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Retirement and Other Benefit Plans (Tables)
 9 Months Ended
Oct. 28, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Components of Net Periodic Benefit 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)
October 28, 2017

October 29, 2016

October 28, 2017

October 29, 2016

Service cost
$
2,426

$
2,084

$
—

$
—

Interest cost
3,736

3,835

17

15

Expected return on assets
(6,896
)
(7,237
)
—

—

Amortization of:
 

 

 

 

Actuarial loss (gain)
1,090

38

(36
)
(55
)
Prior service income
(439
)
(461
)
—

—

Curtailment cost
36

—

—

—

Total net periodic benefit income
$
(47
)
$
(1,741
)
$
(19
)
$
(40
)
 
 
 
 
 
 
Pension Benefits
Other Postretirement Benefits
 
Thirty-nine Weeks Ended
Thirty-nine Weeks Ended
($ thousands)
October 28, 2017

October 29, 2016

October 28, 2017

October 29, 2016

Service cost
$
7,276

$
6,251

$
—

$
—

Interest cost
11,210

11,506

51

45

Expected return on assets
(20,689
)
(21,712
)
—

—

Amortization of:
 
 
 
 
Actuarial loss (gain)
3,238

115

(109
)
(165
)
Prior service income
(1,335
)
(1,382
)
—

—

Settlement cost
—

250

—

—

Curtailment cost
36

—

—

—

Total net periodic benefit income
$
(264
)
$
(4,972
)
$
(58
)
$
(120
)