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Employee Benefit Plans (Schedule of RSU Activity) (Details) - $ / shares	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 29, 2019	Sep. 29, 2019	Dec. 31, 2018
RSUs
Number of shares
Beginning balance (in shares)		3,141,000
Granted (in shares)		6,293,000
Vested (in shares)		(1,033,000)
Forfeited / Cancelled (in shares)		(368,000)
Ending balance (in shares)	8,033,000	8,033,000	3,141,000
Weighted Average Grant Date Fair Value Per Share
Beginning Balance (in dollars per share)		$ 12.22
Granted (in dollars per share)		4.83
Vested (in dollars per share)		11.30
Forfeited / Cancelled (in dollars per share)		8.55
Ending Balance (in dollars per share)	$ 6.71	$ 6.71	$ 12.22
MPSUs
Weighted Average Grant Date Fair Value Per Share
Positive movement of benchmark (multiplier)	3.3	3.3
Negative movement of benchmark (multiplier)	2.5	2.5
Positive movement of benchmark (as a percentage)	3.30%	3.30%
Negative movement of benchmark (as a percentage)	2.50%	2.50%
Movement of benchmark, increment (as a percentage)	1.00%	1.00%
Threshold (as a percentage)	30.00%	30.00%
NETGEAR | RSUs
Number of shares
Beginning balance (in shares)		522,000
Vested (in shares)		(155,000)
Forfeited / Cancelled (in shares)		(40,000)
Ending balance (in shares)	327,000	327,000	522,000
Weighted Average Grant Date Fair Value Per Share
Beginning Balance (in dollars per share)		$ 34.89
Vested (in dollars per share)		32.44
Forfeited / Cancelled (in dollars per share)		36.47
Ending Balance (in dollars per share)	$ 35.85	$ 35.85	$ 34.89
2018 Plan
Weighted Average Grant Date Fair Value Per Share
Granted (in shares)			2,800,000
2018 Plan | RSUs
Weighted Average Grant Date Fair Value Per Share
Granted (in shares)	800,000
Tranche One | RSUs
Weighted Average Grant Date Fair Value Per Share
Stock awards, annual vesting installments (as a percentage)		33.33%
Tranche One | PSUs
Weighted Average Grant Date Fair Value Per Share
Stock awards, annual vesting installments (as a percentage)		33.33%
Tranche Two | RSUs
Weighted Average Grant Date Fair Value Per Share
Stock awards, annual vesting installments (as a percentage)		33.33%
Tranche Two | PSUs
Weighted Average Grant Date Fair Value Per Share
Stock awards, annual vesting installments (as a percentage)		33.33%
Tranche Three | RSUs
Weighted Average Grant Date Fair Value Per Share
Stock awards, annual vesting installments (as a percentage)		33.33%
Tranche Three | PSUs
Weighted Average Grant Date Fair Value Per Share
Stock awards, annual vesting installments (as a percentage)		33.33%
Maximum | MPSUs
Weighted Average Grant Date Fair Value Per Share
Threshold (as a percentage)	200.00%	200.00%

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