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Financial Instruments and Risk Management, Offsetting Derivative Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 28, 2015
Sep. 27, 2014
Liability Derivatives [Abstracts]    
Gross amounts $ 13,712us-gaap_DerivativeFairValueOfDerivativeLiability $ 10,806us-gaap_DerivativeFairValueOfDerivativeLiability
Effects of netting (9,127)us-gaap_DerivativeLiabilityFairValueGrossAsset (7,686)us-gaap_DerivativeLiabilityFairValueGrossAsset
Net amounts presented in the balance sheet 4,585us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral 3,120us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
Cash collateral 3,090us-gaap_DerivativeCollateralRightToReclaimCash 0us-gaap_DerivativeCollateralRightToReclaimCash
Commodity-Related Derivatives [Member]    
Liability Derivatives [Abstracts]    
Gross amounts 10,849us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityMember
7,127us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityMember
Effects of netting (7,830)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 3,019us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityMember
1,580us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityMember
Interest Rate Swaps [Member]    
Liability Derivatives [Abstracts]    
Gross amounts 2,863us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
3,679us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
Effects of netting (1,297)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 $ 1,566us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
$ 1,540us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountNotOffsetAgainstCollateral
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember