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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. 31, 2016 | Jan. 02, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense | [1] | $ 3,602 | $ 62
Market-based restricted stock [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense |  | 933 | (1,381)
Time-based restricted stock [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense |  | 2,489 | 1,486
Performance-based restricted stock |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense |  | 0 | (43)
Common stock [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense |  | 180 | 0
Cost of sales [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense |  | 141 | 128
Selling, general and administrative (1) [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense | [2] | 2,734 | (770)
Research and development [Member] |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Total equity-based compensation expense |  | $ 727 | 704
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 three months ended January 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 three months ended January 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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