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. 25, 2013	Oct. 26, 2012	Oct. 25, 2013	Oct. 26, 2012
Segment Reporting Information [Line Items]
Net revenues	$ 1,549.9	$ 1,541.2	$ 3,066.1	$ 2,985.8
Americas (United States, Canada And Latin America)
Segment Reporting Information [Line Items]
Net revenues	899.2	897.3	1,757.7	1,698.4
Europe, Middle East And Africa
Segment Reporting Information [Line Items]
Net revenues	445.0	437.7	893.0	877.0
Asia Pacific
Segment Reporting Information [Line Items]
Net revenues	$ 205.7	$ 206.2	$ 415.4	$ 410.4