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FAIR VALUE MEASUREMENTS (Summary of Financial Assets) (Details) - USD ($) $ in Thousands | Jun. 29, 2018 | Sep. 29, 2017 | Jun. 30, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Rabbi trust assets | $ 16,659 | $ 14,932 | $ 14,071
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Rabbi trust assets | 16,659 | 14,932 | 14,071
Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Rabbi trust assets | 0 | 0 | 0
Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Rabbi trust assets | $ 0 | $ 0 | $ 0

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