Derivatives (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		9 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 29, 2012	Jun. 24, 2011	Jun. 29, 2012	Jun. 24, 2011	Sep. 24, 2010 Interest Rate Swap [Member] Derivatives not designated as hedging instruments [Member]	Jun. 24, 2011 Foreign Currency Gain Loss [Member] Derivatives not designated as hedging instruments [Member]	Jun. 24, 2011 Foreign Currency Gain Loss [Member] Derivatives not designated as hedging instruments [Member]	Jun. 29, 2012 Commodity [Member] Derivatives not designated as hedging instruments [Member]	Jun. 29, 2012 Commodity [Member] Derivatives not designated as hedging instruments [Member]
Effect of derivative instruments on statements of operations
Cost of sales	$ 84,354	$ 73,000	$ 156,374	$ 134,148		$ (67)	$ 243
Operating expenses	21,954	18,551	42,945	35,530				(18)	(17)
Gain on fluctuation of interest rate swap				$ 81	$ 81