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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Apr. 03, 2021
Mar. 28, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense $ 3,963 $ 3,722 $ 7,364 $ 7,331
Relative TSR PSU [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 989 896 2,031 1,302
Time-based RSUs        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 2,566 2,349 5,201 4,764
Growth PSUs        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 223 255 (238) 821
Common Stock        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 185 222 370 444
Cost of sales [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 210 183 415 415
Selling, general and administrative (1) [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 2,824 2,695 5,103 5,430
Research and development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense $ 929 $ 844 $ 1,846 $ 1,486