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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
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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)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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