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FAIR VALUE MEASUREMENTS - Schedule of Income for AFS Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Fair Value Disclosures [Abstract]
Dividend income	$ 359	$ 1,244	$ 1,392
Interest income	0	0	9
Realized gain (loss) on sale of investments	79	22	(3)
Unrealized gain (loss) on equity securities	(59)	194	(61)
Total	$ 379	$ 1,460	$ 1,337

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