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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Foreign Operations And Related Derivative Financial Instruments) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Oct. 02, 2015
Foreign Currencies [Line Items]      
Currency gains from transactions $ 903 $ 277  
Currency losses from transactions     $ 1,196
Percent of revenues in foreign currency 17.00%    
Euro      
Foreign Currencies [Line Items]      
Percent of revenues in foreign currency 7.00%    
Canadian Dollars      
Foreign Currencies [Line Items]      
Percent of revenues in foreign currency 6.00%    
Various other foreign currencies      
Foreign Currencies [Line Items]      
Percent of revenues in foreign currency 4.00%