Stockholders' Equity - Number and Value of Shares Netted for Employee Taxes (Detail) - Restricted Stock Units - USD ($) shares in Millions, $ in Millions	12 Months Ended
Apr. 30, 2021	Apr. 24, 2020	Apr. 26, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld for taxes	1	1	1
Fair value of shares withheld	$ 42	$ 79	$ 96

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.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration