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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
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense $ 2,222 $ 3,078 $ 5,331 $ 6,680
Relative TSR PSU [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 252 855 975 1,788
Time-based restricted stock        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 1,678 2,044 3,813 4,533
Special/Growth PSU        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 97 0 153 0
Common stock [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 195 179 390 359
Cost of sales [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 126 106 258 247
Selling, general and administrative (1) [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 1,443 2,450 3,766 5,184
Research and development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense $ 653 $ 522 $ 1,307 $ 1,249