Insurance Claims (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 01, 2011	Sep. 25, 2010	Oct. 01, 2011	Sep. 25, 2010	Dec. 25, 2010
Insurance Claim [Abstract]
Insurance proceeds received					$ 35,300,000
Insurance deductible					500,000
Insurance settlement	0	(12,000)	0	21,284,000	21,300,000
Insurance proceeds, received in installments					23,300,000
Insurance proceeds classified as investing activities			$ 0	$ 17,703,000	$ 17,700,000