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OTHER NON-CURRENT LIABILITIES (Statutory severance and pre-notice obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Changes in net defined benefit liability (asset) [abstract]    
Obligation, beginning of fiscal year $ 16,096 $ 14,579
Service cost 13,500 12,424
Interest cost 6,478 6,171
Actuarial loss 1,694 64
Foreign exchange gain (537) (389)
Benefits paid (15,156) (16,753)
Obligation, end of fiscal year $ 22,075 $ 16,096