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RECENT RESTAURANT EXPANSION AND OTHER DEVELOPMENTS - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018
Business Acquisition [Line Items] |  |
Basic (in shares) | 3,499 | 3,474
Diluted (in shares) | 3,541 | 3,474
JB's on the Beach |  |
Business Acquisition [Line Items] |  |
Total revenues |  | $ 43,144
Net income |  | $ 24
Net income per share - basic (in USD per share) |  | $ 0.01
Net income per share - diluted (in USD per share) |  | $ 0.01
Basic (in shares) |  | 3,474
Diluted (in shares) |  | 3,539

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