Derivative Instruments - Summary of Derivative Instruments Not Designated as Hedging Instruments Statements of Financial Performance (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 24, 2011
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Total derivative instruments	$ (958)	$ 111	$ (9)
Commodity contracts [Member] | Derivatives Not Designated as Hedging Instrument [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Total derivative instruments	$ (958)	$ 111	$ (9)