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Balance Sheet Details - Property and Equipment Net (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 24, 2015
Apr. 25, 2014
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 2,223.1us-gaap_PropertyPlantAndEquipmentGross $ 2,192.5us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation and amortization (1,193.2)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,083.7)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 1,029.9us-gaap_PropertyPlantAndEquipmentNet 1,108.8us-gaap_PropertyPlantAndEquipmentNet
Land    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 265.5us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
265.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Buildings and improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 607.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
541.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Leasehold improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 106.6us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
102.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
Computer, production, engineering and other equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 753.7us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
753.8us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Computer software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 371.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
369.1us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Furniture and fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 85.4us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
86.4us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Construction-in-progress    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 33.0us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 72.9us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember