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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense $ 5,312 $ 3,401
Time-based RSUs    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 2,896 2,635
Relative TSR PSUs    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 913 1,042
Growth PSUs    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 1,265 (461)
Common Stock    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 238 185
Cost of sales    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 226 205
Selling, general and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense 3,956 2,279
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total equity-based compensation expense $ 1,130 $ 917