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Stockholders' Equity - Schedule of Employee Stock Purchase Plan (ESPP) (Detail) - USD ($) shares in Millions, $ in Millions	9 Months Ended
	Jan. 25, 2019	Jan. 26, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under the ESPP	3	4
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds from issuance of shares	$ 96	$ 85

X

- Definition

Amount of cash inflow from issuance of shares under share-based compensation arrangement, excluding stock option exercises.

+ References

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901

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Number of shares issued during the period as a result of an employee stock purchase plan.

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