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FAIR VALUE MEASUREMENTS FAIR VALUE MEASUREMENTS - Unrealized Loss on Investments (Details) - USD ($)
$ in Thousands
Sep. 27, 2017
Dec. 28, 2016
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,638 $ 1,244
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (25) (30)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (9) (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 322 540
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (16) (20)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,960 1,784
Corporate debt securities    
Gain (Loss) on Investments [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 1,638 1,244
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss (25) (30)
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (9) (10)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 322 540
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss (16) (20)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 1,960 $ 1,784