Balance Sheet Components (Schedule of Other Accrued Liabilities) (Parentheticals) (Details) - USD ($) $ in Millions	Jun. 29, 2025	Dec. 31, 2024
Balance Sheet Related Disclosures [Abstract]
Inventory expected to be received from future sales returns	$ 10.6	$ 15.1
Provisions to write down expected returned inventory to net realizable value	$ 7.4	$ 9.0

Provisions to write down expected returned inventory to net realizable value.

No definition available.

Name:	ntgr_ProvisionsToWriteDownExpectedReturnedInventoryToNetRealizableValue
Namespace Prefix:	ntgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant