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SHAREHOLDERS’ EQUITY - Restricted Stock Activity (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
2008 Plan |  |  |
Weighted-Average Grant Date Fair Value |  |  |
Outstanding (in dollars per share) | $ 21.94 |  |
Awarded (in dollars per share) | 28.99 | $ 21.94 |
Vested (in dollars per share) | 21.94 |  |
Forfeited (in dollars per share) | 27.28 |  |
Outstanding (in dollars per share) | $ 27.28 | $ 21.94 |
Stock options |  |  |
Unrecognized compensation expense |  |  |
Unrecognized compensation expense related to non-vested stock options (in dollars) | $ 1,489,000 | $ 3,598,000 | $ 3,514,000
Awards granted that were immediately vested (in shares) | 0 | 0 | 0
Restricted stock |  |  |
Unrecognized compensation expense |  |  |
Unrecognized compensation expense related to non-vested stock other than options (in dollars) | $ 1,502,000 | $ 1,012,000 | $ 1,162,000
Restricted stock | 2008 Plan |  |  |
Restricted Stock |  |  |
Outstanding (in shares) | 64,000 | 87,000 | 99,000
Awarded (in shares) | 37,000 | 22,000 | 28,000
Vested (in shares) | (43,000) | (45,000) | (40,000)
Outstanding (in shares) | 58,000 | 64,000 | 87,000
Weighted-Average Grant Date Fair Value |  |  |
Outstanding (in dollars per share) | $ 22.28 | $ 17.67 | $ 11.37
Awarded (in dollars per share) | 35.60 | 28.17 | 31.53
Vested (in dollars per share) | 18.90 | 16.09 | 33.02
Outstanding (in dollars per share) | $ 33.33 | $ 22.28 | $ 17.67
Performance Shares |  |  |
Unrecognized compensation expense |  |  |
Unrecognized compensation expense related to non-vested stock other than options (in dollars) | $ 21,515,000 | $ 12,254,000 | $ 0
Weighted-average period over which unrecognized expense is expected to be recognized | 1 year 26 days |  |
Performance Shares | 2008 Plan |  |  |
Restricted Stock |  |  |
Outstanding (in shares) | 280,000 |  |
Awarded (in shares) | 329,000 | 280,000 |
Vested (in shares) | (175,000) |  |
Forfeited (in shares) | (3,000) |  |
Outstanding (in shares) | 431,000 | 280,000 |

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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=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for option under share-based payment arrangement. + 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=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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