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Retirement and Other Benefit Plans (Tables)
 3 Months Ended
May 04, 2019
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)
May 4, 2019

May 5, 2018

May 4, 2019

May 5, 2018

Service cost
$
1,854

$
2,382

$
—

$
—

Interest cost
3,725

3,541

15

15

Expected return on assets
(6,892
)
(7,232
)
—

—

Amortization of:
 

 

 

 

Actuarial loss (gain)
928

1,013

(30
)
(30
)
Prior service income
(365
)
(398
)
—

—

Total net periodic benefit income
$
(750
)
$
(694
)
$
(15
)
$
(15
)