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Retirement Plans (Tables) | 8 Months Ended
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Sep. 10, 2016
Compensation and Retirement Disclosure [Abstract] |
Summary of Net Pension and SERP Expense Recognized | The following is a summary of net pension and Supplemental Executive Retirement Plan expense recognized by the Company.
| 12 Weeks Ended |  | 36 Weeks Ended
(In millions) | September 10, 2016 |  | September 12, 2015 |  | September 10, 2016 |  | September 12, 2015
Service cost pertaining to benefits earned during the period | $ | 1.5 |  |  | $ | 2.1 |  |  | $ | 4.5 |  |  | $ | 6.3 |
Interest cost on projected benefit obligations | 4.5 |  |  | 4.2 |  |  | 13.3 |  |  | 12.7 |
Expected return on pension assets | (4.6 | ) |  | (4.7 | ) |  | (13.9 | ) |  | (14.2 | )
Net amortization loss | 1.1 |  |  | 4.8 |  |  | 3.4 |  |  | 14.5 |
Net pension expense | $ | 2.5 |  |  | $ | 6.4 |  |  | $ | 7.3 |  |  | $ | 19.3 |

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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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