Discontinued Operations (Income (Loss) From Discontinued Operations, Net Of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Operating expenses:
Loss from discontinued operations, net of tax	$ 0	$ (5,763)	$ 0	$ (1,191)
Arlo | Discontinued Operations, Disposed of by Spin-off
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net revenue		111,544		211,316
Cost of revenue		82,653		154,239
Gross profit		28,891		57,077
Operating expenses:
General and administrative		2,078		2,954
Total operating expenses		31,830		53,031
Income (loss) from operations of discontinued operations		(2,939)		4,046
Other income (expense), net		273		339
Income (loss) from discontinued operations before income taxes		(2,666)		4,385
Provision for income taxes		3,097		5,576
Loss from discontinued operations, net of tax		(5,763)		(1,191)
Research and development | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		9,996		17,753
Sales and marketing | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		7,772		13,556
Separation expense | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		$ 11,984		$ 18,768