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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | $ 3,609 | $ 3,873
Relative TSR PSU [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 406 | 1,375
Time-based RSUs |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 2,415 | 2,141
Special/Growth PSUs |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 566 | 162
Common Stock |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 222 | 195
Cost of sales [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 232 | 150
Selling, general and administrative (1) [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 2,735 | 2,925
Research and development [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | $ 642 | $ 798

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