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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2017
Jun. 24, 2016
Jul. 02, 2017
Jun. 24, 2016
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period $ (8,896) $ (11,536) $ (11,433) $ (14,013)
Current-period other comprehensive income 449 (221) 2,986 2,256
Balance at end of period (8,447) (11,757) (8,447) (11,757)
Foreign currency translation adjustment        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period (9,884) (11,113) (11,684) (13,514)
Foreign currency translation adjustment, net of tax 540 (307) 2,340 2,094
Balance at end of period (9,344) (11,420) (9,344) (11,420)
Unrealized gain (loss) on marketable securities        
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]        
Balance at beginning of period 988 (423) 251 (499)
Unrealized gain (loss) on investments, net of tax (91) 86 646 162
Balance at end of period $ 897 $ (337) $ 897 $ (337)