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Segment Geographic and Significant Customer Information - Schedule of Revenues by Geographic Region (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Jan. 23, 2015
Jan. 24, 2014
Jan. 23, 2015
Jan. 24, 2014
Segment Reporting Information [Line Items]        
Net revenues $ 1,551.3us-gaap_SalesRevenueNet $ 1,610.0us-gaap_SalesRevenueNet $ 4,583.0us-gaap_SalesRevenueNet $ 4,676.1us-gaap_SalesRevenueNet
Americas (United States, Canada And Latin America)        
Segment Reporting Information [Line Items]        
Net revenues 836.9us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
838.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
2,574.2us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
2,596.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AmericasMember
Europe, Middle East And Africa        
Segment Reporting Information [Line Items]        
Net revenues 509.2us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
546.9us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
1,391.7us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
1,439.9us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EMEAMember
Asia Pacific        
Segment Reporting Information [Line Items]        
Net revenues $ 205.2us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
$ 224.4us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
$ 617.1us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
$ 639.8us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember