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OTHER NON-CURRENT LIABILITIES (Statutory severance and pre-notice obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2019
Dec. 30, 2018
Changes in net defined benefit liability (asset) [abstract]    
Obligation, beginning of fiscal year $ 22,075 $ 16,096
Service cost 14,226 13,500
Interest cost 6,798 6,478
Actuarial loss 1,296 1,694
Foreign exchange gain (584) (537)
Benefits paid (16,044) (15,156)
Obligation, end of fiscal year $ 27,767 $ 22,075