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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
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:
202020192018
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, 2017570,622 $128.34 
Granted
105,135 112.08 
Exercised
(63,717)106.26 
Forfeited
(33,627)129.52 
Outstanding at December 29, 2018578,413 $127.74 4.35$909 
Options vested or expected to vest at December 29, 2018565,592 $127.84 4.30909 
Options exercisable at December 29, 2018405,128 $126.61 3.47909 
    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, 2018578,413 $127.74 
Granted
57,648 147.31 
Exercised
(119,789)113.02 
Forfeited
(27,712)137.07 
Outstanding at December 28, 2019488,560 $133.13 4.04$9,291 
Options vested or expected to vest at December 28, 2019478,575 $133.21 3.999,078 
Options exercisable at December 28, 2019341,828 $133.32 3.196,470 

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, 2019488,560 $133.13 
Granted
66,231 168.80 
Exercised
(147,014)125.43 
Forfeited
(8,212)137.49 
Outstanding at December 26, 2020399,565 $141.79 4.88$12,103 
Options vested or expected to vest at December 26, 2020389,633 $141.56 4.8111,890 
Options exercisable at December 26, 2020254,498 $138.64 3.388,510 
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 OutstandingOptions Exercisable
Exercise Price
Range		NumberWeighted
Average
Remaining
Contractual
Life		Weighted
Average
Exercise
Price		NumberWeighted
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 years132.48 26,282 132.48 
$142.67 - 168.80
253,089 5.71 years158.05 148,420 156.04 
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):
202020192018
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