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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense $ 3,401 $ 3,609
Relative TSR PSU [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 1,042 406
Time-based RSUs    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 2,635 2,415
Special/Growth PSUs    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense (461) 566
Common Stock    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 185 222
Cost of sales [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 205 232
Selling, general and administrative (1) [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 2,279 2,735
Research and development [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense $ 917 $ 642