FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 27, 2017	Sep. 28, 2016	Sep. 27, 2017	Sep. 28, 2016	Dec. 28, 2016
Fair Value Disclosures [Abstract]
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		$ 37		$ 37		$ 27
Fair value of investments with unrealized losses		25		25		$ 30
Change in net unrealized holding losses	[1]	$ 53	$ (11)	$ 36	$ (19)

[1] Net of tax benefit (expense) of $0 for the thirteen and thirty-nine weeks ended September 27, 2017 and September 28, 2016.