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Derivatives and Hedging Activities - Schedule of Notional Value of Outstanding Foreign Currency Forward Contracts (Detail) (United States of America, Dollars, USD $) In Millions, unless otherwise specified | Jan. 23, 2015 | Apr. 25, 2014
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Cash Flow Hedging | Long |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | $ 159.1 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = currency_USD / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_PositionAxis = us-gaap_LongMember | $ 122.6 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = currency_USD / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember / us-gaap_PositionAxis = us-gaap_LongMember
Non Designated | Long |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | 304.7 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = currency_USD / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember | 389.9 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = currency_USD / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_LongMember
Non Designated | Short |  |
Derivative [Line Items] |  |
Forward contracts, Notional Amount | $ 183.2 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = currency_USD / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember | $ 155.5 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = currency_USD / us-gaap_HedgingDesignationAxis = us-gaap_NondesignatedMember / us-gaap_PositionAxis = us-gaap_ShortMember

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration