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Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Jul. 27, 2018	Jul. 28, 2017
Disaggregation Of Revenue [Line Items]
Revenue recognized	$ 561	$ 528
Transaction price allocated to remaining performance obligations	$ 3,260
Minimum
Disaggregation Of Revenue [Line Items]
Deferred sales commissions amortization period	1 year
Maximum
Disaggregation Of Revenue [Line Items]
Deferred sales commissions amortization period	3 years

X

- Definition

Deferred sales commissions amortization period.

+ References

No definition available.

+ Details

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X

- Definition

Amount of revenue recognized that was previously reported as deferred or unearned revenue.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130556-203045

+ Details

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Period Type:	instant

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- Details

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