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SHAREHOLDERS’ EQUITY - Nonvested Option Activity (Details) - Stock options - $ / shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 27, 2019 | Dec. 28, 2018 | Dec. 29, 2017
Nonvested Options |  |  |
Nonvested outstanding (in shares) | 414 | 547 | 653
Granted (in shares) |  | 158 | 199
Vested (in shares) | (242) | (263) | (273)
Forfeited (in shares) | (6) | (28) | (32)
Nonvested outstanding (in shares) | 166 | 414 | 547
Nonvested Options, Weighted Average Grant-Date Fair Value |  |  |
Nonvested (in dollars per share) | $ 8.69 | $ 6.43 | $ 4.75
Granted (in dollars per share) |  | 12.73 | 12.23
Vested (in dollars per share) | 9.43 | 7.29 | 6.68
Forfeited (in dollars per share) | 10.87 | 5.07 | 15.65
Nonvested (in dollars per share) | $ 12.15 | $ 8.69 | $ 6.43

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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Number of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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