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Stock-Based Compensation (Tables) | 12 Months Ended
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Jan. 02, 2021
Stock-Based Compensation |
Summary of assumptions used to estimate fair values for ESPP | The fair values estimated from the Black-Scholes option-pricing model for ESPP shares granted were calculated using the following assumptions:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | January 2, | ​ | December 28, | ​ | December 29, | ​
Employee Stock Purchase Plan |  | 2021 |  | 2019 |  | 2018 | ​
Expected volatility | ​ | 67 | % | 37 | % | 30 | %
Risk-free interest rate % | ​ | 0.15 | % | 1.6 | % | 2.4 | %
Expected term (in months) | ​ | 9 | ​ | 9 | ​ | 9 | ​
Dividend yield | ​ | — | ​ | — | ​ | — | ​
Summary of assumptions used to estimate fair values for MSUs | The fair values estimated from the Monte Carlo simulation for MSUs were calculated using the following assumptions: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | January 2, | ​ | December 28, | ​ | December 29, | ​
MSUs |  | 2021 |  | 2019 |  | 2018 |
Expected volatility |  | 36 | % | 31 | % | 29 | %
Risk-free interest rate % |  | 1.3 | % | 2.4 | % | 2.4 | %
Expected term (in years) |  | 2.9 | ​ | 2.9 | ​ | 2.9 | ​
Dividend yield |  | — | ​ | — | ​ | — | ​
Summary of stock-based compensation activity, options | A summary of stock-based compensation activity with respect to fiscal 2020 follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Weighted-Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | Shares | ​ | Exercise | ​ | Contractual Term | ​ | Value
Stock Options |  | (000s) |  | Price |  | (In Years) |  | (000s)
Outstanding at December 28, 2019 |  | 137 | ​ | $ | 39.47 | ​ | ​ | ​ | ​ | ​
Outstanding at January 2, 2021 |  | 127 | ​ | $ | 39.16 |  | 5.11 | ​ | $ | 11,232
Vested at January 2, 2021 and expected to vest |  | 127 | ​ | $ | 39.16 |  | 5.11 | ​ | $ | 11,232
Exercisable at January 2, 2021 |  | 127 | ​ | $ | 39.16 |  | 5.11 | ​ | $ | 11,232
Summary of stock-based compensation activity, RSAs and RSUs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Weighted- | ​ | Weighted-Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | Shares | ​ | Purchase | ​ | Vesting Term | ​ | Value
RSAs and RSUs |  | (000s) |  | Price |  | (In Years) |  | (000s)
Outstanding at December 28, 2019 |  | 1,084 | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Granted |  | 610 | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Vested or issued |  | (546) | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (42) | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Outstanding at January 2, 2021 |  | 1,106 | ​ | $ | — |  | 1.06 | ​ | $ | 140,801
Outstanding at January 2, 2021 and expected to vest |  | 1,026 | ​ | $ | — |  | 1.06 | ​ | $ | 130,635
Summary of stock-based compensation activity, PSUs and MSUs | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- |  | Weighted-Average | ​ | Aggregate
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Intrinsic
​ | ​ | Shares | ​ | Purchase | ​ | Vesting Term | ​ | Value
PSUs and MSUs |  | (000s) |  | Price |  | (In Years) |  | (000s)
Outstanding at December 28, 2019 |  | 262 |  | $ | — | ​ | ​ | ​ | ​ | ​
Granted |  | 82 | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Earned or issued |  | (83) | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Cancelled or forfeited |  | (28) | ​ | $ | — | ​ | ​ | ​ | ​ | ​
Outstanding at January 2, 2021 |  | 233 | ​ | $ | — |  | 1.14 |  | $ | 29,703
Outstanding at January 2, 2021 and expected to vest |  | 215 |  | $ | — |  | 1.14 |  | $ | 27,390
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
​ | ​ | January 2, | ​ | December 28, | ​ | December 29,
​ |  | 2021 |  | 2019 |  | 2018
Per grant of RSAs and RSUs | ​ | $ | 100.27 |  | $ | 89.35 |  | $ | 93.75
Per grant of PSUs and MSUs | ​ | $ | 98.58 |  | $ | 85.79 |  | $ | 97.53
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
​ | ​ | January 2, | ​ | December 28, | ​ | December 29,
​ |  | 2021 |  | 2019 |  | 2018
Intrinsic value of stock options exercised | ​ | $ | 558 | ​ | $ | — | ​ | $ | 1,952
Intrinsic value of RSUs that vested | ​ | $ | 48,534 | ​ | $ | 57,693 | ​ | $ | 68,012
Grant date fair value of RSUs that vested | ​ | $ | 37,477 | ​ | $ | 40,434 | ​ | $ | 37,720
Intrinsic value of PSUs and MSUs that vested | ​ | $ | 8,545 | ​ | $ | 3,649 | ​ | $ | 3,562
Grant date fair value of PSUs and MSUs that vested | ​ | $ | 6,302 | ​ | $ | 1,461 | ​ | $ | 1,788
Schedule of stock-based compensation costs recognized in the Condensed 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
​ | ​ | January 2, | ​ | December 28, | ​ | December 29,
​ |  | 2021 |  | 2019 |  | 2018
Cost of revenues | ​ | $ | 1,477 | ​ | $ | 1,316 | ​ | $ | 1,238
Research and development | ​ |  | 29,212 | ​ |  | 26,187 | ​ |  | 23,867
Selling, general and administrative | ​ |  | 29,402 | ​ |  | 27,296 | ​ |  | 24,972
​ | ​ |  | 60,091 | ​ |  | 54,799 | ​ |  | 50,077
Income tax benefit | ​ |  | 3,616 | ​ |  | 2,476 | ​ |  | 8,890
​ | ​ | $ | 56,475 | ​ | $ | 52,323 | ​ | $ | 41,187
Summary of shares reserved of common stock for future issuance | As of January 2, 2021, the Company had reserved shares of common stock for future issuance as follows (in thousands):
​ | ​ | ​
2009 Stock Incentive Plan |  | 1,223
2009 Employee Stock Purchase Plan |  | 600
Total shares reserved |  | 1,823

X
- 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 number of shares reserved of common stock for future issuance under stock-based compensation arrangements. + 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 weighted-average grant-date fair value of restricted stock awards, restricted stock units and market stock units granted during the year. + References No definition available. + Details
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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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=120381028&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=120381028&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=120381028&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=120381028&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=120381028&loc=d3e5070-113901 + Details
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