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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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Cash, Cash Equivalents, and Available-for-sale Debt and Equity Securities, Amortized Cost

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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