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Restructuring and Other Charges (Summary of Activity Related to Accrued Restructuring and Other Charges ) (Parenthetical) (Details) $ in Millions | 9 Months Ended
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Oct. 03, 2021 USD ($)
Restructuring Charges [Abstract] |
Restructuring non-cash charges and adjustments, net | $ 0.1

X
- Definition Restructuring non-cash charges and adjustments, net. + References No definition available. + Details
Name: | ntgr_RestructuringNonCashChargesAndAdjustmentsNet
Namespace Prefix: | ntgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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