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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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Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for the marketing, trade and selling of the entity's goods and services. Marketing costs would include expenditures for planning and executing the conception, pricing, promotion, and distribution of ideas, goods, and services; costs of public relations and corporate promotions; and obligations incurred and payable for sales discounts, rebates, price protection programs, etc. offered to customers and under government programs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of liability for consideration received or receivable from customer which is not included in transaction price, when consideration is expected to be refunded to customer, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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