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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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Jan. 02, 2021 | Dec. 28, 2019
Business Acquisition [Line Items] |  |
Basic (in shares) | 3,502 | 3,499
Diluted (in shares) | 3,502 | 3,541
Blue Moon Fish Company |  |
Business Acquisition [Line Items] |  |
Total revenues | $ 20,976 | $ 45,050
Net income | $ (728) | $ 1,857
Net income per share - basic (in USD per share) | $ (0.21) | $ 0.53
Net income per share - diluted (in USD per share) | $ (0.21) | $ 0.52
Basic (in shares) | 3,502 | 3,499
Diluted (in shares) | 3,502 | 3,541

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