Balance Sheet Details - Depreciation and Amortization Expense (Detail) - USD ($) $ in Millions	12 Months Ended
Apr. 28, 2017	Apr. 29, 2016	Apr. 24, 2015
Depreciation, Depletion and Amortization [Abstract]
Depreciation and amortization expense	$ 178	$ 212	$ 243

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Name:	us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration