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Derivatives and Hedging Activities - Schedule of Derivative Instruments Not Designated as Cash Flow Hedges (Detail) (Foreign Exchange Forward Contracts, USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Jan. 23, 2015 | Jan. 24, 2014 | Jan. 23, 2015 | Jan. 24, 2014
Foreign Exchange Forward Contracts |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Foreign exchange contracts | $ 11.0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | $ 1.0 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | $ 9.4 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember | $ 1.8 us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as 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 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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