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FAIR VALUE MEASUREMENTS (Effect of Changes in Financial Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 29, 2017 | Dec. 30, 2016
Rabbi trust assets |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Changes in fair value, loss (income) | $ (528) | $ 202

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