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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 28, 2019
Share-based Payment Arrangement [Abstract] |
Share-based Compensation, Stock Options, Activity | The following table provides a reconciliation of outstanding stock options for the fiscal year ended December 28, 2019.
| Shares Under Option |  | Weighted Average Price |  | Weighted Average Remaining Contract Life (Years) |  | Aggregate Intrinsic Value (000’s)
Outstanding December 29, 2018 | 669,356 |  |  | $ | 116.29 |  |  |  |  |
Granted | 76,742 |  |  | 199.24 |  |  |  |  |
Exercised | (134,982 | ) |  | 97.22 |  |  |  |  |
Forfeited | (10,651 | ) |  | 108.23 |  |  |  |  |
Outstanding December 28, 2019 | 600,465 |  |  | 131.32 |  |  | 4.6 |  | $ | 37,048 |
Exercisable December 28, 2019 | 413,109 |  |  | 111.65 |  |  | 4.0 |  | 33,215 |
Schedule of Nonvested Restricted Stock Units Activity | The following table provides a reconciliation of non-vested restricted share and share unit awards ("RSU") for the fiscal year ended December 28, 2019.
| Shares |  | Weighted Average Grant-Date Fair Value
Nonvested December 29, 2018 | 160,794 |  |  | $ | 164.61 |
Granted | 70,225 |  |  | 195.71 |
Vested | (84,990 | ) |  | 154.38 |
Forfeited | (11,893 | ) |  | 181.70 |
Nonvested December 28, 2019 | 134,136 |  |  | 185.86 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions | The Company uses the Black-Scholes option valuation model to determine the fair value of stock option awards granted. The weighted average fair value of and related assumptions for options granted are as follows:
| 2019 |  | 2018 |  | 2017
Weighted average fair value of options granted | $47.63 |  | $45.19 |  | $30.77
Assumptions: |  |  |  |  |
Risk-free interest rate | 2.33% |  | 2.79% |  | 1.79%
Expected dividend yield | 0.86% |  | 0.77% |  | 0.86%
Expected stock price volatility | 27.0% |  | 25.0% |  | 23.0%
Expected life of options (years) | 4.4 |  | 4.4 |  | 4.4

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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