Long-Term Debt (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010
Debt Instrument [Line Items]
Long-term debt, carrying cost	$ 1,396,421	$ 1,400,872
Long-term debt, fair value	1,600,212	1,524,266
Long-term debt, principal amount	1,384,895	1,384,895
Aggregate Amount of Long-Term Debt Maturing in Next 5 Years	775,000
Interest Rate Swap 6.125% Note Due 2014 [Member]
Derivative [Line Items]
Total notional amount		400,000
Gain (loss) on interest rate swaps	(3,095)	3,191	15,511
Derivative asset, fair value		15,977
Maturity date		Dec. 31, 2014
Notes 6.35% Due 2040 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying cost	500,000	500,000
Long-term debt, fair value	615,650	540,850
Interest rate on long-term debt (in hundredths)	6.35%	6.35%
Maturity date on long-term debt	Dec. 31, 2040	Dec. 31, 2040
Long-term debt, principal amount	500,000	500,000
Notes 6.125% Due 2014 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying cost	436,526	440,977
Long-term debt, fair value	455,175	462,868
Interest rate on long-term debt (in hundredths)	6.125%	6.125%
Maturity date on long-term debt	Dec. 31, 2014	Dec. 31, 2014
Long-term debt, principal amount	425,000	425,000
Adjustments included in carrying costs related to interest rate swaps	11,526	15,977
Range of interest rate adjustment dependent on the degree of decrease of the Company's credit rating, minimum (in hundredths)	0.25%	0.25%
Range of interest rate adjustment dependent on the degree of decrease of the Company's credit rating, maximum (in hundredths)	2.00%	2.00%
Notes 6.30% Due 2017 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying cost	350,000	350,000
Long-term debt, fair value	399,700	400,400
Interest rate on long-term debt (in hundredths)	6.30%	6.30%
Maturity date on long-term debt	Dec. 31, 2017	Dec. 31, 2017
Long-term debt, principal amount	350,000	350,000
Range of interest rate adjustment dependent on the degree of decrease of the Company's credit rating, minimum (in hundredths)	0.25%	0.25%
Range of interest rate adjustment dependent on the degree of decrease of the Company's credit rating, maximum (in hundredths)	2.00%	2.00%
Debentures 6.60% Due 2028 [Member]
Debt Instrument [Line Items]
Long-term debt, carrying cost	109,895	109,895
Long-term debt, fair value	129,687	120,148
Interest rate on long-term debt (in hundredths)	6.60%	6.60%
Maturity date on long-term debt	Dec. 31, 2028	Dec. 31, 2028
Long-term debt, principal amount	$ 109,895	$ 109,895