Segment Geographic and Significant Customer Information - Schedule of Revenues by Geographic Region (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jul. 25, 2014	Jul. 26, 2013
Segment Reporting Information [Line Items]
Net revenues	$ 1,489.2	$ 1,516.2
Americas (United States, Canada And Latin America)
Segment Reporting Information [Line Items]
Net revenues	831.2	858.5
Europe, Middle East And Africa
Segment Reporting Information [Line Items]
Net revenues	444.9	448.0
Asia Pacific
Segment Reporting Information [Line Items]
Net revenues	$ 213.1	$ 209.7

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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=26872669&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_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration