cost
$
28

 
$
24

 
$
—

 
$
—

Expected return on assets
(40
)
 
(40
)
 
—

 
—

Amortization of prior service benefit
—

 
—

 
(4
)
 
(5
)
Amortization of net actuarial loss
4

 
3

 
—

 
1

Net periodic benefit income
$
(8
)
 
$
(13
)
 
$
(4
)
 
$
(4
)
Contributions to benefit plans
$
(5
)
 
$
(1
)
 
$
—

 
$
—