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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 29, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of assumptions used in estimating fair value of each option grant |
| 2018 |  | 2017 |  | 2016
Expected volatility | 33.39 | % |  | 33.76 | % |  | 33.88 | %
Risk-free interest rate | 2.67 | % |  | 2.12 | % |  | 1.83 | %
Expected life from vesting date | 3.0 yrs |  |  | 3.0 yrs |  |  | 3.0 yrs |
Dividend yield | 1.07 | % |  | 1.17 | % |  | 1.13 | %
Summary of activity of stock plans | Following is a summary of the stock option activity during 2016, 2017 and 2018:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 26, 2015 | 849,609 |  |  | $ | 117.42 |  |  |  |  |
Granted | 85,092 |  |  | 151.37 |  |  |  |  |
Exercised | (109,893 | ) |  | 101.69 |  |  |  |  |
Forfeited | (31,635 | ) |  | 129.36 |  |  |  |  |
Outstanding at December 31, 2016 | 793,173 |  |  | $ | 122.77 |  |  | 4.78 |  | $ | 16,640 |
Options vested or expected to vest at December 31, 2016 | 774,139 |  |  | $ | 124.18 |  |  | 4.75 |  | 16,200 |
Options exercisable at December 31, 2016 | 469,844 |  |  | $ | 123.75 |  |  | 3.96 |  | 9,056 |
The weighted average per share fair value of options granted during 2016 was $40.00.
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 31, 2016 | 793,173 |  |  | $ | 122.77 |  |  |  |  |
Granted | 67,965 |  |  | 164.35 |  |  |  |  |
Exercised | (284,574 | ) |  | 121.92 |  |  |  |  |
Forfeited | (5,942 | ) |  | 104.26 |  |  |  |  |
Outstanding at December 30, 2017 | 570,622 |  |  | $ | 128.34 |  |  | 4.66 |  | $ | 21,806 |
Options vested or expected to vest at December 30, 2017 | 558,114 |  |  | $ | 128.00 |  |  | 4.63 |  | 21,517 |
Options exercisable at December 30, 2017 | 351,794 |  |  | $ | 123.90 |  |  | 3.94 |  | 15,005 |
The weighted average per share fair value of options granted during 2017 was $43.68.
| 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 | 565,952 |  |  | $ | 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.
Summary of status of stock options outstanding | Following is a summary of the status of stock options outstanding at December 29, 2018:
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 - 114.11 |  | 277,757 |  |  | 5.09 years |  | $ | 107.39 |  |  | 171,607 |  |  | $ | 104.47 |
$120.91 - 136.42 |  | 114,910 |  |  | 2.25 years |  | 134.02 |  |  | 114,627 |  |  | 134.01 |
$142.67 - 164.35 |  | 185,746 |  |  | 4.55 years |  | 154.31 |  |  | 118,894 |  |  | 151.44 |
|  | 578,413 |  |  |  |  |  |  | 405,128 |  |  |
Schedule of non-vested stock and restricted stock units |
| 2018 |  | 2017 |  | 2016
Shares granted | 88,127 |  |  | 62,160 |  |  | 58,961 |
Weighted‑average per share price on grant date | $ | 114.89 |  |  | $ | 163.18 |  |  | $ | 150.48 |
Recognized compensation expense | $ | 6,328 |  |  | $ | 5,569 |  |  | $ | 4,069 |

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