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Retirement Benefits (Tables) | 9 Months Ended
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Sep. 25, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic benefit cost for retirement benefit plans were as follows (in thousands):
| Thirteen Weeks Ended |  | Thirty-nine Weeks Ended
| Sep 25, 2015 |  | Sep 26, 2014 |  | Sep 25, 2015 |  | Sep 26, 2014
Pension Benefits |  |  |  |  |  |  |
Service cost | $ | 2,265 |  |  | $ | 1,707 |  |  | $ | 6,268 |  |  | $ | 5,146 |
Interest cost | 3,741 |  |  | 3,909 |  |  | 11,121 |  |  | 11,985 |
Expected return on assets | (5,010 | ) |  | (5,311 | ) |  | (14,586 | ) |  | (15,941 | )
Amortization and other | 2,291 |  |  | 1,341 |  |  | 7,070 |  |  | 4,029 |
Net periodic benefit cost | $ | 3,287 |  |  | $ | 1,646 |  |  | $ | 9,873 |  |  | $ | 5,219 |
Postretirement Medical |  |  |  |  |  |  |
Service cost | $ | 107 |  |  | $ | 115 |  |  | $ | 407 |  |  | $ | 365 |
Interest cost | 263 |  |  | 181 |  |  | 716 |  |  | 736 |
Amortization | (63 | ) |  | (229 | ) |  | (265 | ) |  | (483 | )
Net periodic benefit cost | $ | 307 |  |  | $ | 67 |  |  | $ | 858 |  |  | $ | 618 |

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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=58740216&loc=d3e1928-114920 + Details
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