Segment Information (Schedule of Reportable Segments and Reconciliation of Segment Contribution Income to Income Before Income Taxes) (Details) - USD ($) $ in Thousands		3 Months Ended
		Apr. 01, 2018	Apr. 02, 2017
Segment Reporting Information [Line Items]
Total net revenue		$ 344,973	$ 323,657
Total segment contribution income		48,476	50,537
Corporate and unallocated costs		(22,603)	(18,201)
Amortization of intangibles	[1]	(2,461)	(4,382)
Stock-based compensation expense		(8,150)	(5,128)
Separation expense		(6,784)	0
Restructuring and other charges		9	(37)
Interest income		748	405
Other income (expense), net		(1,252)	335
Income before income taxes		7,983	23,529
Arlo
Segment Reporting Information [Line Items]
Total net revenue		96,209	60,712
Total segment contribution income		$ 4,360	$ 321
Segment contribution margin		4.50%	0.50%
Connected Home
Segment Reporting Information [Line Items]
Total net revenue		$ 177,781	$ 194,361
Total segment contribution income		$ 25,529	$ 31,712
Segment contribution margin		14.40%	16.30%
SMB
Segment Reporting Information [Line Items]
Total net revenue		$ 70,983	$ 68,584
Total segment contribution income		$ 18,587	$ 18,504
Segment contribution margin		26.20%	27.00%

[1] Amount excludes amortization expense related to patents within purchased intangibles in cost of revenue.