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FAIR VALUE MEASUREMENTS (Summary of Financial Assets) (Details) - USD ($)
$ in Thousands
Jan. 01, 2021
Oct. 02, 2020
Dec. 27, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Rabbi trust assets $ 25,032 $ 21,550 $ 20,978
Level 1      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Rabbi trust assets 25,032 21,550 20,978
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