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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense $ 3,109 $ 3,602
Relative TSR PSU [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 723 933
Time-based restricted stock    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 2,135 2,489
Special/Growth PSU    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 56 0
Common stock [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 195 180
Cost of sales [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 132 141
Selling, general and administrative (1) [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 2,323 2,734
Research and development [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense $ 654 $ 727