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. 24, 2014	Jan. 25, 2013	Jan. 24, 2014	Jan. 25, 2013
Segment Reporting Information [Line Items]
Net revenues	$ 1,610.0	$ 1,630.1	$ 4,676.1	$ 4,615.9
Americas (United States, Canada And Latin America)
Segment Reporting Information [Line Items]
Net revenues	838.7	882.8	2,596.4	2,581.2
Europe, Middle East And Africa
Segment Reporting Information [Line Items]
Net revenues	546.9	528.6	1,439.9	1,405.6
Asia Pacific
Segment Reporting Information [Line Items]
Net revenues	$ 224.4	$ 218.7	$ 639.8	$ 629.1