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Segment Geographic and Significant Customer Information - Schedule of Revenues by Geographic Region (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Apr. 24, 2015
Apr. 25, 2014
Apr. 26, 2013
Segment Reporting Information [Line Items]      
Net revenues $ 6,122.7us-gaap_SalesRevenueNet $ 6,325.1us-gaap_SalesRevenueNet $ 6,332.4us-gaap_SalesRevenueNet
United States, Canada And Latin America (Americas)      
Segment Reporting Information [Line Items]      
Net revenues 3,446.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember		 3,513.3us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember		 3,552.5us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
Europe, Middle East And Africa (EMEA)      
Segment Reporting Information [Line Items]      
Net revenues 1,857.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember		 1,954.6us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember		 1,928.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Asia Pacific (APAC)      
Segment Reporting Information [Line Items]      
Net revenues $ 818.5us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 $ 857.2us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 $ 851.1us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember