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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 02, 2016 | Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | $ 11,685 | $ 11,722 | [1] | $ 5,730
Market-based restricted stock [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | 3,583 | 3,480 |  | (33)
Time-based restricted stock [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | 7,027 | 7,492 |  | 5,255
Performance-based restricted stock |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | 0 | 0 |  | (43)
Stock options [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | 295 | 0 |  | 0
Common Stock |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | 780 | 750 |  | 551
Cost of sales [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | 515 | 463 |  | 421
Selling, general and administrative (1) [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | 8,548 | 9,015 | [2] | 3,244
Selling, general and administrative (1) [Member] | Forfeiture of Stock Awards [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) | $ (2,000) |  |  |  |
Research and development [Member] |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |
Total equity-based compensation expense (reversal) |  | $ 2,622 | $ 2,244 |  | $ 2,065
[1] | The equity-based compensation expense for fiscal 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 fiscal 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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