INVESTMENTS IN SECURITIES (Details) - USD ($)	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015
Schedule of Available-for-sale Securities [Line Items]
Gross realized gains recognized on available-for-sale securities	$ 900,000	$ 1,200,000
Gross realized losses recognized on available-for-sale securities	83,400	25,400
Cash equivalents, fixed income securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	44,865,000	290,795,000
Fair Value	44,865,000	290,795,000
Cash equivalents, other [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	61,000	54,831,000
Fair Value	$ 61,000	$ 54,831,000