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Retirement and Other Benefit Plans (Tables) | 6 Months Ended
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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 | )

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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