Restructuring and Other Charges (Summary of Activity Related to Accrued Restructuring and Other Charges ) (Parenthetical) (Details) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Restructuring Charges [Abstract]
Restructuring non-cash charges and adjustments, net	$ 0.1

Restructuring non-cash charges and adjustments, net.

No definition available.

Name:	ntgr_RestructuringNonCashChargesAndAdjustmentsNet
Namespace Prefix:	ntgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration