Segment Information (Schedule of Reportable Segments and Reconciliation of Segment Contribution Income to Income Before Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		7 Months Ended
	Jul. 01, 2018		Jul. 02, 2017		Jul. 01, 2018	Jul. 02, 2017	Jul. 01, 2018
Segment Reporting Information [Line Items]
Total net revenue	$ 366,820		$ 330,723		$ 711,793	$ 654,380
Total segment contribution income	48,632		45,048		97,108	95,585
Corporate and unallocated costs	(26,946)		(17,033)		(49,549)	(35,234)
Amortization of intangibles	(2,346)	[1]	(3,146)	[1]	(4,807)	(7,528)
Stock-based compensation expense	(8,970)		(5,701)		(17,120)	(10,829)
Separation expense	(11,984)		0		(18,768)	0	$ (20,200)
Restructuring and other charges	(1,376)		(22)		(1,367)	(59)
Litigation reserves, net	(5)		(53)		(5)	(53)
Interest income	1,072		482		1,820	887
Other income (expense), net	1,061		383		(191)	718
Income (loss) before income taxes	(862)		19,958		7,121	43,487
Arlo
Segment Reporting Information [Line Items]
Total net revenue	104,813		78,732		201,022	139,444
Total segment contribution income	$ (42)		$ 3,172		$ 4,318	$ 3,493
Segment contribution margin	0.00%		4.00%		2.10%	2.50%
Connected Home
Segment Reporting Information [Line Items]
Total net revenue	$ 191,164		$ 185,905		$ 368,945	$ 380,266
Total segment contribution income	$ 30,331		$ 25,124		$ 55,860	$ 56,836
Segment contribution margin	15.90%		13.50%		15.10%	14.90%
SMB
Segment Reporting Information [Line Items]
Total net revenue	$ 70,843		$ 66,086		$ 141,826	$ 134,670
Total segment contribution income	$ 18,343		$ 16,752		$ 36,930	$ 35,256
Segment contribution margin	25.90%		25.30%		26.00%	26.20%

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