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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. 30, 2017 | Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | $ 3,109 | $ 3,602
Relative TSR PSU [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 723 | 933
Time-based restricted stock |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 2,135 | 2,489
Special/Growth PSU |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 56 | 0
Common stock [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 195 | 180
Cost of sales [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 132 | 141
Selling, general and administrative (1) [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | 2,323 | 2,734
Research and development [Member] |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |
Total equity-based compensation expense | $ 654 | $ 727

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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