Discontinued Operations (Income (Loss) From Discontinued Operations, Net Of Tax) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Apr. 01, 2018
Operating expenses:
Income from discontinued operations, net of tax	$ 0	$ 4,572
Arlo | Discontinued Operations, Disposed of by Spin-off
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net revenues		99,772
Cost of revenue		71,586
Gross profit		28,186
Operating expenses:
General and administrative		876
Total operating expenses		21,201
Income from operations of discontinued operations		6,985
Other income (expense), net		66
Income from discontinued operations before income taxes		7,051
Provision for income taxes		2,479
Income from discontinued operations, net of tax		4,572
Research and development | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		7,757
Sales and marketing | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		5,784
Separation expense | Arlo | Discontinued Operations, Disposed of by Spin-off
Operating expenses:
Total operating expenses		$ 6,784