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STOCK-BASED COMPENSATION - Schedule of Non-Vested Stock and Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 26, 2020 | Dec. 28, 2019 | Dec. 29, 2018
Share-based Payment Arrangement, Option |  |  |
Stock Based Compensation |  |  |
Compensation expense | $ 14,874 | $ 11,587 | $ 10,392
Weighted-average period for grant of stock-based compensation | 2 years 4 months 20 days |  |
Deferred stock-based compensation granted | $ 5,364 |  |
Directors and certain management employees | Non-vested stock and restricted stock units |  |  |
Stock Based Compensation |  |  |
Shares granted | 85,251 | 78,318 | 88,127
Weighted‑average per share price on grant date | $ 161.73 | $ 145.89 | $ 114.89
Compensation expense | $ 9,081 | $ 8,815 | $ 6,328
Weighted-average period for grant of stock-based compensation | 2 years 7 months 28 days |  |
Deferred stock-based compensation granted | $ 22,862 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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