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PENSION PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 29, 2017
Dec. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating expenses $ 41,774 $ 36,093
Components of net periodic benefit cost:    
Service cost 0 0
Interest on projected benefit obligation 261 284
Less estimated return on plan assets 298 274
Amortization of unrecognized losses 182 142
Net periodic benefit cost 145 $ 152
Accounting Standards Update 2017-07    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating expenses (145)  
Other expenses $ 145