Income Taxes (Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Income Taxes [Abstract]
Gross unrecognized tax benefits at beginning of year	$ 12,846	$ 14,884	$ 12,520
Increases in tax positions for prior years	997	1,161	2,502
Decreases in tax positions for prior years	(44)		(1,684)
Increases in tax positions for current year	808	1,229	1,442
Settlements	(443)	(928)
Acquisition reserves	2,029	240	2,631
Lapse in statute of limitations	(2,954)	(3,740)	(2,527)
Gross unrecognized tax benefits at end of year	$ 13,239	$ 12,846	$ 14,884