Segment Geographic and Significant Customer Information - Schedule of Revenues by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended
Jul. 31, 2015	Jul. 25, 2014
Segment Reporting Information [Line Items]
Net revenues	$ 1,335	$ 1,489
United States, Canada And Latin America (Americas)
Segment Reporting Information [Line Items]
Net revenues	745	831
Europe, Middle East And Africa (EMEA)
Segment Reporting Information [Line Items]
Net revenues	415	445
Asia Pacific (APAC)
Segment Reporting Information [Line Items]
Net revenues	$ 175	$ 213

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

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