The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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Income Taxes (Schedule Of Income Taxes Calculated On Income Before Income Taxes And Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011	Dec. 25, 2010	Sep. 25, 2010	Jun. 26, 2010	Mar. 27, 2010	Dec. 31, 2011	Dec. 25, 2010	Dec. 26, 2009
Income Taxes [Abstract]
Income taxes at federal income tax rate									$ 63,047	$ 47,722	$ 38,399
State income taxes, net of federal income tax benefit									2,424	695	676
Meals and entertainment exclusion									972	691	870
Share-based payments									708	550	636
Other, net									37	108	(819)
Income taxes	$ 17,546	$ 18,640	$ 18,295	$ 12,707	$ 11,005	$ 13,315	$ 14,962	$ 10,484	$ 67,188	$ 49,766	$ 39,762
Federal income tax rate									35.00%