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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 | 6 Months Ended
--- | --- | ---
Mar. 28, 2020 | Mar. 29, 2019 | Mar. 28, 2020 | Mar. 29, 2019
Business Acquisition [Line Items] |  |  |  |
Basic (in shares) | 3,500 | 3,475 | 3,499 | 3,475
Diluted (in shares) | 3,500 | 3,475 | 3,499 | 3,475
JB's on the Beach |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Total revenues |  | $ 38,877 |  | $ 82,021
Net income |  | $ (235) |  | $ (210)
Net income per share - basic (in USD per share) |  | $ (0.07) |  | $ (0.06)
Net income per share - diluted (in USD per share) |  | $ (0.07) |  | $ (0.06)
Basic (in shares) |  | 3,475 |  | 3,475
Diluted (in shares) |  | 3,475 |  | 3,475

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