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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 26, 2015
Jun. 27, 2014
Jun. 26, 2015
Jun. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustment, net of tax $ 587 $ 333 $ (825) $ 89
Unrealized gain (loss) on investments, net of tax 387 406 554 453
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period     871  
Current-period other comprehensive income 974 $ 739 (271) [1] $ 542
Balance at end of period 600   600  
Foreign currency translation adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation adjustment, net of tax [1]     (825)  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period     848  
Balance at end of period 23   23  
Unrealized gain (loss) on marketable securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gain (loss) on investments, net of tax [1],[2]     554  
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Balance at beginning of period     23  
Balance at end of period $ 577   $ 577  
[1] The tax impact on foreign currency translation adjustment and unrealized gain on marketable securities was de minimis for the period ending June 26, 2015.
[2] Consists of deferred compensation plan accounts, which include mutual funds.