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Balance Sheet Components (Schedule of Other Accrued Liabilities) (Parentheticals) (Details) - USD ($) $ in Millions | Jun. 28, 2020 | Dec. 31, 2019
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Balance Sheet Related Disclosures [Abstract] |  |
Inventory expected to be received from future sales returns | $ 24.9 | $ 26.8
Provisions to write down expected returned inventory to net realizable value | $ 14.4 | $ 14.9

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- Definition Inventory expected to be received from future sales returns. + References No definition available. + Details
Name: | ntgr_InventoryExpectedToBeReceivedFromFutureSalesReturns
Namespace Prefix: | ntgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Provisions to write down expected returned inventory to net realizable value. + References No definition available. + Details
Name: | ntgr_ProvisionsToWriteDownExpectedReturnedInventoryToNetRealizableValue
Namespace Prefix: | ntgr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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