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Capital Stock (Tables) | 12 Months Ended
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Dec. 28, 2019
Schedule of Weighted Average Valuation Assumptions Used to Calculate Fair Value Granted | The following table summarizes the weighted average valuation assumptions used to calculate the fair value of options granted:
|  | 2019 |  |  | 2018 |  |  | 2017 |
Expected dividend yield |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected stock price volatility |  |  | 28 | % |  |  | 27 | % |  |  | 27 | %
Risk-free interest rate |  |  | 2.3 | % |  |  | 2.6 | % |  |  | 1.5 | %
Expected life of options |  | 5.4 years |  |  | 3.0 years |  |  | 3.0 years |
Summary of Restricted Stock Activity | The following table summarizes our restricted stock activity for the three years ended December 28, 2019:
|  | Shares |  |  | Weighted Average Price |
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 |  |  | $ | 59.94 |
Granted |  |  | 89,798 |  |  | $ | 73.51 |
Vested |  |  | (45,707 | ) |  | $ | 62.56 |
Cancelled |  |  | (27,081 | ) |  | $ | 75.39 |
Balance at December 29, 2018 |  |  | 170,737 |  |  | $ | 63.94 |
Granted |  |  | 92,396 |  |  | $ | 81.92 |
Vested |  |  | (41,586 | ) |  | $ | 55.72 |
Cancelled |  |  | (44,056 | ) |  | $ | 58.03 |
Balance at December 28, 2019 |  |  | 177,491 |  |  | $ | 76.70 |
Summary of Stock Option Activity | The following table summarizes our stock option activity for the three years ended December 28, 2019:
|  | Shares |  |  | Option Price per Share |  |  | Weighted Average Price |  |  | Weighted Average Remaining Terms (years) |  |  | Aggregate Intrinsic Value |
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 |  |  |  |  |  |  |  |  |
Granted |  |  | 81,995 |  |  | $68.93 – $82.94 |  |  | $ | 73.84 |  |  |  |  |  |  |  |  |
Exercised |  |  | (15,113 | ) |  | $5.67 – $78.64 |  |  | $ | 39.38 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (960 | ) |  | $ | 72.55 |  |  | $ | 72.55 |  |  |  |  |  |  |  |  |
Balance at December 29, 2018 |  |  | 188,469 |  |  | $7.74 – $82.94 |  |  | $ | 66.14 |  |  |  |  |  |  |  |  |
Granted |  |  | 44,025 |  |  | $73.72 – $84.93 |  |  | $ | 81.84 |  |  |  |  |  |  |  |  |
Exercised |  |  | (38,009 | ) |  | $7.74 – $78.76 |  |  | $ | 58.96 |  |  |  |  |  |  |  |  |
Cancelled |  |  | (12,773 | ) |  | $41.59 – $82.94 |  |  | $ | 75.52 |  |  |  |  |  |  |  |  |
Balance at December 28, 2019 |  |  | 181,712 |  |  | $41.59 – $84.93 |  |  | $ | 70.78 |  |  |  | 3.8 |  |  | $ | 1,308,808 |
Options exercisable at December 28, 2019 |  |  | 63,432 |  |  | $41.59 – $82.94 |  |  | $ | 62.39 |  |  |  | 2.3 |  |  | $ | 897,145 |
Summary of Information Concerning Currently Outstanding and Exercisable Options | The following table summarizes information concerning currently outstanding and exercisable options at December 28, 2019:
|  |  |  | 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 |
| $41.59 - $61.13 |  |  |  | 38,848 |  |  |  | 1.3 |  |  | $ | 45.94 |  |  |  | 29,136 |  |  | $ | 45.94 |
| $61.14 - $73.13 |  |  |  | 52,413 |  |  |  | 3.9 |  |  | $ | 71.89 |  |  |  | 13,762 |  |  | $ | 71.68 |
| $73.14 - $78.70 |  |  |  | 24,654 |  |  |  | 3.4 |  |  | $ | 77.60 |  |  |  | 9,650 |  |  | $ | 78.64 |
| $78.71 - $82.31 |  |  |  | 35,803 |  |  |  | 5.2 |  |  | $ | 80.65 |  |  |  | 6,871 |  |  | $ | 78.76 |
| $82.32 - $84.93 |  |  |  | 29,994 |  |  |  | 5.6 |  |  | $ | 83.66 |  |  |  | 4,013 |  |  | $ | 82.83 |
Balance at December 28, 2019 |  |  | 181,712 |  |  |  | 3.8 |  |  | $ | 70.78 |  |  |  | 63,432 |  |  | $ | 62.39 |
Performance Restricted Stock [Member] |
Schedule of Weighted Average Valuation Assumptions Used to Calculate Fair Value Granted | The following table summarizes the weighted average valuation assumptions used to calculate the fair value of total shareholder return performance restricted stock granted:
|  | 2019 |
Share price |  | $ | 82.03 |
Expected dividend yield |  |  | 0.0 | %
Expected stock price volatility |  |  | 27.7 | %
Risk-free interest rate |  |  | 2.5 | %
Expected life |  | 2.8 years |

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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