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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Dec. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Total accumulated other comprehensive loss $ (41,402) $ (38,908) $ (41,402) $ (38,908) $ (35,634)
Foreign currency translation adjustments 3,643 (2,347) (5,768) 3,431  
Cumulative Foreign Currency Translation Adjustments [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Total accumulated other comprehensive loss (32,290) (29,533) (32,290) (29,533) (26,522)
Pension and Post-retirement Liability Adjustment [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Total accumulated other comprehensive loss $ (9,112) $ (9,375) (9,112) (9,375) (9,112)
Tax impact     $ 2,800 $ 2,900 $ 2,800