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SHAREHOLDERS' EQUITY AND EMPLOYEE BENEFIT PLANS (Total equity-based compensation expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 03, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense (reversal) | $ 15,019 | $ 14,332 | $ 11,685
Market-based restricted stock [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense (reversal) | 3,266 | 4,220 | 3,583
Time-based restricted stock [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense (reversal) | 9,519 | 8,603 | 7,027
Stock options [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense (reversal) | 1,384 | 675 | 295
Common Stock |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense (reversal) | 850 | 834 | 780
Cost of sales [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense (reversal) | 744 | 632 | 515
Selling, general and administrative (1) [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense (reversal) | 11,071 | 10,503 | 8,548
Research and development [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense (reversal) | $ 3,204 | $ 3,197 | $ 2,622

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