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Financial Instruments (Tables) | 6 Months Ended
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Jun. 26, 2016
Financial Instruments (Thousands of Dollars) [Abstract] |
Schedule of Long-term Debt Instruments |
| June 26, 2016 |  | June 28, 2015 |  | December 27, 2015
| Carrying |  | Fair |  | Carrying |  | Fair |  | Carrying |  | Fair
| Cost |  | Value |  | Cost |  | Value |  | Cost |  | Value
6.35% Notes Due 2040 | $ | 500,000 |  |  | 608,600 |  |  | 500,000 |  |  | 557,450 |  |  | 500,000 |  |  | 556,300
6.30% Notes Due 2017 |  | 350,000 |  |  | 370,125 |  |  | 350,000 |  |  | 382,235 |  |  | 350,000 |  |  | 374,045
5.10% Notes Due 2044 |  | 300,000 |  |  | 317,490 |  |  | 300,000 |  |  | 287,010 |  |  | 300,000 |  |  | 286,710
3.15% Notes Due 2021 |  | 300,000 |  |  | 308,640 |  |  | 300,000 |  |  | 301,800 |  |  | 300,000 |  |  | 300,060
6.60% Debentures Due 2028 |  | 109,895 |  |  | 133,006 |  |  | 109,895 |  |  | 121,115 |  |  | 109,895 |  |  | 121,269
Total long-term debt | $ | 1,559,895 |  |  | 1,737,861 |  |  | 1,559,895 |  |  | 1,649,610 |  |  | 1,559,895 |  |  | 1,638,384
Less: Deferred debt expenses |  | 12,142 |  |  | - |  |  | 13,418 |  |  | - |  |  | 12,780 |  |  | -
Long-term debt | $ | 1,547,753 |  |  | 1,737,861 |  |  | 1,546,477 |  |  | 1,649,610 |  |  | 1,547,115 |  |  | 1,638,384

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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