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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 26, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Assumptions Used in Estimating Fair Value of Each Option Grant | The fair value of each option grant made in 2020, 2019 and 2018 was estimated using the following assumptions:
| 2020 |  | 2019 |  | 2018
Expected volatility | 33.72 | % |  | 33.13 | % |  | 33.39 | %
Risk-free interest rate | 0.43 | % |  | 1.69 | % |  | 2.67 | %
Expected life from vesting date | 4.0 yrs |  | 3.0 yrs |  | 3.0 yrs
Dividend yield | 1.24 | % |  | 1.07 | % |  | 1.07 | %
Summary of Activity of Stock Plans | Following is a summary of the stock option activity during 2018, 2019 and 2020:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 30, 2017 | 570,622 |  |  | $ | 128.34 |  |  |  |  |
Granted | 105,135 |  |  | 112.08 |  |  |  |  |
Exercised | (63,717) |  |  | 106.26 |  |  |  |  |
Forfeited | (33,627) |  |  | 129.52 |  |  |  |  |
Outstanding at December 29, 2018 | 578,413 |  |  | $ | 127.74 |  |  | 4.35 |  | $ | 909 |
Options vested or expected to vest at December 29, 2018 | 565,592 |  |  | $ | 127.84 |  |  | 4.30 |  | 909 |
Options exercisable at December 29, 2018 | 405,128 |  |  | $ | 126.61 |  |  | 3.47 |  | 909 |
The weighted average per share fair value of options granted during 2018 was $30.48.
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 29, 2018 | 578,413 |  |  | $ | 127.74 |  |  |  |  |
Granted | 57,648 |  |  | 147.31 |  |  |  |  |
Exercised | (119,789) |  |  | 113.02 |  |  |  |  |
Forfeited | (27,712) |  |  | 137.07 |  |  |  |  |
Outstanding at December 28, 2019 | 488,560 |  |  | $ | 133.13 |  |  | 4.04 |  | $ | 9,291 |
Options vested or expected to vest at December 28, 2019 | 478,575 |  |  | $ | 133.21 |  |  | 3.99 |  | 9,078 |
Options exercisable at December 28, 2019 | 341,828 |  |  | $ | 133.32 |  |  | 3.19 |  | 6,470 |
The weighted average per share fair value of options granted during 2019 was $37.85.
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 28, 2019 | 488,560 |  |  | $ | 133.13 |  |  |  |  |
Granted | 66,231 |  |  | 168.80 |  |  |  |  |
Exercised | (147,014) |  |  | 125.43 |  |  |  |  |
Forfeited | (8,212) |  |  | 137.49 |  |  |  |  |
Outstanding at December 26, 2020 | 399,565 |  |  | $ | 141.79 |  |  | 4.88 |  | $ | 12,103 |
Options vested or expected to vest at December 26, 2020 | 389,633 |  |  | $ | 141.56 |  |  | 4.81 |  | 11,890 |
Options exercisable at December 26, 2020 | 254,498 |  |  | $ | 138.64 |  |  | 3.38 |  | 8,510 |
The weighted average per share fair value of options granted during 2020 was $45.49.
Summary of Status of Stock Options Outstanding | Following is a summary of the status of stock options outstanding at December 26, 2020:
Outstanding and Exercisable By Price Range
Options Outstanding |  | Options Exercisable
Exercise Price Range |  | Number |  | Weighted Average Remaining Contractual Life |  | Weighted Average Exercise Price |  | Number |  | Weighted Average Exercise Price
$104.47 - 112.08 |  | 120,194 |  |  | 3.99 years |  | $ | 109.58 |  |  | 79,796 |  |  | $ | 108.31 |
$123.87 - 132.84 |  | 26,282 |  |  | 0.97 years |  | 132.48 |  |  | 26,282 |  |  | 132.48 |
$142.67 - 168.80 |  | 253,089 |  |  | 5.71 years |  | 158.05 |  |  | 148,420 |  |  | 156.04 |
|  | 399,565 |  |  |  |  |  |  | 254,498 |  |  |
Schedule of Non-Vested Stock and Restricted Stock Units | During fiscal 2020, 2019 and 2018, the Company granted restricted stock units to directors and certain management employees as follows (which are not included in the above stock plan activity tables):
| 2020 |  | 2019 |  | 2018
Shares granted | 85,251 |  |  | 78,318 |  |  | 88,127 |
Weighted‑average per share price on grant date | $ | 161.73 |  |  | $ | 145.89 |  |  | $ | 114.89 |
Recognized compensation expense | $ | 9,081 |  |  | $ | 8,815 |  |  | $ | 6,328 |

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