Restructuring and Other Charges - (Narrative) (Details)	9 Months Ended
Oct. 03, 2021
Restructuring Charges [Abstract]
Remaining liabilities of restructuring and related activities, paid off date description	fourth fiscal quarter of 2021.

Remaining liabilities of restructuring and related activities paid off date description.

No definition available.

Name:	ntgr_RemainingLiabilitiesOfRestructuringAndRelatedActivitiesPaidOffDateDescription
Namespace Prefix:	ntgr_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration