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Employee Benefits and Deferred Compensation - Schedule of Amounts Recognized in Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 24, 2015
Apr. 25, 2014
Compensation And Retirement Disclosure [Abstract]    
Other long-term liabilities $ 40.5us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent $ 27.0us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
AOCI $ (12.4)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax $ (4.8)us-gaap_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax