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Retirement and Other Benefit Plans (Tables)
 9 Months Ended
Nov. 03, 2018
Retirement Benefits [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)
November 3, 2018

October 28, 2017

November 3, 2018

October 28, 2017

Service cost
$
2,240

$
2,426

$
—

$
—

Interest cost
3,546

3,736

15

17

Expected return on assets
(7,253
)
(6,896
)
—

—

Amortization of:
 

 

 

 

Actuarial loss (gain)
1,030

1,090

(31
)
(36
)
Prior service income
(392
)
(439
)
—

—

Curtailment cost
—

36

—

—

Total net periodic benefit income
$
(829
)
$
(47
)
$
(16
)
$
(19
)
 
 
 
 
 
 
 
 
 
 
 
Pension Benefits
Other Postretirement Benefits
 
Thirty-Nine Weeks Ended
Thirty-Nine Weeks Ended
($ thousands)
November 3, 2018

October 28, 2017

November 3, 2018

October 28, 2017

Service cost
$
6,717

$
7,276

$
—

$
—

Interest cost
10,636

11,210

44

51

Expected return on assets
(21,757
)
(20,689
)
—

—

Amortization of:
 
 
 
 
Actuarial loss (gain)
3,092

3,238

(93
)
(109
)
Prior service income
(1,176
)
(1,335
)
—

—

Curtailment cost
—

36

—

—

Total net periodic benefit income
$
(2,488
)
$
(264
)
$
(49
)
$
(58
)