Segment Geographic and Significant Customer Information - Schedule of Revenues by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 27, 2012		Jul. 29, 2011
Segment Reporting Information [Line Items]
Net revenues	$ 1,444.6		$ 1,458.2
Americas (United States, Canada And Latin America)
Segment Reporting Information [Line Items]
Net revenues	801.1	[1]	813.4	[1]
Europe, Middle East And Africa
Segment Reporting Information [Line Items]
Net revenues	439.3		456.7
Asia Pacific And Japan
Segment Reporting Information [Line Items]
Net revenues	$ 204.2		$ 188.1

[1] Americas revenues consist of Americas commercial and U.S. public sector markets. Sales to customers inside the United States comprised $711.4 million and $689.3 million of Americas net revenues during the three months ended July 27, 2012 and July 29, 2011, respectively.