Long-Term Debt and Capital Lease Obligations (Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified											12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Dec. 31, 2011 2.25% Senior convertible debentures	Dec. 25, 2010 2.25% Senior convertible debentures	Jun. 20, 2006 2.25% Senior convertible debentures	Jun. 12, 2006 2.25% Senior convertible debentures	Dec. 31, 2011 Term loan facilities	Dec. 25, 2010 Term loan facilities	Dec. 31, 2011 Revolving credit facility	Dec. 25, 2010 Revolving credit facility	Dec. 31, 2011 Other long-term debt, represents secured and unsecured promissory notes, interest rates ranging from 0% to 0.5%, 0% to 0.5% and 0% to 0.5% at December 31, 2011, December 25, 2010 and December 26, 2009, respectively, maturing between 2012 and 2013	Dec. 25, 2010 Other long-term debt, represents secured and unsecured promissory notes, interest rates ranging from 0% to 0.5%, 0% to 0.5% and 0% to 0.5% at December 31, 2011, December 25, 2010 and December 26, 2009, respectively, maturing between 2012 and 2013	Dec. 26, 2009 Other long-term debt, represents secured and unsecured promissory notes, interest rates ranging from 0% to 0.5%, 0% to 0.5% and 0% to 0.5% at December 31, 2011, December 25, 2010 and December 26, 2009, respectively, maturing between 2012 and 2013
Debt Instrument
Principal	$ 739,435		$ 349,995	$ 349,995
Unamortized debt discount			(21,533)	(35,583)	(88,492)
Total debt	717,902	700,752	328,462	314,412			356,322	386,213	33,000	0	118	127
Less: current portion of long-term debt	(14,732)	(30,535)
Long-term debt	$ 703,170	$ 670,217
Interest rate on debt (as a percent)			2.25%	2.25%	2.25%	2.25%
Interest rate on debt, minimum (as a percent)											0.00%	0.00%	0.00%
Interest rate on debt, maximum (as a percent)											0.50%	0.50%	0.50%