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PENSION PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating expenses $ 47,378 $ 45,893 $ 137,345 $ 126,441
Pension plan contributions 47 1,043 5,140 1,308
Components of net periodic benefit cost:        
Service cost 0 0 0 0
Interest on projected benefit obligation 272 215 794 783
Less estimated return on plan assets (25) 347 572 895
Amortization of unrecognized losses 50 265 415 548
Net periodic benefit cost 347 $ 133 637 $ 436
Accounting Standards Update 2017-07        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating expenses (347)   (637)  
Other expenses $ 347   $ 637