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FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016 | Dec. 30, 2015
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost Basis | $ 24,750 | $ 21,507 | $ 11,607 | $ 70,849
Cash and cash equivalents fair value | 24,750 | 21,507 |  |
Gross Unrealized Gains | 0 | 2 |  |
Gross Unrealized Losses | (122) | (76) |  |
Fair value of marketable securities | 62,113 | 63,036 |  |
Total cost basis | 86,985 | 84,617 |  |
Total fair value | 86,863 | 84,543 |  |
Level 1: | Mutual Fund |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost Basis | 62,235 | 60,985 |  |
Cash and cash equivalents fair value | 62,113 | 60,924 |  |
Gross Unrealized Gains | 0 |  |  |
Gross Unrealized Losses | (122) | (61) |  |
Fair value of marketable securities | 62,113 | 60,924 |  |
Level 2: | Corporate debt securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Marketable securities cost Basis | 0 | 2,125 |  |
Gross Unrealized Gains | 0 | 2 |  |
Gross Unrealized Losses | 0 | (15) |  |
Fair value of marketable securities | 0 | 2,112 |  |
Cash |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost Basis | 19,746 | 16,138 |  |
Cash and cash equivalents fair value | 19,746 | 16,138 |  |
Money market funds | Level 1: |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Cost Basis | 5,004 | 5,369 |  |
Cash and cash equivalents fair value | $ 5,004 | $ 5,369 |  |

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