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Financial Instruments and Risk Management, Offsetting Derivative Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 27, 2014 | Sep. 27, 2014
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Liability Derivatives [Abstracts] |  |
Gross amounts | $ 12,343 us-gaap_DerivativeFairValueOfDerivativeLiability | $ 10,806 us-gaap_DerivativeFairValueOfDerivativeLiability
Effects of netting | (4,627)us-gaap_DerivativeLiabilityFairValueGrossAsset | (7,686)us-gaap_DerivativeLiabilityFairValueGrossAsset
Net amounts presented in the balance sheet | 7,716 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral | 3,120 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Cash collateral | 0 us-gaap_DerivativeCollateralRightToReclaimCash | 0 us-gaap_DerivativeCollateralRightToReclaimCash
Commodity-Related Derivatives [Member] |  |
Liability Derivatives [Abstracts] |  |
Gross amounts | 9,073 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember | 7,127 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember
Effects of netting | (2,767)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember | (5,547)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember
Net amounts presented in the balance sheet | 6,306 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember | 1,580 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityMember
Interest Rate Swaps [Member] |  |
Liability Derivatives [Abstracts] |  |
Gross amounts | 3,270 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 3,679 us-gaap_DerivativeFairValueOfDerivativeLiability / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Effects of netting | (1,860)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | (2,139)us-gaap_DerivativeLiabilityFairValueGrossAsset / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Net amounts presented in the balance sheet | $ 1,410 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | $ 1,540 us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or 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 liabilities elected not to be offset. Excludes liabilities 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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