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Segment Information (Schedule of Long-Lived Asset by Geographic Region) (Parenthetical) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2021
Maximum | Asia Pacific Excluding Singapore |
Revenues From External Customers And Long Lived Assets [Line Items] |
Percentage of total long-lived assets owned | 10.00%

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- Definition Percentage of long-lived assets owned. + References No definition available. + Details
Name: | ntgr_PercentageOfLongLivedAssetsOwned
Namespace Prefix: | ntgr_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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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: | srt_StatementGeographicalAxis=ntgr_AsiaPacificExcludingSingaporeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |