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Stock-Based Compensation Expense (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 04, 2021 USD ($) group $ / shares shares | Jun. 28, 2020 USD ($) $ / shares shares | Jul. 04, 2021 USD ($) group $ / shares shares | Jun. 28, 2020 USD ($) $ / shares shares | Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant-date fair values, in dollars per share | $ / shares | $ 32.07 | $ 19.13 | $ 33.47 | $ 18.52 |
Total intrinsic value | $ 11,621,000 | $ 39,359,000 | $ 53,948,000 | $ 53,814,000 |
Total fair values of stock options vest | $ 1,830,000 | 1,287,000 | $ 37,430,000 | 37,951,000 |
Groups within the employee population | group | 2 |  | 2 |  |
Estimated annual forfeiture rate for unvested options for senior management | 8.00% |  | 8.00% |  |
Estimated annual forfeiture rate for unvested options for all other employees | 12.00% |  | 12.00% |  |
Increase (decrease) to compensation expense |  |  | $ 255,000 | 1,787,000 |
Unrecognized compensation expense | $ 63,625,000 |  | $ 63,625,000 |  |
Weighted average period to be recognized |  |  | 1 year 9 months 18 days |  |
Stock-based compensation expense | 10,730,000 | 8,018,000 | $ 22,739,000 | 22,808,000 |
Tax benefit from compensation expense | 1,651,000 | 1,277,000 | 3,464,000 | $ 3,841,000 |
Credits relating to grants cancelled |  | $ 1,401,000 |  |  |
Recognized period costs capitalized | $ 0 |  | $ 0 |  | $ 0
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for grant under stock option plans (in shares) | shares | 15,692,000 |  | 15,692,000 |  |
Expiration period from grant day |  |  | 10 years |  |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  |  | 3 years |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted (in dollars per share) | $ / shares | $ 75.98 | $ 56.97 | $ 87.46 | $ 51.53 |
Vested (in shares) | shares | 13,000 | 0 | 15,000 | 0 |
Minimum | General Stock Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  |  | 4 years |  |
Maximum | General Stock Option Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period for stock option plans |  |  | 5 years |  |

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