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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. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 121,877 | $ 63,810 | $ 87,294 | $ 69,159
Operating expenses |  | (178,839) | (165,349) | (153,568) |
Other expenses |  | (4,122) | $ (3,060) | $ (1,407) |
Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating expenses | $ 848 |  |  |  |
Other expenses | $ 848 |  |  |  |
Foreign |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 40,999 |  |  |

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