Segment Geographic and Significant Customer Information - Schedule of Revenues by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013
Segment Reporting Information [Line Items]
Net revenues	$ 1,542.5	$ 1,549.9	$ 3,031.7	$ 3,066.1
Americas (United States, Canada And Latin America)
Segment Reporting Information [Line Items]
Net revenues	906.1	899.2	1,737.3	1,757.7
Europe, Middle East And Africa
Segment Reporting Information [Line Items]
Net revenues	437.6	445.0	882.5	893.0
Asia Pacific
Segment Reporting Information [Line Items]
Net revenues	$ 198.8	$ 205.7	$ 411.9	$ 415.4