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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2022
Share-Based Payment Arrangement [Abstract] |
Schedule of Additional Information Regarding Stock Based Compensation | Certain information regarding our stock-based compensation was as follows (in thousands, except per share amounts):
| Fiscal Year Ended
| December 31, 2022 |  | December 25, 2021 |  | December 26, 2020
Weighted average grant date per share fair value of RSUs granted | $ | 34.83 |  |  | $ | 36.12 |  |  | $ | 25.96 |
Total intrinsic value of stock options exercised | — |  |  | 3,179 |  |  | 4,688 |
Fair value of RSUs vested | 42,324 |  |  | 54,948 |  |  | 42,597 |
Schedule of Stock-based Compensation Expense | Pre-tax stock-based compensation expense by financial statement line and related tax benefit in the Consolidated Statements of Income are as follows (in thousands):
| Fiscal Year Ended
| December 31, 2022 |  | December 25, 2021 |  | December 26, 2020
Stock-based compensation expense included in: |  |  |  |  |
Cost of revenues | $ | 3,807 |  |  | $ | 5,200 |  |  | $ | 3,951 |
Research and development | 8,217 |  |  | 7,583 |  |  | 5,824 |
Selling, general and administrative | 19,313 |  |  | 16,601 |  |  | 14,055 |
Total stock-based compensation | $ | 31,337 |  |  | $ | 29,384 |  |  | $ | 23,830 |
Stock-based compensation tax benefit | $ | 2,772 |  |  | $ | 6,118 |  |  | $ | 4,962 |
Schedule of Unrecognized Compensation Expense | Unrecognized stock-based compensation expense at December 31, 2022 consisted of the following (in thousands):
|  | Unrecognized Expense |  | Weighted Average Recognition Period (Years)
Restricted stock units |  | $ | 45,726 |  |  | 2.1
Performance restricted stock units |  | 12,216 |  |  | 2.0
Employee stock purchase plan |  | 424 |  |  | 0.1
Total unrecognized stock-based compensation expense |  | $ | 58,366 |  |  | 2.1
Schedule of Assumptions, Fair Value of PRSUs | The following assumptions were used in estimating the fair value of PRSUs:
| Fiscal Year Ended
| December 31, 2022 |  | December 25, 2021 |  | December 26, 2020
PRSUs: |  |  |  |  |
Dividend yield | — | % |  | — | % |  | — | %
Expected volatility | 53.0 | % |  | 52.5 | % |  | 52.0 | %
Risk-free interest rate | 2.8 | % |  | 0.3 | % |  | 0.2 | %
Expected life (in years) | 2.9 |  | 2.9 |  | 2.8
Schedule of Assumptions, Fair Value of Employee Purchase Rights | The following assumptions were used in estimating the fair value of shares under the Employee Stock Purchase Plan:
| Fiscal Year Ended
| December 31, 2022 |  | December 25, 2021 |  | December 26, 2020
Employee Stock Purchase Plan: |  |  |  |  |
Dividend yield | — | % |  | — | % |  | — | %
Expected volatility | 42.6% - 60.8% |  | 33.6% - 74.4% |  | 30.4% - 74.4%
Risk-free interest rate | 0.1% - 3.0% |  | 0.1% - 1.5% |  | 0.1% - 1.5%
Expected life (in years) | 0.5 - 1.0 |  | 0.5 - 1.0 |  | 0.5 - 1.0

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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