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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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Cash, Cash Equivalents, and Available-for-sale Debt Securities

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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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