Discontinued Operations (Income (Loss) From Discontinued Operations, Net Of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Operating expenses:
Loss from discontinued operations, net of tax	$ 0	$ (7,160)	$ 0	$ (8,351)
Arlo | Discontinued Operations, Disposed of by Spin-off
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net revenue		131,175		342,491
Cost of revenue		101,427		255,666
Gross profit		29,748		86,825
Operating expenses:
General and administrative		6,905		9,859
Total operating expenses		39,988		93,019
Loss from operations of discontinued operations		(10,240)		(6,194)
Interest Income		503		503
Other Expense		(126)
Other income (expense), net				213
Loss from discontinued operations before income taxes		(9,863)		(5,478)
Provision (benefit) for income taxes		(2,703)		2,873
Loss from discontinued operations, net of tax		(7,160)		(8,351)
Sales and marketing | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		11,592		25,148
Separation expense | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		6,675		25,443
Research and development | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		$ 14,816		$ 32,569