Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified				3 Months Ended		6 Months Ended			6 Months Ended		12 Months Ended	6 Months Ended		12 Months Ended	6 Months Ended		12 Months Ended	6 Months Ended		12 Months Ended
	Jul. 01, 2012	Dec. 25, 2011	Jun. 26, 2011	Jul. 01, 2012 Interest Rate Swap 6.125% Note Due 2014 [Member]	Jun. 26, 2011 Interest Rate Swap 6.125% Note Due 2014 [Member]	Jul. 01, 2012 Interest Rate Swap 6.125% Note Due 2014 [Member]	Jun. 26, 2011 Interest Rate Swap 6.125% Note Due 2014 [Member]	Dec. 25, 2011 Interest Rate Swap 6.125% Note Due 2014 [Member]	Jul. 01, 2012 Notes 6.125% Due 2014 [Member]	Jun. 26, 2011 Notes 6.125% Due 2014 [Member]	Dec. 25, 2011 Notes 6.125% Due 2014 [Member]	Jul. 01, 2012 Notes 6.30% Due 2017 [Member]	Jun. 26, 2011 Notes 6.30% Due 2017 [Member]	Dec. 25, 2011 Notes 6.30% Due 2017 [Member]	Jul. 01, 2012 Debentures 6.60% Due 2028 [Member]	Jun. 26, 2011 Debentures 6.60% Due 2028 [Member]	Dec. 25, 2011 Debentures 6.60% Due 2028 [Member]	Jul. 01, 2012 Notes 6.35% Due 2040 [Member]	Jun. 26, 2011 Notes 6.35% Due 2040 [Member]	Dec. 25, 2011 Notes 6.35% Due 2040 [Member]
Debt Instrument [Line Items]
Carrying Cost	$ 1,399,557	$ 1,400,872	$ 1,403,031						$ 439,662	$ 443,136	$ 440,977	$ 350,000	$ 350,000	$ 350,000	$ 109,895	$ 109,895	$ 109,895	$ 500,000	$ 500,000	$ 500,000
Fair Value	1,565,323	1,524,266	1,508,370						460,020	469,625	462,868	400,015	399,420	400,400	123,038	115,675	120,148	582,250	523,650	540,850
Principal Amount	1,384,895	1,384,895	1,384,895						425,000	425,000	425,000	350,000	350,000	350,000	109,895	109,895	109,895	500,000	500,000	500,000
Maturity Date									2014	2014	2014	2017	2017	2017	2028	2028	2028	2040	2040	2040
Interest Rate									6.125%	6.125%	6.125%	6.30%	6.30%	6.30%	6.60%	6.60%	6.60%	6.35%	6.35%	6.35%
Fair value adjustment, interest rate swap				14,662	18,136	14,662	18,136	15,977	14,662	18,136	15,977
Derivative [Line Items]
Interest rate swap notional amount				400,000	400,000	400,000	400,000	400,000
Interest rate swap maturity date				2014	2014	2014	2014
Fair value, interest rate swap				14,662	18,136	14,662	18,136	15,977	14,662	18,136	15,977
Gain (loss) from interest rate swap				$ (1,385)	$ 6,336	$ (1,315)	$ 5,350