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Segment Information (Schedule of Long-Lived Asset by Geographic Region) (Parenthetical) (Details)	9 Months Ended	12 Months Ended
	Sep. 29, 2024	Dec. 31, 2023
Maximum | APAC (excluding Singapore)
Revenues From External Customers And Long Lived Assets [Line Items]
Percentage of total long-lived assets owned	10.00%	10.00%

X

- Definition

Percentage of long-lived assets owned.

+ References

No definition available.

+ Details

Name:	ntgr_PercentageOfLongLivedAssetsOwned
Namespace Prefix:	ntgr_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: