Segment Information (Schedule of Reportable Segments and Reconciliation of Segment Contribution Income to Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended		10 Months Ended
	Sep. 30, 2018		Oct. 01, 2017		Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total net revenue	$ 400,586		$ 355,483		$ 1,112,379	$ 1,009,863
Total segment contribution income	60,978		52,359		158,086	147,944
Corporate and unallocated costs	(32,454)		(18,740)		(82,003)	(53,974)
Amortization of intangibles	(2,304)	[1]	(2,608)	[1]	(7,111)	(10,136)
Stock-based compensation expense	(9,554)		(5,583)		(26,674)	(16,412)
Separation expense	(7,054)		0		(25,822)	0	$ (27,300)
Restructuring and other charges	(1)		(19)		(1,368)	(78)
Litigation reserves, net	0		(15)		(5)	(68)
Interest income	1,490		501		3,310	1,388
Other income (expense), net	829		666		638	1,384
Income before income taxes	11,930		26,561		19,051	70,048
Arlo
Segment Reporting Information [Line Items]
Total net revenue	131,174		110,460		332,197	249,904
Total segment contribution income	$ 8,495		$ 15,230		$ 12,813	$ 18,723
Segment contribution margin	6.50%		13.80%		3.90%	7.50%
Connected Home
Segment Reporting Information [Line Items]
Total net revenue	$ 194,684		$ 183,099		$ 563,628	$ 563,365
Total segment contribution income	$ 31,283		$ 24,546		$ 87,143	$ 81,382
Segment contribution margin	16.10%		13.40%		15.50%	14.40%
SMB
Segment Reporting Information [Line Items]
Total net revenue	$ 74,728		$ 61,924		$ 216,554	$ 196,594
Total segment contribution income	$ 21,200		$ 12,583		$ 58,130	$ 47,839
Segment contribution margin	28.40%		20.30%		26.80%	24.30%

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