Summary Of Significant Accounting Polices (Effects Of Adjustment On Income Tax (Benefit) Expense And Operating (Loss) Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 23, 2012	Sep. 25, 2011	Sep. 23, 2012	Sep. 25, 2011
Income Tax Expense		$ 38,355		$ 38,788
Operating Loss	3,494	(7,170)	(101,632)	(2,650)
As Previously Reported [Member]
Income Tax Expense		38,588		38,273
Operating Loss		(8,603)		(6,574)
Canada Adjustments [Member]
Income Tax Expense		200		515
Operating Loss		797		2,050
As Revised For Revision Adjustments [Member]
Income Tax Expense		38,788		38,788
Operating Loss		(7,806)		(4,524)
Discontinued Operations Adjustments [Member]
Income Tax Expense		(433)		0
Operating Loss		$ 636		$ 1,874