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Restructuring Charges - Additional Information (Detail) | Jul. 31, 2020
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May 2020 Restructuring | Maximum |
Restructuring Cost and Reserve [Line Items] |
Reduction of global work force | 1.00%
May 2019 Restructuring |
Restructuring Cost and Reserve [Line Items] |
Reduction of global work force | 2.00%
April 2019 Restructuring |
Restructuring Cost and Reserve [Line Items] |
Reduction of global work force | 1.00%

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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
Name: | us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminatedInceptionToDatePercent
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_MayTwentyTwentyRestructuringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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