STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 28, 2019

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 2019, 2018 and 2017 was estimated using the following assumptions:

	2019		2018		2017
Expected volatility	33.13	%	33.39	%	33.76	%
Risk-free interest rate	1.69	%	2.67	%	2.12	%
Expected life from vesting date	3.0 yrs		3.0 yrs		3.0 yrs
Dividend yield	1.07	%	1.07	%	1.17	%

Summary of activity of stock plans

Following is a summary of the stock option activity during 2017, 2018 and 2019:

	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

(12) STOCK-BASED COMPENSATION (Continued)

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.

Summary of status of stock options outstanding

Following is a summary of the status of stock options outstanding at December 28, 2019:

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	183,658	4.59 years	$	108.58	113,866	$	106.43
$123.87 - 132.84	70,396	1.95 years	132.70		70,396	132.70
$142.67 - 164.35	234,506	4.24 years	152.75		157,566	152.97
	488,560				341,828

Schedule of non-vested stock and restricted stock units

During fiscal 2019, 2018 and 2017, 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):

	2019		2018		2017
Shares granted	78,318		88,127		62,160
Weighted‑average per share price on grant date	$	145.89	$	114.89	$	163.18
Recognized compensation expense	$	8,815	$	6,328	$	5,569