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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 29, 2018
Summary of weighted average fair value at the date of grant | The following summarizes the Company's weighted average fair value at the date of grant:
|  | Year Ended |
--- | --- | --- | ---
|  | December 29, 2018 |  | December 30, 2017 |  | December 31, 2016 |
Per grant of RSAs and RSUs |  | $ | 93.75 |  | $ | 72.85 |  | $ | 40.55 |
Per grant of PSUs and MSUs |  | $ | 97.53 |  | $ | 78.40 |  | $ | 32.23 |
Per grant of stock options |  | $ | — |  | $ | — |  | $ | 40.38 |
Summary of stock-based payment and stock option values | The following summarizes the Company's stock-based payment and stock option values (in thousands):
|  | Year Ended |
--- | --- | --- | ---
|  | December 29, 2018 |  | December 30, 2017 |  | December 31, 2016 |
Intrinsic value of stock options exercised |  | $ | 1,952 |  | $ | 2,174 |  | $ | 2,560 |
Intrinsic value of RSUs that vested |  | $ | 68,012 |  | $ | 53,093 |  | $ | 36,502 |
Grant date fair value of RSUs that vested |  | $ | 37,720 |  | $ | 32,449 |  | $ | 39,853 |
Intrinsic value of MSUs that vested |  | $ | 3,562 |  | $ | 687 |  | $ | — |
Grant date fair value of MSUs that vested |  | $ | 1,788 |  | $ | 633 |  | $ | — |
Schedule of stock-based compensation costs recognized in the Consolidated Statements of Income | The following table presents details of stock-based compensation costs recognized in the Consolidated Statements of Income (in thousands):
|  | Year Ended |
--- | --- | --- | ---
|  | December 29, 2018 |  | December 30, 2017 |  | December 31, 2016 |
Cost of revenues |  | $ | 1,238 |  | $ | 1,090 |  | $ | 1,070 |
Research and development |  |  | 23,867 |  |  | 21,771 |  |  | 19,573 |
Selling, general and administrative |  |  | 24,972 |  |  | 21,891 |  |  | 18,985 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 50,077 |  |  | 44,752 |  |  | 39,628 |
Income tax benefit |  |  | 8,890 |  |  | 11,073 |  |  | 8,496 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 41,187 |  | $ | 33,679 |  | $ | 31,132 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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Summary of shares reserved of common stock for future issuance | As of December 29, 2018, the Company had reserved shares of common stock for future issuance as follows (in thousands):
2009 Stock Incentive Plan |  |  | 2,343 |
2009 Employee Stock Purchase Plan |  |  | 985 |
​ | ​ | ​ | ​ | ​
Total shares reserved |  |  | 3,328 |
​ | ​ | ​ | ​ | ​
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Stock options |
Summary of assumptions used to estimate fair values for stock options |
|  | Year Ended |
--- | --- | --- | ---
Stock Options |  | December 29, 2018 |  | December 30, 2017 |  | December 31, 2016 |
Expected volatility |  |  | — |  |  | — |  |  | 32 | %
Risk-free interest rate % |  |  | — |  |  | — |  |  | 1.3 | %
Expected term (in years) |  |  | — |  |  | — |  |  | 5.4 |
Dividend yield |  |  | — |  |  | — |  |  | — |
Summary of stock-based compensation activity, options | A summary of stock-based compensation activity with respect to fiscal 2018 follows:
Stock Options |  | Shares (000s) |  | Weighted- Average Exercise Price |  | Weighted-Average Remaining Contractual Term (In Years) |  | Aggregate Intrinsic Value (000s) |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at December 30, 2017 |  |  | 170 |  | $ | 38.88 |  |  |  |  |  |  |
Exercised |  |  | (33 | ) | $ | 36.45 |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 29, 2018 |  |  | 137 |  | $ | 39.47 |  |  | 7.1 |  | $ | 5,327 |
Vested at December 29, 2018 and expected to vest |  |  | 83 |  | $ | 40.39 |  |  | 7.1 |  | $ | 3,154 |
Exercisable at December 29, 2018 |  |  | 50 |  | $ | 37.88 |  |  | 7.1 |  | $ | 2,031 |
MSUs |
Summary of assumptions used to estimate fair values for MSUs, Monte Carlo simulation | The fair values estimated from Monte Carlo simulation for MSUs were calculated using the following assumptions:
|  | Year Ended |
--- | --- | --- | ---
MSUs |  | December 29, 2018 |  | December 30, 2017 |  | December 31, 2016 |
Expected volatility |  |  | 29 | % |  | 31 | % |  | 30 | %
Risk-free interest rate % |  |  | 2.4 | % |  | 1.6 | % |  | 0.9 | %
Expected term (in years) |  |  | 2.9 |  |  | 2.9 |  |  | 2.9 |
Dividend yield |  |  | — |  |  | — |  |  | — |
RSAs and RSUs |
Summary of stock-based compensation activity, RSAs and RSUs |
RSAs and RSUs |  | Shares (000s) |  | Weighted- Average Purchase Price |  | Weighted-Average Remaining Vesting Term (In Years) |  | Aggregate Intrinsic Value (000s) |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at December 30, 2017 |  |  | 1,523 |  | $ | — |  |  |  |  |  |  |
Granted |  |  | 522 |  | $ | — |  |  |  |  |  |  |
Vested or issued |  |  | (730 | ) | $ | — |  |  |  |  |  |  |
Cancelled or forfeited |  |  | (97 | ) | $ | — |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 29, 2018 |  |  | 1,218 |  | $ | — |  |  | 0.86 |  | $ | 95,620 |
Outstanding at December 29, 2018 and expected to vest |  |  | 1,147 |  | $ | — |  |  | 0.86 |  | $ | 90,008 |
PSUs and MSUs |
Summary of stock-based compensation activity, PSUs and MSUs |
PSUs and MSUs |  | Shares (000s) |  | Weighted- Average Purchase Price |  | Weighted-Average Remaining Vesting Term (In Years) |  | Aggregate Intrinsic Value (000s) |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at December 30, 2017 |  |  | 259 |  | $ | — |  |  |  |  |  |  |
Granted |  |  | 81 |  | $ | — |  |  |  |  |  |  |
Earned or issued |  |  | (37 | ) | $ | — |  |  |  |  |  |  |
Cancelled or forfeited |  |  | (21 | ) | $ | — |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 29, 2018 |  |  | 282 |  | $ | — |  |  | 1.1 |  | $ | 22,164 |
Outstanding at December 29, 2018 and expected to vest |  |  | 249 |  | $ | — |  |  | 1.1 |  | $ | 19,615 |
2009 Employee Stock Purchase Plan |
Summary of assumptions used to estimate fair values for ESPP | The fair values estimated from the Black-Scholes option-pricing model for ESPP and stock options granted were calculated using the following assumptions:
|  | Year Ended |
--- | --- | --- | ---
Employee Stock Purchase Plan |  | December 29, 2018 |  | December 30, 2017 |  | December 31, 2016 |
Expected volatility |  |  | 30 | % |  | 28 | % |  | 30 | %
Risk-free interest rate % |  |  | 2.4 | % |  | 1.1 | % |  | 0.6 | %
Expected term (in months) |  |  | 9 |  |  | 8 |  |  | 15 |
Dividend yield |  |  | — |  |  | — |  |  | — |

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- Definition Disclosure of the number and weighted-average grant date fair value for performance share units and market based-stock units that were outstanding at the beginning and end of the year, and the number of market-based stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of equity instruments other than options, including, but not limited to: (a) expected term of similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References No definition available. + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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