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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 25, 2021
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 2021, 2020 and 2019 was estimated using the following assumptions:
202120202019
Expected volatility
33.01 %33.72 %33.13 %
Risk-free interest rate
1.26 %0.43 %1.69 %
Expected life from vesting date
4.0 yrs
4.0 yrs
3.0 yrs
Dividend yield
1.20 %1.24 %1.07 %
Summary of Activity of Stock Plans
Following is a summary of the stock option activity during 2019, 2020 and 2021:
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.
Number of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Outstanding at December 26, 2020399,565 $141.79 
Granted
47,223 252.89 
Exercised
(169,908)135.76 
Forfeited
(416)132.84 
Outstanding at December 25, 2021276,464 $164.48 5.88$22,586 
Options vested or expected to vest at December 25, 2021268,338 $163.42 5.8022,188 
Options exercisable at December 25, 2021154,860 $142.15 4.0015,896 
The weighted average per share fair value of options granted during 2021 was $67.81.
Schedule of Non-Vested Stock and Restricted Stock Units During fiscal 2021, 2020 and 2019, 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):
202120202019
Shares granted
216,971 85,251 78,318 
Weighted‑average per share price on grant date
$236.28 $161.73 $145.89 
Recognized compensation expense
$16,147 $9,081 $8,815 
During the second half of 2021, the Company granted 159,982 restricted shares, worth $36,916, to certain employees of Prospera. These restricted shares vest in equal installments over four years, and require the employees to continue employment over those four years. As such, the related compensation expense will be incurred over the vesting period.
At December 25, 2021 the amount of deferred stock‑based compensation granted, to be recognized over a weighted‑average period of 3.21 years, was approximately $55,838.
Share-based Payment Arrangement, Performance Shares, Outstanding Activity During fiscal 2021, 2020 and 2019, the Company granted PSU awards as follows (which are not included in the above stock plan activity tables):
202120202019
Shares granted
41,060 35,181 31,344 
Weighted‑average per share price on grant date
$230.40 $125.41 $136.14 
Recognized compensation expense
$10,035 $3,165 $—