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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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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