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FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands | Sep. 23, 2020 | Dec. 25, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | $ 174,883 | $ 37,099
Total cost basis including Mutual Funds | 191,712 | 73,535
Gross Unrealized Gains | 50 | 72
Gross Unrealized Losses | 0 | 0
Cash and cash equivalents fair value | 174,883 | 37,099
Fair value of marketable securities | 16,879 | 36,508
Fair Value | 191,762 | 73,607
Level 1 | Mutual funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Mutual funds | 16,829 | 36,436
Gross Unrealized Gains | 50 | 72
Gross Unrealized Losses | 0 | 0
Fair value of marketable securities | 16,879 | 36,508
Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 174,883 | 32,094
Cash and cash equivalents fair value | 174,883 | 32,094
Money market funds | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost Basis | 0 | 5,005
Cash and cash equivalents fair value | $ 0 | $ 5,005

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