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INCOME TAXES - Summary of Income Tax Contingencies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2019 | Sep. 29, 2018
Income Tax Disclosure [Abstract] |  |
Balance at beginning of year | $ 110 | $ 152
Additions based on tax positions taken in current and prior years | 407 | 125
Settlements | (205) | (167)
Lapse in statute of limitations | (109) | 0
Decreases based on tax positions taken in prior years | (45) | 0
Balance at end of year | $ 158 | $ 110

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