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Retirement Plans | 8 Months Ended
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Sep. 10, 2016
Compensation and Retirement Disclosure [Abstract] |
Retirement Plans | RETIREMENT PLANS 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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