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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of stock-based compensation activity | A summary of stock-based compensation activity with respect to fiscal 2016 follows:
Stock Options |  | Shares (000s) |  | Weighted- Average Exercise Price |  | Weighted-Average Remaining Contractual Term (In Years) |  | Aggregate Intrinsic Value (000s) |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at January 2, 2016 |  |  | 212 |  | $ | 34.64 |  |  |  |  |  |  |
Granted |  |  | 173 |  | $ | 40.39 |  |  |  |  |  |  |
Exercised |  |  | (137 | ) | $ | 33.08 |  |  |  |  |  |  |
Cancelled or expired |  |  | (20 | ) | $ | 57.26 |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2016 |  |  | 228 |  | $ | 37.95 |  |  | 7.14 |  | $ | 6,165 |
Vested at December 31, 2016 and expected to vest |  |  | 209 |  | $ | 37.74 |  |  | 6.97 |  | $ | 5,708 |
Exercisable at December 31, 2016 |  |  | 55 |  | $ | 30.31 |  |  | 0.96 |  | $ | 1,908 |
Summary of RSAs and RSUs Activity |
RSAs and RSUs |  | Shares (000s) |  | Weighted- Average Purchase Price |  | Weighted-Average Remaining Vesting Term (In Years) |  | Aggregate Intrinsic Value (000s) |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at January 2, 2016 |  |  | 1,554 |  | $ | — |  |  |  |  |  |  |
Granted |  |  | 1,169 |  | $ | — |  |  |  |  |  |  |
Vested or issued |  |  | (871 | ) | $ | — |  |  |  |  |  |  |
Cancelled or forfeited |  |  | (163 | ) | $ | — |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2016 |  |  | 1,689 |  | $ | — |  |  | 1.05 |  | $ | 109,807 |
Outstanding at December 31, 2016 and expected to vest |  |  | 1,568 |  | $ | — |  |  | 1.05 |  | $ | 101,940 |
Summary of PSUs and MSUs Activity |
PSUs and MSUs |  | Shares (000s) |  | Weighted- Average Purchase Price |  | Weighted-Average Remaining Vesting Term (In Years) |  | Aggregate Intrinsic Value (000s) |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Outstanding at January 2, 2016 |  |  | 250 |  | $ | — |  |  |  |  |  |  |
Granted |  |  | 131 |  | $ | — |  |  |  |  |  |  |
Cancelled or forfeited |  |  | (152 | ) | $ | — |  |  |  |  |  |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2016 |  |  | 229 |  | $ | — |  |  | 1.41 |  | $ | 14,855 |
Outstanding at December 31, 2016 and expected to vest |  |  | 184 |  | $ | — |  |  | 1.41 |  | $ | 11,928 |
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 31, 2016 |  | January 2, 2016 |  | January 3, 2015 |
Per grant of RSAs and RSUs |  | $ | 40.55 |  | $ | 49.14 |  | $ | 47.93 |
Per grant of PSUs and MSUs |  | $ | 32.23 |  | $ | 48.36 |  | $ | 60.08 |
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 31, 2016 |  | January 2, 2016 |  | January 3, 2015 |
Intrinsic value of stock options exercised |  | $ | 2,560 |  | $ | 6,612 |  | $ | 5,674 |
Intrinsic value of RSAs and RSUs that vested |  | $ | 36,502 |  | $ | 45,298 |  | $ | 32,138 |
Grant date fair value of RSAs and RSUs that vested |  | $ | 39,853 |  | $ | 41,072 |  | $ | 29,668 |
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 31, 2016 |  | January 2, 2016 |  | January 3, 2015 |
Cost of revenues |  | $ | 1,070 |  | $ | 960 |  | $ | 775 |
Research and development |  |  | 19,573 |  |  | 19,451 |  |  | 18,521 |
Selling, general and administrative |  |  | 18,985 |  |  | 22,380 |  |  | 19,771 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  |  | 39,628 |  |  | 42,791 |  |  | 39,067 |
Income tax benefit |  |  | 8,496 |  |  | 9,264 |  |  | 4,024 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
|  | $ | 31,132 |  | $ | 33,527 |  | $ | 35,043 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Summary of shares reserved of common stock for future issuance | As of December 31, 2016, the Company had reserved shares of common stock for future issuance as follows (in thousands):
2000 Stock Incentive Plan |  |  | 55 |
2009 Stock Incentive Plan |  |  | 1,935 |
2009 Employee Stock Purchase Plan |  |  | 447 |
​ | ​ | ​ | ​ | ​
Total shares reserved |  |  | 2,437 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
Stock options |
Schedule of assumptions used to estimate fair values using Black-Scholes option-pricing model for ESSP and stock options |
|  | Year Ended |
--- | --- | --- | ---
MSUs |  | December 31, 2016 |  | January 2, 2016 |  | January 3, 2015 |
Expected volatility |  |  | 30 | % |  | 31 | % |  | 33 | %
Risk-free interest rate % |  |  | 0.9 | % |  | 1.0 | % |  | 0.7 | %
Expected term (in years) |  |  | 2.9 |  |  | 2.9 |  |  | 2.8 |
Dividend yield |  |  | — |  |  | — |  |  | — |
Market Stock Units |
Schedule of assumptions used to estimate fair values using Monte Carlo simulation model for Stock Incentive Plan |
|  | Year Ended |
--- | --- | --- | ---
Stock Options |  | December 31, 2016 |  | January 2, 2016 |  | January 3, 2015 |
Expected volatility |  |  | 32 | % |  | — |  |  | — |
Risk-free interest rate % |  |  | 1.3 | % |  | — |  |  | — |
Expected term (in years) |  |  | 5.4 |  |  | — |  |  | — |
Dividend yield |  |  | — |  |  | — |  |  | — |
2009 Employee Stock Purchase Plan |
Schedule of assumptions used to estimate fair values using Black-Scholes option-pricing model for ESSP and stock options |
|  | Year Ended |
--- | --- | --- | ---
Employee Stock Purchase Plan |  | December 31, 2016 |  | January 2, 2016 |  | January 3, 2015 |
Expected volatility |  |  | 30 | % |  | 31 | % |  | 28 | %
Risk-free interest rate % |  |  | 0.6 | % |  | 0.2 | % |  | 0.2 | %
Expected term (in months) |  |  | 15 |  |  | 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 share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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