Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010	Dec. 26, 2010
Debt Instrument [Line Items]
Carrying Cost	$ 1,405,071	$ 1,404,556	$ 1,405,071	$ 1,404,556	$ 1,397,681
Fair Value	1,538,000	1,479,663	1,538,000	1,479,663	1,455,466
Principal amount	1,384,895	1,384,895	1,384,895	1,384,895	1,384,895
Total long-term debt	1,405,071	1,404,556	1,405,071	1,404,556	1,397,681
Notes 6.125% Due 2014 [Member]
Debt Instrument [Line Items]
Carrying Cost	445,176	444,661	445,176	444,661	437,786
Fair Value	467,245	466,225	467,245	466,225	462,698
Maturity Date	2,014	2,014	2,014	2,014	2,014
Interest Rate	6.125%	6.125%	6.125%	6.125%	6.125%
Principal amount	425,000	425,000	425,000	425,000	425,000
Notes 6.30% Due 2017 [Member]
Debt Instrument [Line Items]
Carrying Cost	350,000	350,000	350,000	350,000	350,000
Fair Value	402,780	388,290	402,780	388,290	382,830
Maturity Date	2,017	2,017	2,017	2,017	2,017
Interest Rate	6.30%	6.30%	6.30%	6.30%	6.30%
Principal amount	350,000	350,000	350,000	350,000	350,000
Debentures 6.60% Due 2028 [Member]
Debt Instrument [Line Items]
Carrying Cost	109,895	109,895	109,895	109,895	109,895
Fair Value	120,775	114,148	120,775	114,148	110,038
Maturity Date	2,028	2,028	2,028	2,028	2,028
Interest Rate	6.60%	6.60%	6.60%	6.60%	6.60%
Principal amount	109,895	109,895	109,895	109,895	109,895
Notes635 Due2040 Member
Debt Instrument [Line Items]
Carrying Cost	500,000	500,000	500,000	500,000	500,000
Fair Value	547,200	511,000	547,200	511,000	499,900
Maturity Date	2,040	2,040	2,040	2,040	2,040
Interest Rate	6.35%	6.35%	6.35%	6.35%	6.35%
Principal amount	500,000	500,000	500,000	500,000	500,000
Interest Rate Swap 6.125% Note Due 2014 [Member]
Debt Instrument [Line Items]
Fair value adjustment, interest rate swap	20,176	19,661	20,176	19,661	12,786
Derivative [Line Items]
Interest rate swap notional amount	400,000	400,000	400,000	400,000	400,000
Interest rate swap maturity date	2,014	2,014	2,014	2,014	2,014
Fair value, interest rate swap	20,176	19,661	20,176	19,661	12,786
Gain (loss) from interest rate swap	$ 2,040	$ 7,576	$ 7,390	$ 22,386

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Year of interest rate swap maturity date, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc)

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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)

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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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-Publisher SEC

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

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- Definition

Interest rate stated in the contractual debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

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-Subparagraph (SX 210.5-02.22(a)(1))

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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.

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- Definition

Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings.

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-Publisher FASB

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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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- 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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Sum of the carrying values as of the balance sheet date of all long-term debt, which is debt initially having maturities due after one year from the balance sheet date or beyond the operating cycle, if longer, but excluding the portions thereof scheduled to be repaid within one year (current maturities) or the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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-Paragraph 1

-Subparagraph (SX 210.5-02.22)

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- Definition

Aggregate notional amount of all derivatives. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Glossary Notional Amount

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