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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
 9 Months Ended
Jan. 23, 2015
Jan. 24, 2014
Non-cash Investing Activities:    
Capital expenditures incurred but not paid $ 12.2us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 25.7us-gaap_CapitalExpendituresIncurredButNotYetPaid
Acquisition of software through long-term financing 12.3us-gaap_FairValueOfAssetsAcquired 11.4us-gaap_FairValueOfAssetsAcquired
Supplemental Cash Flow Information:    
Income taxes paid, net of refunds 89.0us-gaap_IncomeTaxesPaidNet 39.5us-gaap_IncomeTaxesPaidNet
Interest paid $ 32.5us-gaap_InterestPaid $ 35.0us-gaap_InterestPaid