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FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 01, 2016 | Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment losses |  | $ 0 | $ 6,197,000 | $ 0
Goodwill |  | 11,238,000 | 11,196,000 | 14,292,000
Assets, fair value disclosure, nonrecurring |  | 0 |  |
Liabilities, fair value disclosure, nonrecurring |  | 0 |  |
Diving |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Impairment losses | $ 6,197,000 |  | 6,197,000 |
Goodwill |  | $ 0 | $ 0 | $ 3,925,000

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