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Net Fair Value of Commodity Price Risk (Detail) (USD $) In Millions, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013
Derivatives, Fair Value [Line Items]
Liabilities		$ (11.7)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue
Net Fair Value	(16.3)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet	(11.5)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet
Assets		0.2us-gaap_PriceRiskCashFlowHedgeAssetAtFairValue
Other Current Assets
Derivatives, Fair Value [Line Items]
Assets		0.2us-gaap_PriceRiskCashFlowHedgeAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(12.9)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember	(10.6)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember
Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(3.4)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember	(1.1)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Level 1
Derivatives, Fair Value [Line Items]
Liabilities		(11.1)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Net Fair Value	(12.9)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	(11.1)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(10.9)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	(10.4)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(2.0)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	(0.7)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 2
Derivatives, Fair Value [Line Items]
Liabilities		(0.6)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Net Fair Value	(3.4)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	(0.4)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Assets		0.2us-gaap_PriceRiskCashFlowHedgeAssetAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Other Current Assets
Derivatives, Fair Value [Line Items]
Assets		0.2us-gaap_PriceRiskCashFlowHedgeAssetAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentAssetsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(2.0)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	(0.2)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	$ (1.4)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	$ (0.4)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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Fair value as of the balance sheet date of all price risk derivative assets designated as cash flow hedging instruments.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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