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Debt Obligations - Debt & Capital Leases (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended			0 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010	Dec. 26, 2010	Aug. 15, 2011 Notes Due 2015 Called 2011 [Member]	Sep. 25, 2011 Notes Due 2015 Called 2011 [Member]	Dec. 26, 2010 Notes Due 2015 Called 2011 [Member]	Sep. 25, 2011 Notes Due 2012 [Member]	Dec. 26, 2010 Notes Due 2012 [Member]	Sep. 25, 2011 Notes Due 2015 [Member]	Dec. 26, 2010 Notes Due 2015 [Member]	Sep. 25, 2011 Notes Due 2016 [Member]	Dec. 26, 2010 Notes Due 2016 [Member]	Sep. 25, 2011 Option To Repurchase Headquarters Building 2019 [Member]	Dec. 26, 2010 Option To Repurchase Headquarters Building 2019 [Member]
Total debt & capital lease obligations
Long term debt							$ 0	$ 227,680	$ 74,867	$ 74,771	$ 249,883	$ 249,860	$ 220,612	$ 220,102	$ 219,952	$ 217,306
Total debt	765,314		765,314		989,719
Capital lease obligations	6,707		6,707		6,724
Total debt and capital lease obligations	772,021		772,021		996,443
Interest rate on debt						14.053%			4.61%		5.00%		6.625%
Principal amount of debt						250,000
Prepayment amount for redemption of 14.053% Notes						280,000
Accrued and unpaid interest for prepayment of 14.053% Notes						3,000
Make-whole premium amount for redemption of 14.053% Notes						27,000
Premium on debt redemption	46,381	0	46,381	0
Fair value of long-term debt	$ 863,000		$ 863,000		$ 1,100,000