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Net Fair Value of Commodity Price Risk (Detail) (USD $) In Millions, unless otherwise specified	Apr. 25, 2015
Derivatives, Fair Value [Line Items]
Liabilities	$ (20.9)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue
Net Fair Value	(20.9)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet
Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(17.2)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherCurrentLiabilitiesMember
Other LongTerm Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(3.7)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember
Level 1
Derivatives, Fair Value [Line Items]
Liabilities	(16.9)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Net Fair Value	(16.9)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Level 1 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(14.9)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
Level 2
Derivatives, Fair Value [Line Items]
Liabilities	(4.0)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Net Fair Value	(4.0)us-gaap_PriceRiskCashFlowHedgeDerivativeAtFairValueNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Level 2 | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Liabilities	(2.3)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	$ (1.7)us-gaap_PriceRiskCashFlowHedgeLiabilityAtFairValue / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherNoncurrentLiabilitiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624163-113959

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