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ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2017
Dec. 25, 2015
Dec. 26, 2014
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period $ (14,013) $ 871  
Current-period other comprehensive income 2,580 (14,884) $ (1,162)
Balance at end of period (11,433) (14,013) 871
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent   3,000  
Foreign currency translation adjustment      
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period (13,514) 848  
Foreign currency translation adjustment, net of tax 1,830 (14,362) (1,281)
Balance at end of period (11,684) (13,514) 848
Unrealized gain (loss) on marketable securities      
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period (499) 23  
Unrealized gain (loss) on investments, net of tax 750 (522) 119
Balance at end of period $ 251 $ (499) $ 23