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MARKETABLE SECURITIES - Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 27, 2014
Dec. 27, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 9,500 $ 20,750
Fair Value 9,496 20,650
Certificates of deposit
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 9,500 10,000
Fair Value 9,496 9,900
Variable-rate demand notes
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0 5,750
Fair Value 0 5,750
Commercial paper
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 0 5,000
Fair Value $ 0 $ 5,000