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Statements of Cash Flows Additional Information - Supplemental Cash Flows and Non Cash Investing Activities (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 24, 2015
Apr. 25, 2014
Apr. 26, 2013
Non-cash Investing Activities:      
Reclassification of equity component of Convertible Notes $ 0us-gaap_DebtConversionConvertedInstrumentAmount1 $ 0us-gaap_DebtConversionConvertedInstrumentAmount1 $ 62.6us-gaap_DebtConversionConvertedInstrumentAmount1
Capital expenditures incurred but not paid 12.1us-gaap_CapitalExpendituresIncurredButNotYetPaid 18.0us-gaap_CapitalExpendituresIncurredButNotYetPaid 20.2us-gaap_CapitalExpendituresIncurredButNotYetPaid
Acquisition of software through long-term financing 12.3us-gaap_FairValueOfAssetsAcquired 11.4us-gaap_FairValueOfAssetsAcquired 0.8us-gaap_FairValueOfAssetsAcquired
Supplemental Cash Flow Information:      
Income taxes paid, net of refunds 97.4us-gaap_IncomeTaxesPaidNet 58.1us-gaap_IncomeTaxesPaidNet 46.7us-gaap_IncomeTaxesPaidNet
Interest paid $ 32.7us-gaap_InterestPaid $ 35.2us-gaap_InterestPaid $ 22.8us-gaap_InterestPaid