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Restructuring and Other Charges - (Narrative) (Details) | 9 Months Ended
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Oct. 03, 2021
Restructuring Charges [Abstract] |
Remaining liabilities of restructuring and related activities, paid off date description | fourth fiscal quarter of 2021.

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- Definition Remaining liabilities of restructuring and related activities paid off date description. + References No definition available. + Details
Name: | ntgr_RemainingLiabilitiesOfRestructuringAndRelatedActivitiesPaidOffDateDescription
Namespace Prefix: | ntgr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RestructuringChargesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration