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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Dec. 25, 2015
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period $ (11,433) $ (14,013)  
Current-period other comprehensive income 4,629 2,580 $ (14,884)
Balance at end of period (6,804) (11,433) (14,013)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax 500    
Foreign currency translation adjustment      
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period (11,684) (13,514)  
Foreign currency translation adjustment, net of tax 3,355 1,830 (14,362)
Balance at end of period (8,329) (11,684) (13,514)
Unrealized gain (loss) on investments      
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period 251 (499)  
Unrealized gain (loss) on investments, net of tax 1,274 750 (522)
Balance at end of period $ 1,525 $ 251 $ (499)