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Stock Incentive Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 27, 2020 | Dec. 29, 2019 | Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 275,000 | 660,000 |
Total stock-based compensation cost | $ 4.3 | $ 3.3 | $ 4.0
Income tax benefits from stock-based compensation cost | 0.3 | $ 0.3 | $ 0.5
Total unrecognized compensation cost | $ 8.2 |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares outstanding | 470,000 | 288,000 |
Weighted average remaining vesting period | 1 year 2 months 8 days |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average remaining vesting period | 1 year 1 month 13 days |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average remaining vesting period | 1 year 9 months 25 days |  |
2017 Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum number of shares of the company's common stock that may be issued or transferred (in shares) | 1,565,182 |  | 630,182
2017 Stock Plan | Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years | 3 years |
2017 and 2007 Performance Incentive Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period following the change in control during which termination of an individual without cause will trigger vesting of award | 2 years |  |
Expiration Term | 10 years |  |
2017 and 2007 Performance Incentive Plans | Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
2007 Performance Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares outstanding | 219,874 |  |
Minimum | 2017 and 2007 Performance Incentive Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Maximum | 2017 and 2007 Performance Incentive Plans |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |

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