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OTHER NON-CURRENT LIABILITIES (Other non-current liabilities) (Details) - USD ($)
$ in Thousands
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Subclassifications of assets, liabilities and equities [abstract]      
Employee benefit obligation - Statutory severance and pre-notice $ 22,075 $ 16,096 $ 14,579
Employee benefit obligation - Defined contribution plan 3,498 3,216  
Provisions 14,343 17,829  
Other non-current liabilities $ 39,916 $ 37,141