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Share-Based Compensation - Restricted Shares and Other (Details) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 28, 2019 USD ($) item $ / shares shares | Dec. 29, 2018 USD ($) $ / shares shares | Dec. 30, 2017 USD ($) shares
2006 Incentive Plan |  |  |
Additional disclosures |  |  |
Shares available for grant | 623,212 |  |
Options |  |  |
Additional disclosures |  |  |
Fair value of options vested | $ | $ 0.7 | $ 1.1 | $ 1.5
Unrecognized compensation cost, net of expected forfeitures | $ | $ 0.5 |  |
Weighted-average period over which cost is expected to be recognized | 2 years 6 months |  |
Forfeiture rate (as a percent) |  | 0.40% | 0.40%
Restricted stock |  |  |
Additional disclosures |  |  |
Number of vesting installments | item | 4 |  |
Unrecognized compensation cost, net of expected forfeitures | $ | $ 0.9 |  |
Weighted-average period over which cost is expected to be recognized | 2 years 7 months 6 days |  |
Forfeiture rate (as a percent) | 0.90% |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Fair value of restricted shares vested | $ | $ 0.5 | $ 0.6 | $ 0.6
Restricted stock | 2006 Incentive Plan |  |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 36,006 |  |
Granted (in shares) | 11,772 |  |
Vested (in shares) | (16,255) |  |
Balance at the end of the period (in shares) | 31,523 | 36,006 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 35.41 |  |
Granted (in dollars per share) | $ / shares | 38.21 |  |
Vested (in dollars per share) | $ / shares | 31.14 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 38.66 | $ 35.41 |
Time-Vesting RSUs |  |  |
Additional disclosures |  |  |
Number of vesting installments | item | 4 |  |
Unrecognized compensation cost, net of expected forfeitures | $ | $ 2.4 |  |
Weighted-average period over which cost is expected to be recognized | 3 years 1 month 6 days |  |
Forfeiture rate (as a percent) | 0.90% |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Fair value of restricted shares vested | $ | $ 1.3 | $ 1.7 | $ 2.0
Time-Vesting RSUs | 2006 Incentive Plan |  |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 79,759 |  |
Granted (in shares) | 31,226 |  |
Vested (in shares) | (45,858) |  |
Forfeited (in shares) | (489) |  |
Balance at the end of the period (in shares) | 64,638 | 79,759 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 33.64 |  |
Granted (in dollars per share) | $ / shares | 46.20 |  |
Vested (in dollars per share) | $ / shares | 27.91 |  |
Forfeited (in dollars per share) | $ / shares | 21.52 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 43.87 | $ 33.64 |
PRSU |  |  |
Additional disclosures |  |  |
Vesting period | 2 years |  |
PRSU | Vesting in the first year following performance period |  |  |
Additional disclosures |  |  |
Vesting percentage | 75.00% |  |
PRSU | Vesting on the fourth anniversary of date of grant |  |  |
Additional disclosures |  |  |
Vesting percentage | 25.00% |  |
PRSU | Minimum |  |  |
Additional disclosures |  |  |
PRSUs performance measure (as a percent) | 50.00% |  |
PRSU | Maximum |  |  |
Additional disclosures |  |  |
PRSUs performance measure (as a percent) | 125.00% |  |
PRSU | 2006 Incentive Plan |  |  |
Restricted Stock and Stock Units, Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 121,950 |  |
Granted (in shares) | 29,234 |  |
Vested (in shares) | (65,976) |  |
Forfeited (in shares) | (3,058) |  |
Balance at the end of the period (in shares) | 82,150 | 121,950 |
Restricted Stock and Stock Units, Weighted-Average Grant Date Fair Value |  |  |
Balance at the beginning of the period (in dollars per share) | $ / shares | $ 32.92 |  |
Granted (in dollars per share) | $ / shares | 51.31 |  |
Vested (in dollars per share) | $ / shares | 25.27 |  |
Forfeited (in dollars per share) | $ / shares | 28.77 |  |
Balance at the end of the period (in dollars per share) | $ / shares | $ 45.88 | $ 32.92 |
Additional disclosures |  |  |
Achievement percentage (as a percent) | 125.00% |  |
1998 Employee Stock Purchase Plan (ESPP) |  |  |
Additional disclosures |  |  |
Number of shares authorized | 243,000 |  |
Purchase price as a percentage of fair market value (as a percent) | 85.00% |  |
Offering period under the plan (in years) | 1 year |  |
Offering period (in years) | 0 years | 0 years | 0 years
Shares issued | 0 | 0 | 0
Shares available for grant | 211,777 |  |

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