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STOCK-BASED COMPENSATION (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 25, 2021 | Dec. 26, 2020 | Dec. 28, 2019
Stock Based Compensation |  |  |
Shares of common stock available for issuance | 266,739 |  |
Number of Shares |  |  |
Exercised (in shares) | (169,908) | (147,014) | (119,789)
Share-based Payment Arrangement, Option |  |  |
Stock Based Compensation |  |  |
Compensation expense (included in selling, general and administrative expenses) | $ 28,720 | $ 14,874 | $ 11,587
Tax benefits associated with compensation expense | $ 7,180 | $ 3,719 | $ 2,897
Weighted average period over which unrecognized stock option compensation cost would be recognized | 2 years 4 months 17 days |  |
Unrecognized stock option compensation expense | $ 6,028 |  |
Assumptions used in estimating fair value of each option grant |  |  |
Expected volatility | 33.01% | 33.72% | 33.13%
Risk-free interest rate | 1.26% | 0.43% | 1.69%
Expected life from vesting date | 4 years | 4 years | 3 years
Dividend yield | 1.20% | 1.24% | 1.07%
Number of Shares |  |  |
Balance at the beginning of the period (in shares) | 399,565 | 488,560 | 578,413
Granted (in shares) | 47,223 | 66,231 | 57,648
Exercised (in shares) | (169,908) | (147,014) | (119,789)
Forfeited (in shares) | (416) | (8,212) | (27,712)
Balance at the end of the period (in shares) | 276,464 | 399,565 | 488,560
Options vested or expected to vest (in shares) | 268,338 | 389,633 | 478,575
Options exercisable (in shares) | 154,860 | 254,498 | 341,828
Weighted Average Exercise Price |  |  |
Balance at the beginning of the period (in dollars per share) | $ 141.79 | $ 133.13 | $ 127.74
Granted (in dollars per share) | 252.89 | 168.80 | 147.31
Exercised (in dollars per share) | 135.76 | 125.43 | 113.02
Forfeited (in dollars per share) | 132.84 | 137.49 | 137.07
Balance at the end of the period (in dollars per share) | 164.48 | 141.79 | 133.13
Options vested or expected to vest (in dollars per share) | 163.42 | 141.56 | 133.21
Options exercisable (in dollars per share) | $ 142.15 | $ 138.64 | $ 133.32
Weighted Average Remaining Contractual Term |  |  |
Options outstanding | 5 years 10 months 17 days | 4 years 10 months 17 days | 4 years 14 days
Options vested or expected to vest | 5 years 9 months 18 days | 4 years 9 months 21 days | 3 years 11 months 26 days
Options exercisable | 4 years | 3 years 4 months 17 days | 3 years 2 months 8 days
Aggregate Intrinsic Value |  |  |
Options outstanding | $ 22,586 | $ 12,103 | $ 9,291
Options vested or expected to vest | 22,188 | 11,890 | 9,078
Options exercisable | $ 15,896 | $ 8,510 | $ 6,470
Other option disclosures |  |  |
Weighted average per share fair value of option granted | $ 67.81 | $ 45.49 | $ 37.85
Share-based Payment Arrangement, Option | Maximum |  |  |
Stock Based Compensation |  |  |
Expiration period of grant | 10 years |  |
Share-based Payment Arrangement, Option | Minimum |  |  |
Stock Based Compensation |  |  |
Vesting period of options | 3 years |  |
Expiration period of grant | 7 years |  |
Restricted Stock and Awards |  |  |
Assumptions used in estimating fair value of each option grant |  |  |
Expected life from vesting date | 3 years |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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