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Balance Sheet Components (Schedule of Other Accrued Liabilities) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 03, 2021 | Dec. 31, 2020
Balance Sheet Related Disclosures [Abstract] |  |  |
Current operating lease liabilities |  | $ 8,887 | $ 9,149
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] |  | ntgr:OperatingLeaseLiabilityCurrentMember | ntgr:OperatingLeaseLiabilityCurrentMember
Sales and marketing |  | $ 107,110 | $ 83,561
Warranty obligations |  | 6,863 | 9,240
Sales returns | [1] | 50,771 | 66,972
Freight and duty |  | 15,600 | 14,885
Other |  | 40,945 | 34,568
Total |  | $ 230,176 | $ 218,375
[1] | Inventory expected to be received from future sales returns amounted to $24.8 million and $32.6 million as of October 3, 2021 and December 31, 2020, respectively. Provisions to write down expected returned inventory to net realizable value amounted to $15.3 million and $18.0 million as of October 3, 2021 and December 31, 2020, respectively.

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