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FAIR VALUE MEASUREMENTS - Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
 12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Dec. 25, 2013
Dec. 26, 2012
Schedule of Available-for-sale Securities [Line Items]          
Gross proceeds from sales and redemptions $ 938,000 $ 0 $ 0    
Dividend income 296,000 0 0    
Interest income 88,000 7,000 0    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,244,000 2,397,000      
Cash cost basis 11,607,000 70,849,000   $ 2,677,000 $ 13,076,000
Cash and cash equivalents fair value 11,607,000 70,849,000      
Gross Unrealized Gains 3,000 1,000      
Gross Unrealized Losses (30,000) (12,000)      
Fair value of marketable securities 62,678,000 2,386,000      
Total cost basis 74,312,000 73,246,000      
Total fair value 74,285,000 73,235,000      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10,000) (12,000)      
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 540,000 0      
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (20,000) 0      
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,784,000 2,397,000      
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (30,000) (12,000)      
Marketable Securities, Realized Gain (Loss) (7,000) 0 0    
Available-for-sale Securities, Gross Realized Gain (Loss) 377,000 7,000 0    
Available-for-sale Securities, Amortized Cost Basis, Securities Sold 956,000        
Available-for-sale Securities, Gross Realized Gains 2,000        
Available-for-sale Securities, Gross Realized Losses (20,000)        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax [1] 19,000 0 $ 0    
Corporate debt securities          
Schedule of Available-for-sale Securities [Line Items]          
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,244,000 2,397,000      
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10,000) (12,000)      
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 540,000 0      
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (20,000) 0      
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,784,000 2,397,000      
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (30,000) (12,000)      
Fair Value, Inputs, Level 1 | Mutual Fund          
Schedule of Available-for-sale Securities [Line Items]          
Cash cost basis 60,232,000        
Fair value of marketable securities 60,232,000        
Fair Value, Inputs, Level 2 | Corporate debt securities          
Schedule of Available-for-sale Securities [Line Items]          
Marketable securities cost Basis 2,473,000 2,397,000      
Gross Unrealized Gains 3,000 1,000      
Gross Unrealized Losses (30,000) (12,000)      
Fair value of marketable securities 2,446,000 2,386,000      
Cash          
Schedule of Available-for-sale Securities [Line Items]          
Cash cost basis 6,322,000 70,816,000      
Cash and cash equivalents fair value 6,322,000 70,816,000      
Money market funds | Fair Value, Inputs, Level 1          
Schedule of Available-for-sale Securities [Line Items]          
Cash cost basis 5,285,000 33,000      
Cash and cash equivalents fair value $ 5,285,000 $ 33,000      
[1] Net of tax benefit of $0 for fiscal years ended December 28, 2016, December 30, 2015 and December 31, 2014.