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. 26, 2012	Oct. 28, 2011	Oct. 26, 2012	Oct. 28, 2011
Segment Reporting Information [Line Items]
Net revenues	$ 1,541.2	$ 1,507.0	$ 2,985.8	$ 2,965.2
Americas (United States, Canada And Latin America)
Segment Reporting Information [Line Items]
Net revenues	897.3	897.1	1,698.4	1,710.5
Europe, Middle East And Africa
Segment Reporting Information [Line Items]
Net revenues	437.7	428.9	877.0	885.6
Asia Pacific And Japan
Segment Reporting Information [Line Items]
Net revenues	$ 206.2	$ 181.0	$ 410.4	$ 369.1

Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration