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Financial Instruments and Risk Management, Offsetting Derivative Assets (Details) (USD $) In Thousands, unless otherwise specified | Dec. 27, 2014 | Sep. 27, 2014
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Asset Derivatives [Abstracts] |  |
Gross amounts | $ 22,554 us-gaap_DerivativeFairValueOfDerivativeAsset | $ 11,672 us-gaap_DerivativeFairValueOfDerivativeAsset
Effects of netting | (4,627)us-gaap_DerivativeAssetFairValueGrossLiability | (7,686)us-gaap_DerivativeAssetFairValueGrossLiability
Net amounts presented in the balance sheet | 17,927 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral | 3,986 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral
Commodity-Related Derivatives [Member] |  |
Asset Derivatives [Abstracts] |  |
Gross amounts | 20,694 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember | 9,533 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember
Effects of netting | (2,767)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember | (5,547)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember
Net amounts presented in the balance sheet | 17,927 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember | 3,986 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember
Interest Rate Swaps [Member] |  |
Asset Derivatives [Abstracts] |  |
Gross amounts | 1,860 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 2,139 us-gaap_DerivativeFairValueOfDerivativeAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Effects of netting | (1,860)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (2,139)us-gaap_DerivativeAssetFairValueGrossLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Net amounts presented in the balance sheet | $ 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 0 us-gaap_DerivativeFairValueOfDerivativeAssetAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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- Definition Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226000-175313 + Details
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