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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of assumptions used in estimating fair value of each option grant |
| 2016 |  | 2015 |  | 2014
Expected volatility | 33.88 | % |  | 34.13 | % |  | 32.27 | %
Risk-free interest rate | 1.83 | % |  | 1.58 | % |  | 1.43 | %
Expected life from vesting date | 3.0 yrs |  |  | 3.0 yrs |  |  | 3.0 yrs |
Dividend yield | 1.13 | % |  | 0.94 | % |  | 0.75 | %
Summary of activity of stock plans | Following is a summary of the activity of the stock plans during 2014, 2015 and 2016:
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 28, 2013 | 795,221 |  |  | $ | 99.29 |  |  |  |  |
Granted | 177,717 |  |  | 132.94 |  |  |  |  |
Exercised | (194,627 | ) |  | (71.67 | ) |  |  |  |
Forfeited | (9,716 | ) |  | (126.23 | ) |  |  |  |
Outstanding at December 27, 2014 | 768,595 |  |  | $ | 113.72 |  |  | 4.74 |  | $ | 15,983 |
Options vested or expected to vest at December 27, 2014 | 746,974 |  |  | $ | 113.06 |  |  | 4.69 |  | 15,981 |
Options exercisable at December 27, 2014 | 450,539 |  |  | $ | 97.29 |  |  | 3.59 |  | 15,944 |
The weighted average per share fair value of options granted during 2014, was $33.94.
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term |  | Aggregate Intrinsic Value
Outstanding at December 27, 2014 | 768,595 |  |  | $ | 113.72 |  |  |  |  |
Granted | 291,708 |  |  | 104.89 |  |  |  |  |
Exercised | (169,493 | ) |  | 74.37 |  |  |  |  |
Forfeited | (41,201 | ) |  | 137.02 |  |  |  |  |
Outstanding at December 26, 2015 | 849,609 |  |  | $ | 117.42 |  |  | 5.18 |  | $ | 4,536 |
Options vested or expected to vest at December 26, 2015 | 818,300 |  |  | $ | 117.61 |  |  | 5.13 |  | 4,456 |
Options exercisable at December 26, 2015 | 409,068 |  |  | $ | 119.43 |  |  | 3.74 |  | 3,376 |
The weighted average per share fair value of options granted during 2015 was $27.91. (11) STOCK-BASED COMPENSATION (Continued)
| 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.
Summary of status of stock options outstanding | Following is a summary of the status of stock options outstanding at December 31, 2016:
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
$83.94 - 105.44 |  | 347,914 |  |  | 5.06 years |  | $ | 100.47 |  |  | 162,533 |  |  | $ | 95.93 |
$110.33 - 132.84 |  | 147,717 |  |  | 4.95 years |  | 132.17 |  |  | 94,517 |  |  | 132.44 |
$136.42 - 151.90 |  | 297,542 |  |  | 4.36 years |  | 144.18 |  |  | 212,794 |  |  | 141.15 |
|  | 793,173 |  |  |  |  |  |  | 469,844 |  |  |
Schedule of non-vested stock and restricted stock units |
| 2016 |  | 2015 |  | 2014
Shares issued | 58,961 |  |  | 47,038 |  |  | 35,885 |
Weighted‑average per share price on grant date | $ | 150.48 |  |  | $ | 108.97 |  |  | $ | 136.91 |
Recognized compensation expense | $ | 4,069 |  |  | $ | 4,511 |  |  | $ | 3,978 |

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