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INDEBTEDNESS (Narrative) (Details) - USD ($)
3 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Nov. 15, 2017
Sep. 29, 2017
Financial Standby Letter of Credit        
Debt Instrument [Line Items]        
Letters of credit outstanding $ 279,000     $ 279,000
Revolving Credit Facility        
Debt Instrument [Line Items]        
Maximum borrowing capacity     $ 125,000,000  
Interest rate 3.50% 2.50%    
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 $ 0