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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. 01, 2017
Apr. 02, 2016
Apr. 01, 2017
Apr. 02, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense [1] $ 3,078 $ 1,973 $ 6,680 $ 2,035
Market-based restricted stock [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 855 388 1,788 (993)
Time-based restricted stock [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 2,044 1,226 4,533 2,712
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 179 359 359 359
Cost of sales [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense 106 97 247 225
Selling, general and administrative (1) [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense [2] 2,450 1,460 5,184 690
Research and development [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total equity-based compensation expense $ 522 $ 416 $ 1,249 1,120
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 six months ended April 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 six months ended April 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.