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Retirement and Other Benefit Plans (Tables)
 6 Months Ended
Jul. 29, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Components of Net Periodic Benefit Cost (Income)
The following table sets forth the components of net periodic benefit income for the Company, including domestic and Canadian plans:
 
Pension Benefits
Other Postretirement Benefits
 
Thirteen Weeks Ended
Thirteen Weeks Ended
($ thousands)
July 29, 2017

July 30, 2016

July 29, 2017

July 30, 2016

Service cost
$
2,383

$
1,904

$
—

$
—

Interest cost
3,727

3,810

16

15

Expected return on assets
(6,913
)
(7,252
)
—

—

Amortization of:
 

 

 

 

Actuarial loss (gain)
996

39

(35
)
(55
)
Prior service income
(461
)
(461
)
—

—

Settlement cost
—

250

—

—

Total net periodic benefit income
$
(268
)
$
(1,710
)
$
(19
)
$
(40
)
 
 
 
 
 
 
Pension Benefits
Other Postretirement Benefits
 
Twenty-six Weeks Ended
Twenty-six Weeks Ended
($ thousands)
July 29, 2017

July 30, 2016

July 29, 2017

July 30, 2016

Service cost
$
4,850

$
4,167

$
—

$
—

Interest cost
7,474

7,671

34

30

Expected return on assets
(13,793
)
(14,475
)
—

—

Amortization of:
 
 
 
 
Actuarial loss (gain)
2,148

77

(73
)
(110
)
Prior service income
(896
)
(921
)
—

—

Settlement cost
—

250

—

—

Total net periodic benefit income
$
(217
)
$
(3,231
)
$
(39
)
$
(80
)