STOCK-BASED COMPENSATION (Tables)

12 Months Ended

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