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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (New Accounting Pronouncements) (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 28, 2018
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reduction of operating expenses   $ (193,923) $ (185,982) $ (178,839)
Increase in other expenses   $ 1,362 $ 796 $ 4,122
Accounting Standards Update 2017-07        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reduction of operating expenses $ 848      
Increase in other expenses $ 848