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Revenue - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Oct. 26, 2018	Oct. 27, 2017
Disaggregation Of Revenue [Line Items]
Revenue recognized	$ 1,019	$ 1,017
Transaction price allocated to remaining performance obligations	$ 3,206
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

Name:	ntap_DeferredSalesCommissionsAmortizationPeriod
Namespace Prefix:	ntap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of contract with customer liability obligation as of the beginning of the period.

+ References

No definition available.

+ Details

Name:	ntap_RevenueRecognizedFromBeginningContractWithCustomerLiability
Namespace Prefix:	ntap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

X

- 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

Name:	us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: