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PENSION PLANS (Narrative) (Details)
$ in Thousands
3 Months Ended
Oct. 01, 2021
USD ($)
Jan. 01, 2021
USD ($)
plan
Dec. 27, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Non-contributory defined benefit pension plans | plan   2  
Pension plan contributions   $ 43 $ 44
Minimum | Forecast      
Defined Benefit Plan Disclosure [Line Items]      
Plan termination expense $ 4,000    
Maximum | Forecast      
Defined Benefit Plan Disclosure [Line Items]      
Plan termination expense $ 5,000