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FAIR VALUE MEASUREMENTS (Summary of Financial Assets) (Details) - USD ($)
$ in Thousands
Jun. 28, 2020
Sep. 27, 2019
Jun. 28, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Rabbi trust assets $ 19,493 $ 19,092 $ 18,981
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Rabbi trust assets 19,493 19,092 18,981
Level 2      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Rabbi trust assets 0 0 0
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Rabbi trust assets $ 0 $ 0 $ 0