Long-Term Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Debt Instrument [Line Items]
Carrying Cost	$ 1,709,895	$ 1,559,895
Long-Term Debt, Current Maturities	0	350,000
Deferred Debt Expenses	16,286	11,216
Long Term Debt	1,693,609	1,198,679
Fair Value	1,837,450	1,668,784
Long Term Debt Fair Value Current Maturities	0	361,900
Long Term Debt Fair Value Excluding Current Maturities	1,837,450	1,306,884
Aggregate Amount of Long-Term Debt Maturing in Next 5 Years	300,000
Fair value at date of interest rate swap contract settlement	33,306
Deferred Finance Costs Gross	6,122
Proceeds from Issuance of Long-term Debt	493,878	0	$ 0
Notes 6.35% Due 2040 [Member]
Debt Instrument [Line Items]
Carrying Cost	500,000	500,000
Fair Value	$ 601,800	584,850
Interest rate on long-term debt	6.35%
Long-term debt, principal amount	$ 500,000	500,000
Maturity Date	2040
Notes 6.30% Due 2017 [Member]
Debt Instrument [Line Items]
Carrying Cost	$ 0	350,000
Fair Value	$ 0	361,900
Interest rate on long-term debt	6.30%
Long-term debt, principal amount	$ 0	350,000
Debentures 6.60% Due 2028 [Member]
Debt Instrument [Line Items]
Carrying Cost	109,895	109,895
Fair Value	$ 131,390	123,984
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	$ 302,640	300,450
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	$ 313,320	297,600
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
Notes 3.50% Due 2027 [Member]
Debt Instrument [Line Items]
Carrying Cost	500,000
Fair Value	$ 488,300
Interest rate on long-term debt	3.50%
Long-term debt, principal amount	$ 500,000	$ 0
Maturity Date	2027

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

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- Definition

Interest rate swap contact settlement costs

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No definition available.

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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.

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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

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-SubTopic 10
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Face (par) amount of debt instrument at time of issuance.

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- Definition

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

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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.

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

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

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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.

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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.

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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.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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