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INDEBTEDNESS (Narrative) (Details) - USD ($)
3 Months Ended
Dec. 27, 2019
Sep. 27, 2019
Dec. 28, 2018
Nov. 15, 2017
Debt Instrument [Line Items]        
Debt outstanding $ 0 $ 0 $ 0  
Financial Standby Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding $ 181,000   $ 279,000  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity       $ 125,000,000
Interest rate 2.80%   3.50%  
Revolving Credit Facility | Minimum | LIBOR        
Debt Instrument [Line Items]        
Margin percentage 1.00%      
Revolving Credit Facility | Maximum | LIBOR        
Debt Instrument [Line Items]        
Margin percentage 1.75%      
Revolving Credit Facility | Revolvers Borrowing Capacity Standard        
Debt Instrument [Line Items]        
Maximum borrowing capacity       75,000,000
Accordion feature       $ 50,000,000
Unsecured Revolving Credit Facilities At Foreign Subsidiaries        
Debt Instrument [Line Items]        
Unsecured revolving credit facilities $ 0