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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Research And Development) (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross amount capitalized related to software development | $ 38,062 | $ 34,528 |
Accumulated amortization | $ 21,788 | 18,040 |
Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life (years) | 4 years |  |
Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life (years) | 15 years |  |
Computer Software, Intangible Asset |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization expense related to capitalized software | $ 3,747 | $ 3,444 | $ 2,738
Computer Software, Intangible Asset | Minimum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life (years) | 3 years |  |
Computer Software, Intangible Asset | Maximum |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Useful life (years) | 7 years |  |

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- Definition Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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