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Stock Incentive Plans (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 30, 2018 USD ($) shares | Dec. 31, 2017 USD ($) Period shares | Dec. 25, 2016 USD ($) Period
Share-based compensation plan disclosures |  |  |
Total stock-based compensation cost | $ 4.0 | $ 4.8 | $ 4.5
Income tax benefits from stock-based compensation cost | 0.5 | $ 1.5 | $ 0.4
Total unrecognized compensation cost | $ 4.8 |  |
Number of performance periods | Period |  | 3 | 1
Stock Options |  |  |
Share-based compensation plan disclosures |  |  |
Shares outstanding | shares | 483,000 | 469,000 |
Weighted average remaining vesting period | 2 years 1 month 6 days |  |
Restricted Stock |  |  |
Share-based compensation plan disclosures |  |  |
Weighted average remaining vesting period | 1 year 7 months 6 days |  |
Number of common shares issued per RSU or PSU | shares | 1 |  |
Restricted Stock | Board of Directors |  |  |
Share-based compensation plan disclosures |  |  |
Vesting period | 1 year |  |
Performance Stock Units |  |  |
Share-based compensation plan disclosures |  |  |
Weighted average remaining vesting period | 1 year 6 months |  |
Number of common shares issued per RSU or PSU | shares |  | 1 |
Performance Stock Units | Last day of annual fiscal year one |  |  |
Share-based compensation plan disclosures |  |  |
Vesting percentage | 33.33% |  |
Performance Stock Units | Last day of annual fiscal year two |  |  |
Share-based compensation plan disclosures |  |  |
Vesting percentage | 33.33% |  |
Performance Stock Units | Last day of annual fiscal year three |  |  |
Share-based compensation plan disclosures |  |  |
Vesting percentage | 33.33% |  |
2017 and 2007 Performance Incentive Plans |  |  |
Share-based compensation plan disclosures |  |  |
Period following the change in control during which termination of an individual without cause will trigger vesting of award | 2 years |  |
2017 Stock Plan |  |  |
Share-based compensation plan disclosures |  |  |
Maximum number of shares of the company's common stock that may be issued or transferred | shares | 630,182 |  |
2007 Stock Plan |  |  |
Share-based compensation plan disclosures |  |  |
Shares outstanding | shares | 374,019 |  |
2007 Stock Plan | Time Based RSUs |  |  |
Share-based compensation plan disclosures |  |  |
Vesting period | 4 years |  |
Other stock-based compensation plans |  |  |
Share-based compensation plan disclosures |  |  |
Expiration term | 10 years |  |
Long-Term Cash Incentive Plan | Deferred compensation, excluding share-based payments and retirement benefits |  |  |
Share-based compensation plan disclosures |  |  |
Performance and vesting period | 3 years | 1 year | 3 years
Compensation expense | $ 0.7 | $ 0.4 | $ 2.3
Payments of performance stock awards |  | 0.7 | $ 3.4
Long-Term Cash Incentive Plan | Deferred compensation, excluding share-based payments and retirement benefits | Accrued payroll liabilities and payroll-related liabilities |  |  |
Share-based compensation plan disclosures |  |  |
Long-term cash incentive plan liability | $ 0.7 | $ 0.4 |
Minimum | 2007 Stock Plan |  |  |
Share-based compensation plan disclosures |  |  |
Vesting period | 1 year |  |
Maximum | 2007 Stock Plan |  |  |
Share-based compensation plan disclosures |  |  |
Vesting period | 4 years |  |

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