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Income Taxes (Summary Of Valuation Allowances) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 25, 2010	Sep. 26, 2009
Income Taxes [Abstract]
Beginning Balance	$ 648,869,000	$ 657,000,000	$ 321,600,000
Net Change	(27,200,000)	(8,100,000)
Ending Balance	$ 621,719,000	$ 648,869,000	$ 321,600,000

The sum of the portions of deferred tax assets as of the balance sheet date for which, based on the weight of available evidence, it is more likely than not will not be realized through future reductions of tax-based income.

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