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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense [1] $ 2,790 $ 1,901 $ 9,470 $ 3,936
Market-based restricted stock [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 838 475 2,626 (518)
Time-based restricted stock [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 1,756 1,246 6,289 3,958
Performance-based restricted stock        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 0 0 0 (43)
Common stock [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 196 180 555 539
Cost of sales [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 97 98 344 323
Selling, general and administrative (1) [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense [2] 2,179 1,331 7,363 2,021
Research and development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense $ 514 $ 472 $ 1,763 1,592
Forfeiture of Stock Awards [Member] | Selling, general and administrative (1) [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense [2]       $ (2,000)
[1] The equity-based compensation expense for the nine months ended July 2, 2016, includes the reversal of a $2.0 million expense due to the forfeiture of stock awards in connection with the October 2015 retirement of the Company's CEO.
[2] The selling, general and administrative expense for the nine months ended July 2, 2016, includes the reversal of a $2.0 million expense due to the forfeiture of stock awards in connection with the October 2015 retirement of the Company's CEO.