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v3.20.2

Segment Information (Schedule of Long-Lived Asset by Geographic Region) (Parenthetical) (Details) | 6 Months Ended
--- | ---
Jun. 28, 2020
Maximum | APAC (excluding Singapore and China) |
Revenues From External Customers And Long Lived Assets [Line Items] |
Percentage of total long-lived assets owned | 10.00%

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

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

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

X
- Details
Name: | srt_StatementGeographicalAxis=ntgr_AsiaPacificExcludingSingaporeAndChinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |