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Segment Geographic and Significant Customer Information - Additional Information (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 25, 2019 USD ($) Segment	Jan. 26, 2018 USD ($)	Jan. 25, 2019 USD ($) Segment	Jan. 26, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of industry segment | Segment	1		1
Net revenues	$ 1,563	$ 1,539	$ 4,554	$ 4,275
U.S.
Segment Reporting Information [Line Items]
Net revenues	$ 744	$ 731	$ 2,294	$ 2,092

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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