Segment Information (Schedule Of Total Segment Income To Consolidated Income Before Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 25, 2012	Mar. 27, 2011
Segment Information [Abstract]
Total Segment Income	$ 76,616	$ 72,102
Depreciation and amortization	(5,216)	(5,606)
Gains on sale/disposal of assets	37	1,624
Non-cash compensation expense	(4,290)	(3,008)
2012 recapitalization-related expenses	(252)
Income from operations	66,895	65,112
Interest income	154	80
Interest expense	(32,250)	(21,457)
Income before provision for income taxes	$ 34,799	$ 43,735