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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.

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