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ACCUMULATED OTHER COMPREHENSIVE LOSS - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period $ (14,649) $ (6,804)  
Foreign currency translation adjustment 1,411 (6,320) $ 3,355
Unrealized gain on investments, net of tax 0 0 1,274
Total other comprehensive income (loss), net of tax 1,411 (6,320) 4,629
Change in accounting standard cumulative-effect adjustment 0    
Balance at end of period (13,238) (14,649) (6,804)
Foreign currency translation adjustment      
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period (14,649) (8,329)  
Foreign currency translation adjustment 1,411 (6,320)  
Change in accounting standard cumulative-effect adjustment 0 0  
Balance at end of period (13,238) (14,649) (8,329)
Unrealized gain on investments      
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Balance at beginning of period 0 1,525  
Unrealized gain on investments, net of tax 0 0  
Change in accounting standard cumulative-effect adjustment 0 (1,525)  
Balance at end of period 0 0 1,525
Total other comprehensive loss      
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Total other comprehensive income (loss), net of tax $ 1,411 (6,320) $ 4,629
Change in accounting standard cumulative-effect adjustment   (1,525)  
Retained earnings      
Accumulated Other Comprehensive Loss, Net of Tax [Roll Forward]      
Change in accounting standard cumulative-effect adjustment   $ 1,525