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		6 Months Ended
	Jun. 24, 2012	Jun. 26, 2011	Jun. 24, 2012	Jun. 26, 2011
Income Tax (Benefit) Expense		$ 1,808		$ 433
Operating Income	(85,485)	13,551	(105,126)	4,520
As Previously Reported [Member]
Income Tax (Benefit) Expense		1,521		(315)
Operating Income		12,610		2,029
Canada Adjustments [Member]
Income Tax (Benefit) Expense		108		315
Operating Income		430		1,253
As Revised For Revision Adjustments [Member]
Income Tax (Benefit) Expense		1,629		0
Operating Income		13,040		3,282
Discontinued Operations Adjustments [Member]
Income Tax (Benefit) Expense		179		433
Operating Income		$ 511		$ 1,238