Fair Value Measurements Fair Value Measurements (Details) (USD $)	12 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 26, 2010	Sep. 30, 2012 Fair Value, Inputs, Level 1 [Member]	Sep. 25, 2011 Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Inputs, Level 2 [Member]	Sep. 25, 2011 Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Inputs, Level 3 [Member]	Sep. 25, 2011 Fair Value, Inputs, Level 3 [Member]	Sep. 26, 2010 Fair Value, Inputs, Level 3 [Member]	Feb. 18, 2009 Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Estimate Not Practicable, Investments	$ 8,640,000
Obligations, Fair Value Disclosure				0	0	0	0	300,000	300,000	2,300,000	2,300,000
Tangible Asset Impairment Charges	$ 1,388,000	$ 700,000	$ 899,000