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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
--- | --- | ---
Jun. 27, 2020 | Jun. 29, 2019 | Jun. 27, 2020 | Jun. 29, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | $ 3,725 | $ 3,597 | $ 11,056 | $ 10,772
Relative TSR PSU [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 908 | 1,020 | 2,210 | 3,213
Time-based RSUs |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 2,366 | 2,182 | 7,130 | 6,455
Special/Growth PSUs |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 266 | 173 | 1,087 | 492
Common Stock |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 185 | 222 | 629 | 612
Cost of sales [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 182 | 161 | 597 | 471
Selling, general and administrative (1) [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | 2,676 | 2,616 | 8,106 | 7,871
Research and development [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total equity-based compensation expense | $ 867 | $ 820 | $ 2,353 | $ 2,430

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