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Capital Stock (Tables) | 12 Months Ended
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Dec. 30, 2017
Equity [Abstract] |
Summary of Restricted Stock Activity | The following table summarizes our restricted stock activity for the three years ended December 30, 2017:
|  | Shares |  |  | Weighted Average Price |
Balance at December 27, 2014 |  |  | 72,900 |  |  | $ | 27.82 |
Granted |  |  | 44,104 |  |  | $ | 45.68 |
Vested |  |  | (38,580 | ) |  | $ | 25.24 |
Cancelled |  |  | (35,182 | ) |  | $ | 44.84 |
Balance at December 26, 2015 |  |  | 43,242 |  |  | $ | 34.49 |
Granted |  |  | 133,794 |  |  | $ | 49.45 |
Vested |  |  | (29,002 | ) |  | $ | 29.74 |
Cancelled |  |  | (2,671 | ) |  | $ | 33.79 |
Balance at December 31, 2016 |  |  | 145,363 |  |  | $ | 49.22 |
Granted |  |  | 70,611 |  |  | $ | 78.27 |
Vested |  |  | (56,953 | ) |  | $ | 56.03 |
Cancelled |  |  | (5,294 | ) |  | $ | 51.56 |
Balance at December 30, 2017 |  |  | 153,727 |  |  | $ | 59.96 |
Schedule of Weighted Average Valuation Assumptions Used to Calculate Fair Value of Options Granted | The following table summarizes the weighted average valuation assumptions used to calculate the fair value of options granted:
|  | 2017 |  |  | 2016 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Expected stock price volatility |  |  | 27 | % |  |  | 26 | %
Risk-free interest rate |  |  | 1.5 | % |  |  | 0.9 | %
Expected life of options |  | 3.0 years |  |  | 3.0 years |
Summary of Stock Option Activity | The following table summarizes our stock option activity for the three years ended December 30, 2017:
|  | Shares |  |  | Option Price per Share |  | Weighted Average Price |  |  | Weighted Average Remaining Terms (years) |  |  | Aggregate Intrinsic Value |
Balance at December 27, 2014 |  |  | 75,000 |  |  | $5.05 – $19.37 |  | $ | 7.28 |  |  |  |  |  |  |  |  |
Exercised |  |  | (35,000 | ) |  | $5.05 – $19.37 |  | $ | 7.76 |  |  |  |  |  |  |  |  |
Balance at December 26, 2015 |  |  | 40,000 |  |  | $5.67 – $7.74 |  | $ | 6.86 |  |  |  |  |  |  |  |  |
Granted |  |  | 61,084 |  |  | $41.59 – $53.32 |  | $ | 44.36 |  |  |  |  |  |  |  |  |
Balance at December 31, 2016 |  |  | 101,084 |  |  | $5.67 – $53.32 |  | $ | 29.52 |  |  |  |  |  |  |  |  |
Granted |  |  | 58,024 |  |  | $69.02 – $82.59 |  | $ | 78.58 |  |  |  |  |  |  |  |  |
Exercised |  |  | (32,751 | ) |  | $6.90 – $41.59 |  | $ | 7.69 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (3,810 | ) |  | $41.59 – $78.64 |  | $ | 56.72 |  |  |  |  |  |  |  |  |
Balance at December 30, 2017 |  |  | 122,547 |  |  | $5.67 – $82.59 |  | $ | 57.74 |  |  |  | 3.6 |  |  | $ | 1,402,012 |
Options exercisable at December 30, 2017 |  |  | 22,520 |  |  | $5.67 – $53.32 |  | $ | 31.07 |  |  |  | 2.6 |  |  | $ | 677,188 |
Summary of Information Concerning Currently Outstanding and Exercisable Options | The following table summarizes information concerning currently outstanding and exercisable options at December 30, 2017:
|  |  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Price |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Life (years) |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
| $5.67 - $24.66 |  |  |  | 8,000 |  |  |  | 1.4 |  |  | $ | 6.71 |  |  |  | 8,000 |  |  | $ | 6.71 |
| $26.67 - $41.60 |  |  |  | 43,679 |  |  |  | 3.1 |  |  | $ | 41.59 |  |  |  | 10,920 |  |  | $ | 41.59 |
| $41.61 - $69.01 |  |  |  | 14,400 |  |  |  | 3.5 |  |  | $ | 53.32 |  |  |  | 3,600 |  |  | $ | 53.32 |
| $69.02 - $77.99 |  |  |  | 1,630 |  |  |  | 5.1 |  |  | $ | 69.02 |  |  |  | — |  |  | $ | — |
| $77.80 - $82.59 |  |  |  | 54,838 |  |  |  | 4.2 |  |  | $ | 78.86 |  |  |  | — |  |  | $ | — |
Balance at December 30, 2017 |  |  | 122,547 |  |  |  | 3.6 |  |  | $ | 57.74 |  |  |  | 22,520 |  |  | $ | 31.07 |

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