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Retirement Benefits | 9 Months Ended
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Sep. 25, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Retirement Benefits | 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 one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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