Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments - Effect of Derivative Instruments Recorded in Other Income (Expense) (Detail)

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Derivative Instruments - Effect of Derivative Instruments Recorded in Other Income (Expense) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 29, 2014
Mar. 30, 2013
Mar. 29, 2014
Mar. 30, 2013
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]        
Total derivative instruments $ 0 $ 68 $ 0 $ (738)
Commodity Contracts [Member] | Derivatives Not Designated as Hedging Instruments [Member]
        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]        
Total derivative instruments $ 0 $ 68 $ 0 $ (738)