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Supplemental Financial Information - Additional Information (Detail) - USD ($) $ in Millions	Jul. 26, 2019	Jul. 27, 2018	Apr. 27, 2018
Scenario, Forecast
Property Plant And Equipment [Line Items]
Sale of assets payments to be received	$ 96
Other Current Assets
Property Plant And Equipment [Line Items]
Land and buildings held for sale		$ 52	$ 52

X

- Definition

Sale of assets payments to be received.

+ References

No definition available.

+ Details

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Namespace Prefix:	ntap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

+ Details

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Period Type:	instant

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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X

- Details

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Namespace Prefix:
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- Details

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