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Restructuring Charges - Additional Information (Detail) | Apr. 27, 2018
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May 2015 Restructuring |
Restructuring Cost and Reserve [Line Items] |
Reduction of global work force | 3.00%
March 2016 Restructuring |
Restructuring Cost and Reserve [Line Items] |
Reduction of global work force | 11.00%
November 2016 Restructuring |
Restructuring Cost and Reserve [Line Items] |
Reduction of global work force | 6.00%

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- Definition Percentage of the total number of positions eliminated as of the balance sheet date since inception of the restructuring plan(s). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- 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_RestructuringCostAndReserveLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RestructuringPlanAxis=ntap_MayTwentyFifteenRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestructuringPlanAxis=ntap_MarchTwentySixteenRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RestructuringPlanAxis=ntap_NovemberTwentySixteenRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |