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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (New Accounting Pronouncements) (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2017 | Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating expenses |  | $ (165,349) | $ (153,568) | $ (153,880)
Other expenses |  | $ (3,060) | $ (1,407) | $ 1,299
Accounting Standards Update 2017-07 | Forecast |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating expenses | $ 500 |  |  |
Other expenses | $ 500 |  |  |

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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