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Balance Sheet Details - Additional Information (Detail) - USD ($) $ in Millions	Oct. 26, 2018	Jan. 26, 2018	Oct. 27, 2017	Sep. 08, 2017
Property Plant And Equipment [Line Items]
Sale price of assets				$ 306
Scenario, Forecast
Property Plant And Equipment [Line Items]
Sale of assets payments to be received	$ 96	$ 210
Other Current Assets
Property Plant And Equipment [Line Items]
Land and buildings held for sale book value			$ 118

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

Sale price of assets.

+ References

No definition available.

+ Details

Name:	ntap_SalePriceOfAssets
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://www.xbrl.org/2003/role/presentationRef
-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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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=us-gaap_OtherCurrentAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: