Long-Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 25, 2016	Dec. 27, 2015
Debt Instrument [Line Items]
Carrying Cost	$ 1,559,895	$ 1,559,895
Long-Term Debt, Current Maturities	350,000	0
Deferred Debt Expenses	11,216	12,780
Long Term Debt	1,198,679	1,547,115
Fair Value	1,668,784	1,638,384
Long Term Debt Fair Value Current Maturities	361,900	0
Long Term Debt Fair Value Excluding Current Maturities	1,306,884	1,638,384
Aggregate Amount of Long-Term Debt Maturing in Next 5 Years	650,000
Fair value at date of interest rate swap contract settlement	33,306
Notes 6.35% Due 2040 [Member]
Debt Instrument [Line Items]
Carrying Cost	500,000	500,000
Fair Value	$ 584,850	556,300
Interest rate on long-term debt	6.35%
Long-term debt, principal amount	$ 500	500
Maturity Date	2040
Notes 6.30% Due 2017 [Member]
Debt Instrument [Line Items]
Carrying Cost	$ 350,000	350,000
Fair Value	$ 361,900	374,045
Interest rate on long-term debt	6.30%
Long-term debt, principal amount	$ 650,000	$ 650,000
Maturity Date	2017
Range of interest rate adjustment dependent on the degree of decrease of the Company's credit rating, minimum	0.25%	0.25%
Range of interest rate adjustment dependent on the degree of decrease of the Company's credit rating, maximum	2.00%	2.00%
Debentures 6.60% Due 2028 [Member]
Debt Instrument [Line Items]
Carrying Cost	$ 109,895	$ 109,895
Fair Value	$ 123,984	121,269
Interest rate on long-term debt	6.60%
Long-term debt, principal amount	$ 109,895	109,895
Maturity Date	2028
Notes 3.15% Due 2021 Member [Member]
Debt Instrument [Line Items]
Carrying Cost	$ 300,000	300,000
Fair Value	$ 300,450	300,060
Interest rate on long-term debt	3.15%
Long-term debt, principal amount	$ 300,000	300,000
Maturity Date	2021
Fair value at date of interest rate swap contract settlement	$ 6,373
Notes 5.10% Due 2044 [Member]
Debt Instrument [Line Items]
Carrying Cost	300,000	300,000
Fair Value	$ 297,600	286,710
Interest rate on long-term debt	5.10%
Long-term debt, principal amount	$ 300,000	$ 300,000
Maturity Date	2044
Fair value at date of interest rate swap contract settlement	$ 26,933

Aggregate Amount of Long-Term Debt Maturing in Next 5 Years

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- Definition

The maximum adjustment to the effective interest rate borrowed under a debt instrument.

+ References

No definition available.

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- Definition

The minimum adjustment to the effective interest rate borrowed under a debt instrument.

+ References

No definition available.

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- Definition

Interest rate swap contact settlement costs

+ References

No definition available.

+ Details

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- Definition

Fair value amount of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

No definition available.

+ Details

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- Definition

Fair value amount of long-term debt, classified as non-current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

No definition available.

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- Definition

Year when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc)

+ References

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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))
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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: 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=64930739&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1
-Subparagraph (SX 210.5-02.17)
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

No definition available.

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