Employee Benefit Plans (Schedule of RSU Activity) (Details) - RSUs - $ / shares shares in Thousands	2 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Sep. 30, 2018	Oct. 01, 2017
Weighted Average Grant Date Fair Value Per Share
Granted (in dollars per share)		$ 18.51		$ 53.23
Arlo
Number of shares
Beginning balance (in shares)	0
Granted (in shares)	60
Cancelled (in shares)	(5)
Ending balance (in shares)	55	55	55
Weighted Average Grant Date Fair Value Per Share
Beginning Balance (in dollars per share)	$ 0.00
Granted (in dollars per share)	18.51
Cancelled (in dollars per share)	22.71
Ending Balance (in dollars per share)	$ 18.17	$ 18.17	$ 18.17
NETGEAR
Number of shares
Beginning balance (in shares)			132
Granted (in shares)			335
Vested (in shares)			(93)
Cancelled (in shares)			(3)
Other (in shares)			166
Ending balance (in shares)	537	537	537
Weighted Average Grant Date Fair Value Per Share
Beginning Balance (in dollars per share)			$ 45.54
Granted (in dollars per share)			67.22
Vested (in dollars per share)			41.34
Cancelled (in dollars per share)			51.69
Other (in dollars per share)			43.71
Ending Balance (in dollars per share)	$ 59.09	$ 59.09	$ 59.09